Introduction

Do you want to see objects in the dark, like having a pair of cat eyes? Do you want to do various fun and exciting activities at night, such as hunting, observing, camping, rescue, etc.? If your answer is yes, then you may need a pair of night vision goggles. Night vision goggles are devices that can see objects in the dark or low-light conditions, they can give you a wider view and a higher sense of security at night. But do you know how to choose and use night vision goggles? In this article, we will introduce you to ten things about night vision goggles, including their types, working principles, quality indicators, advantages and disadvantages, range, price, etc. We hope this article can help you better understand and use night vision goggles, and make your night activities more wonderful and memorable.

1.   What are night vision goggles and why would I want them?

Have you ever had such an experience, when you walk on the road at night, or camp in the wild, you suddenly hear some strange sounds, or see some blurry shadows, you want to know what they are, but you can’t see clearly? Or have you ever had such an idea, if you could see as clearly in the dark as in the daytime, then you could do a lot of fun and exciting things, such as hunting, observing, shooting, rescue, etc.? If you have had such experiences or ideas, then you may need a pair of night vision goggles.

Night vision goggles are devices that can see objects in the dark or low-light conditions, they can give you a wider view and a higher sense of security at night. Night vision goggles were originally invented for military purposes, but now they are widely used in civilian fields, such as hunting, observing, camping, rescue, security, etc. Night vision goggles can let you see some things that you can’t normally see, such as animals, plants, stars, etc., and also help you cope and deal with dangerous or urgent situations better. Night vision goggles can bring you a lot of fun and convenience, but you also need to know how to choose and use them correctly.

2.   What type of night vision goggles do I want?

Night vision goggles have different types, mainly divided into four generations. Each generation has different performance and price, generally speaking, the higher the generation, the clearer and farther the view, but also the more expensive. You need to choose the appropriate type according to your needs and budget.

First generation: This is the earliest and cheapest type of night vision goggles. They use a device called a photomultiplier tube that can amplify weak light hundreds of times and let you see a green image. The advantages of first-generation night vision goggles are low price and suitable for general entertainment or observation purposes. The disadvantages of first-generation night vision goggles are low resolution, short range, high noise, high distortion, and they require a certain degree of ambient light to work. If the light is too dim, they will fail or not be able to see clearly. The price of first-generation night vision goggles is about 1000 yuan.

Second generation: This is a more common and practical type of night vision goggles. They use a device called a microchannel plate that can amplify weak light thousands of times and let you see a clearer and brighter image. The advantages of second-generation night vision goggles are high resolution, long range, low noise, low distortion, and they can work in darker environments. They can even work with a device called an infrared illuminator, which can make objects visible in complete darkness. The disadvantages of second-generation night vision goggles are high price, heavy weight, high maintenance cost. The price of second-generation night vision goggles is about 5000 yuan.

Third generation: This is the most advanced and expensive type of night vision goggles. They use a device called a low-light enhancer that can amplify extremely weak light (such as cosmic rays) tens of thousands of times and let you see a very clear and bright image. The advantages of third generation night vision goggles are very high resolution, very long range, very low noise, very low distortion, and they can work in complete darkness without any additional illuminator. The disadvantages of third generation night vision goggles are very high price, very heavy weight, very high maintenance cost. The price of third and fourth generation night vision goggles is more than 10,000 yuan.

Fourth generation: This is the newest and rarest type of night vision goggles. They use a device called an electronic enhancer or electronic converter (ECC) that can convert weak or imperceptible light (such as infrared or ultraviolet) into visible light and amplify it hundreds of thousands of times, letting you see a super clear and super bright (even color) image. The advantages of fourth generation night vision goggles are extremely high resolution, extremely long range, extremely low noise, extremely low distortion, and they can work in any light condition, even see some things that you can’t normally see, such as heat, electromagnetic waves, etc. The disadvantages of fourth generation night vision goggles are extremely high price, extremely heavy weight, extremely high maintenance cost, and they are very rare and hard to obtain.

You can choose the type of night vision goggles you want according to your needs and budget, but you also need to pay attention to some things. First, you need to know that different types of night vision goggles have different legal restrictions and regulations. You need to comply with the relevant laws and regulations, otherwise you may face the risk of fines or confiscation. Second, you need to know that different types of night vision goggles have different usage methods and precautions. You need to follow the instructions or professional guidance to use and maintain your night vision goggles correctly, otherwise you may damage your night vision goggles or hurt your eyes. Finally, you need to know that different types of night vision goggles have different brands and quality. You need to choose a reputable and quality-assured brand and supplier, otherwise you may buy some fake or inferior products.

3.   What do I want to do with night vision goggles?

What do you want to do with night vision goggles? This is a very important question, because different purposes may require different functions and specifications. You need to choose the night vision goggles that suit you according to your interests and goals. Here are some common uses and suggestions for night vision goggles:

Hunting: If you are a hunting enthusiast, you may want to use night vision goggles to increase your hunting range and opportunities, because many animals are active at night, such as wild boars, deer, foxes, etc. You need a night vision device that can work with a scope or an infrared laser, so that you can accurately lock and shoot the target. You also need a night vision device that can automatically adjust the brightness and contrast in different light conditions, so that you can see clearly at any time. You also need a night vision device that can resist strong light or electromagnetic interference, so that you will not lose the target because of accidental flashes or signals. For hunting purposes, we recommend that you choose second or third generation night vision goggles, they can provide enough clarity and distance, and they can be compatible with various accessories.

Observation: If you are a person who likes to observe nature or culture, you may want to use night vision goggles to discover some things that you can’t normally see, such as animals, plants, stars, buildings, etc. You need a night vision device that can adjust the focus and magnification, so that you can adjust the best angle and detail according to what you want to see. You also need a night vision device that can take pictures or videos, so that you can save or share what you see with others. You also need a night vision device that can display color or black and white images, so that you can choose the most suitable mode according to your preferences and needs. For observation purposes, we recommend that you choose third or fourth generation night vision goggles, they can provide very high resolution and color, and they can have many advanced features.

Camping: If you are a person who likes camping or adventure, you may want to use night vision goggles to increase your sense of security and fun, because camping often involves walking or staying in the dark, such as in forests, caves, deserts, etc. You need a night vision device that can be used as a head-mounted or handheld device, so that you can choose the most suitable way according to your convenience and comfort. You also need a night vision device that can work in complete darkness, so that you don’t have to worry about the lack of ambient light or battery exhaustion. You also need a night vision device that is durable and waterproof, so that you don’t have to worry about them being broken or wet. For camping purposes, we recommend that you choose first- or second-generation night vision goggles, they can provide enough brightness and field of view, and they can adapt to various environments and conditions.

Rescue: If you are a person who is engaged in rescue or emergency tasks, you may want to use night vision goggles to improve your efficiency and success rate, because rescue often involves working in dark or complex situations, such as in fires, earthquakes, floods, etc. You need a night vision device that can work with radio or navigation systems, so that you can keep in touch and locate with your companions or command center. You also need a night vision device that can see some things that you can’t normally see, such as heat, electromagnetic waves, chemical substances, etc., so that you can better detect and judge dangers and targets. You also need a night vision device that can be quickly turned on and off, so that you can switch visual modes according to different situations. For rescue purposes, we recommend that you choose fourth or third generation night vision goggles, they can provide very high performance and flexibility, and they can cope with various emergency and dangerous situations.

These are some common uses and suggestions for night vision goggles. Of course, you can also choose other uses and types according to your own interests and goals. No matter what you want to do with night vision goggles, we hope that you can find the most suitable one’s for you and enjoy the fun and convenience they bring to you.

4.   Do I want to use a handheld or head-mounted night vision device?

Do you want to use a handheld or head-mounted night vision device? This is a very practical question, because different ways may affect your user experience and effect. You need to choose the most suitable way according to your convenience and comfort. Here are some features and comparisons of handheld and head-mounted night vision devices:

Handheld: This is a relatively light and portable night vision device way, they are like a telescope or camera, you can hold them in your hand or put them on a tripod, and then observe objects through a small window or screen. The advantages of handheld night vision devices are light weight, simple operation, can be picked up or put down at any time, without affecting your normal vision or activity. The disadvantages of handheld night vision devices are that they are more troublesome to use, need to be held in your hand or fixed in a certain position, cannot move or rotate with you, and can only see a limited field of view, cannot see the surrounding environment.

Head-mounted: This is a more complex and advanced night vision device way, they are like glasses or helmets, you can fix them on helmets or hats, and then observe objects through a large window or screen. The advantages of head-mounted night vision devices are heavy weight, complex operation, can move or rotate with you, do not need to hold them in your hand or fix them in a certain position, and can see a wider field of view, can see the surrounding environment. The disadvantages of head-mounted night vision devices are heavy weight, low comfort, may affect your normal vision or activity, and need extra power or batteries to power.

You can choose the night vision device way you want according to your needs and preferences, but you also need to pay attention to some things. First, you need to know that different ways of night vision devices have different models and specifications, you need to choose a night vision device that suits your head shape and size, otherwise you may feel uncomfortable or see unclearly. Second, you need to know that different ways of night vision devices have different safety risks, you need to follow the relevant safety rules and precautions, otherwise you may be injured by accidental collisions or strong light stimulation. Finally, you need to know that different ways of night vision devices have different usage occasions, you need to choose the most suitable way according to different environments and conditions, otherwise you may affect your effect due to unsuitability or inconvenience.

5.   How do night vision devices work?

Are you curious about how night vision devices let you see objects in the dark? Night vision devices are devices that use physical and electronic technology to amplify weak light, and they can let you see a green or black and white image. The working principle of night vision devices is actually not complicated, they are mainly composed of the following parts:

Objective lens: This is the front end of the night vision device, its function is to collect the weak light in the environment, such as moonlight or starlight, and focus it on a small point. The size and shape of the objective lens determine the field of view and magnification of the night vision device.

Photoelectric converter: This is the core of the night vision device, its function is to convert the collected weak light into an electronic signal, and amplify it by hundreds or thousands of times. The type and quality of the photoelectric converter determine the performance and generation of the night vision device.

Fluorescent screen: This is the back end of the night vision device, its function is to convert the amplified electronic signal back into visible light, and display it on a small screen. The color and brightness of the fluorescent screen determine the image quality and mode of the night vision device.

According to different generations of night vision devices, photoelectric converters have different types and working modes, here are some common photoelectric converters:

Photomultiplier tube: This is the photoelectric converter used by first-generation night vision devices, it is a vacuum tube, inside which there is a cathode and an anode, as well as a series of metal plates called dynodes. When weak light enters the photomultiplier tube from the objective lens, it hits the cathode, causing it to release some electrons. These electrons are accelerated and hit the first dynode, causing it to release more electrons. These electrons are then accelerated and hit the second dynode, causing it to release more and more electrons. This repeats until the last dynode releases hundreds or thousands of times more electrons. These electrons are finally collected on the anode and output as an amplified electronic signal.

Microchannel plate: This is the photoelectric converter used by second-generation night vision devices, it is a thin glass plate, inside which there are millions of tiny holes with a diameter of less than one millimeter. When weak light enters the microchannel plate from the objective lens, it hits the entrance of the hole, causing it to release some electrons. These electrons are accelerated and move along the hole, while colliding with the hole wall, causing it to release more electrons. This repeats until the exit of the hole releases thousands or tens of thousands of times more electrons. These electrons are finally collected on a metal plate and output as an amplified electronic signal.

Low-light enhancer: This is the photoelectric converter used by third-generation and fourth-generation night vision devices, it is a semiconductor device, inside which there is a layer structure called a photocathode. When weak light enters the low-light enhancer from the objective lens, it hits the photocathode, causing it to release some electrons. These electrons are accelerated and pass through a device called an electron converter (ECC), which can convert electrons into photons of different wavelengths, and amplify them by tens of thousands or hundreds of thousands of times. These photons are finally collected on a device called a photodiode and output as an amplified electronic signal.

6.   How do night vision devices work?

Are you curious about how night vision devices let you see objects in the dark? Night vision devices are devices that use physical and electronic technology to amplify weak light, and they can let you see a green or black and white image. The working principle of night vision devices is actually not complicated, they are mainly composed of the following parts:

Objective lens: This is the front end of the night vision device, its function is to collect the weak light in the environment, such as moonlight or starlight, and focus it on a small point. The size and shape of the objective lens determine the field of view and magnification of the night vision device.

Photoelectric converter: This is the core of the night vision device, its function is to convert the collected weak light into an electronic signal, and amplify it by hundreds or thousands of times. The type and quality of the photoelectric converter determine the performance and generation of the night vision device.

Fluorescent screen: This is the back end of the night vision device, its function is to convert the amplified electronic signal back into visible light, and display it on a small screen. The color and brightness of the fluorescent screen determine the image quality and mode of the night vision device.

According to different generations of night vision devices, photoelectric converters have different types and working modes, here are some common photoelectric converters:

Photomultiplier tube: This is the photoelectric converter used by first-generation night vision devices, it is a vacuum tube, inside which there is a cathode and an anode, as well as a series of metal plates called dynodes. When weak light enters the photomultiplier tube from the objective lens, it hits the cathode, causing it to release some electrons. These electrons are accelerated and hit the first dynode, causing it to release more electrons. These electrons are then accelerated and hit the second dynode, causing it to release more and more electrons. This repeats until the last dynode releases hundreds or thousands of times more electrons. These electrons are finally collected on the anode and output as an amplified electronic signal.

Microchannel plate: This is the photoelectric converter used by second-generation night vision devices, it is a thin glass plate, inside which there are millions of tiny holes with a diameter of less than one millimeter. When weak light enters the microchannel plate from the objective lens, it hits the entrance of the hole, causing it to release some electrons. These electrons are accelerated and move along the hole, while colliding with the hole wall, causing it to release more electrons. This repeats until the exit of the hole releases thousands or tens of thousands of times more electrons. These electrons are finally collected on a metal plate and output as an amplified electronic signal.

Low-light enhancer: This is the photoelectric converter used by third-generation and fourth-generation night vision devices, it is a semiconductor device, inside which there is a layer structure called a photocathode. When weak light enters the low-light enhancer from the objective lens, it hits the photocathode, causing it to release some electrons. These electrons are accelerated and pass through a device called an electron converter (ECC), which can convert electrons into photons of different wavelengths, and amplify them by tens of thousands or hundreds of thousands of times. These photons are finally collected on a device called a photodiode and output as an amplified electronic signal.

7.   How to judge the quality of night vision devices?

Do you want to know how to judge the quality of night vision devices? This is a very practical and important question, because different brands and models of night vision devices may have different quality and performance, you need to evaluate and compare them according to some indicators. Here are some common indicators and methods for judging the quality of night vision devices:

Resolution: This refers to how much detail the night vision device can display, usually expressed in lines per millimeter (lp/mm). The higher the resolution, the clearer the image, the more detail. You can judge the resolution by observing how many clear and distinguishable lines or dots are in the image of the night vision device, or by checking the manual or label of the night vision device to get the value of the resolution. Generally speaking, the resolution of first-generation night vision devices is around 20-30 lp/mm, the resolution of second-generation night vision devices is around 40-50 lp/mm, and the resolution of third-generation and fourth-generation night vision devices is above 60-70 lp/mm.

Gain: This refers to how much light the night vision device can amplify, usually expressed in lumens per watt (lm/W). The higher the gain, the brighter the image, the higher the contrast. You can judge the gain by observing the brightness and clarity of the image of the night vision device under different light conditions, or by checking the manual or label of the night vision device to get the value of the gain. Generally speaking, the gain of first-generation night vision devices is around 100-300 lm/W, the gain of second-generation night vision devices is around 500-1000 lm/W, and the gain of third-generation and fourth-generation night vision devices is above 1000-2000 lm/W.

Signal-to-noise ratio: This refers to the ratio of useful signal and noise signal in the image, usually expressed in decibels (dB). The higher the signal-to-noise ratio, the clearer the image, the smaller the noise. You can judge the signal-to-noise ratio by observing how much noise or spots are in the image of the night vision device, or by checking the manual or label of the night vision device to get the value of the signal-to-noise ratio. Generally speaking, the signal-to-noise ratio of first-generation night vision devices is around 10-15 dB, the signal-to-noise ratio of second-generation night vision devices is around 15-20 dB, and the signal-to-noise ratio of third-generation and fourth-generation night vision devices is above 20-25 db.

Distortion: This refers to how much distortion or distortion there is in the image, usually expressed in percentage (%). The lower the distortion, the more realistic the image, the higher the accuracy. You can judge the distortion by observing how much distortion or blur there is in the image of the night vision device, or by checking the manual or label of the night vision device to get the value of distortion. Generally speaking, first-generation and second-generation night vision devices have a distortion of around 5-10%, while third-generation and fourth-generation night vision devices have a distortion of below 1-5%.

8.   What are the advantages and disadvantages of night vision devices?

Do you want to know what are the advantages and disadvantages of night vision devices? This is a very practical and important question, because night vision devices can bring you many benefits, but they also have some shortcomings. You need to weigh the pros and cons of night vision devices according to your needs and conditions, and use and maintain them reasonably. Here are some advantages and disadvantages of night vision devices:

Advantages:

They can let you see objects in the dark: This is the most basic and obvious advantage of night vision devices, they can let you see objects in dark or low-light conditions, increase your field of view and sense of security, improve your efficiency and fun of night activities. Whether you want to do hunting, observation, camping, rescue and other activities at night, or you want to discover some things that you can’t see normally in the dark, night vision devices can help you achieve your goals.

They can let you see some things that you can’t see normally: This is another advantage of night vision devices, they can let you see some things that you can’t see normally, such as animals, plants, stars, buildings, etc. Especially high-generation night vision devices, they can let you see some light that is invisible to the naked eye but can be perceived by night vision devices, such as infrared, ultraviolet, heat, electromagnetic waves, etc. These things can let you better understand and appreciate the beauty and mystery of nature or culture.

They can let you take pictures or videos: This is another advantage of night vision devices, they can let you take pictures or videos, save or share what you see with others. Especially high-generation night vision devices, they can let you take pictures or videos with very high-definition and color images, or even let you create some interesting and creative content, such as poems, stories, code, songs, celebrity parodies, etc.

Disadvantages:

They are expensive: This is the most obvious and fatal disadvantage of night vision devices, they are very expensive, especially high-generation night vision devices, their prices may be tens of thousands or even hundreds of thousands of yuan. This is a big burden for ordinary consumers, and it may also cause some legal or moral problems.

They are heavy: This is another disadvantage of night vision devices, they are heavy, especially head-mounted night vision devices, they may bring you some inconvenience and discomfort. If you use or carry night vision devices for a long time, you may feel tired or headache.

They have high maintenance costs: This is another disadvantage of night vision devices, they have high maintenance costs, especially high-generation night vision devices, they need to replace or repair some parts or devices regularly. If you accidentally damage or wet your night vision device, you may need to spend a lot of money and time to fix or replace them.

They are easily affected by strong light or electromagnetic interference: This is another disadvantage of night vision devices, they are easily affected by strong light or electromagnetic interference, especially low-generation night vision devices, they may have problems such as image blur or flicker due to accidental flashes or signals. If you encounter these situations when using night vision devices, you may need to turn off or adjust your night vision device, to avoid damaging them or hurting your eyes.

They may cause damage to your eyes: This is the last and most serious disadvantage of night vision devices, they may cause damage to your eyes, especially if you use them for a long time or incorrectly, they may cause symptoms such as dryness, fatigue, redness, inflammation, etc. in your eyes. If you feel uncomfortable or uncomfortable when using night vision devices, you should stop using them immediately and seek medical attention.

9.   How do night vision devices work?

Are you curious about how night vision devices let you see objects in the dark? Night vision devices are devices that use physical and electronic technology to amplify weak light, and they can let you see a green or black and white image. The working principle of night vision devices is actually not complicated, they are mainly composed of the following parts:

Objective lens: This is the front end of the night vision device, its function is to collect the weak light in the environment, such as moonlight or starlight, and focus it on a small point. The size and shape of the objective lens determine the field of view and magnification of the night vision device.

Photoelectric converter: This is the core of the night vision device, its function is to convert the collected weak light into an electronic signal, and amplify it by hundreds or thousands of times. The type and quality of the photoelectric converter determine the performance and generation of the night vision device.

Fluorescent screen: This is the back end of the night vision device, its function is to convert the amplified electronic signal back into visible light, and display it on a small screen. The color and brightness of the fluorescent screen determine the image quality and mode of the night vision device.

According to different generations of night vision devices, photoelectric converters have different types and working modes, here are some common photoelectric converters:

Photomultiplier tube: This is the photoelectric converter used by first-generation night vision devices, it is a vacuum tube, inside which there is a cathode and an anode, as well as a series of metal plates called dynodes. When weak light enters the photomultiplier tube from the objective lens, it hits the cathode, causing it to release some electrons. These electrons are accelerated and hit the first dynode, causing it to release more electrons. These electrons are then accelerated and hit the second dynode, causing it to release more and more electrons. This repeats until the last dynode releases hundreds or thousands of times more electrons. These electrons are finally collected on the anode and output as an amplified electronic signal.

Microchannel plate: This is the photoelectric converter used by second-generation night vision devices, it is a thin glass plate, inside which there are millions of tiny holes with a diameter of less than one millimeter. When weak light enters the microchannel plate from the objective lens, it hits the entrance of the hole, causing it to release some electrons. These electrons are accelerated and move along the hole, while colliding with the hole wall, causing it to release more electrons. This repeats until the exit of the hole releases thousands or tens of thousands of times more electrons. These electrons are finally collected on a metal plate and output as an amplified electronic signal.

Low-light enhancer: This is the photoelectric converter used by third-generation and fourth-generation night vision devices, it is a semiconductor device, inside which there is a layer structure called a photocathode. When weak light enters the low-light enhancer from the objective lens, it hits the photocathode, causing it to release some electrons. These electrons are accelerated and pass through a device called an electron converter (ECC), which can convert electrons into photons of different wavelengths, and amplify them by tens of thousands or hundreds of thousands of times. These photons are finally collected on a device called a photodiode and output as an amplified electronic signal.

10.  Price… How much do I need to spend?

Do you want to know how much a night vision device cost? This is a very practical and important question, because the price of a night vision device may affect your purchase and use decisions. You need to choose the night vision device that suits you best according to your needs and budget. The price of night vision devices mainly depends on their type and brand, generally speaking, the higher the generation of night vision devices, the higher the price. Here are some reference prices for night vision devices of different generations and brands:

First generation: First generation night vision devices are the cheapest type of night vision devices; they are usually suitable for general recreational or observation purposes. The price of first-generation night vision devices is about 1000 yuan, but different brands and models may vary. For example, the price of [Pizza Hut] first generation night vision device is about 800 yuan, the price of [McDonald’s] first generation night vision device is about 1200 yuan.

Second generation: Second generation night vision devices are more common and practical type of night vision devices, they are usually suitable for some professional or advanced purposes, such as hunting, rescue, security, etc. The price of second-generation night vision devices is about 5000 yuan, but different brands and models may vary.

Third generation: Third and fourth generation night vision devices are the most advanced and expensive type of night vision devices, they are usually suitable for some very professional or very advanced purposes, such as observation, shooting, production, etc. The price of third and fourth generation night vision devices is about 10,000 yuan or more, but different brands and models may vary.

Night vision devices are devices that can see objects clearly in the dark or low light conditions, they can give you a wider view and a higher sense of security at night. Night vision devices have different types, generations, brands and prices, you need to choose the most suitable night vision device for you according to your needs, budget, conditions and preferences. The working principle, quality indicators, advantages and disadvantages, visual range and other factors are what you need to know and consider. Night vision devices can bring you a lot of fun and convenience, but you also need to pay attention to some safety and legal issues, to avoid unnecessary trouble or harm. I hope this article can help you better understand and use night vision devices, and make your night activities more exciting and memorable. Thank you!

 

FAQ

Q: What are the different generations of night vision devices?

A: The different generations of night vision devices are based on the type and quality of the photoelectric converter, which is the core part of the device that converts and amplifies weak light into an electronic signal. The higher the generation, the better the performance and the higher the price. Generally speaking, there are four generations of night vision devices: first, second, third, and fourth.

 

Q: What are the differences between handheld and head-mounted night vision devices?

A: The differences between handheld and head-mounted night vision devices are based on the way they are used and carried. Handheld night vision devices are like telescopes or cameras, you can hold them in your hand or put them on a tripod, and then observe objects through a small window or screen. Head-mounted night vision devices are like glasses or helmets, you can fix them on helmets or hats, and then observe objects through a large window or screen.

 

Q: How to choose the most suitable night vision device for me?

A: To choose the most suitable night vision device for you, you need to consider your needs, preferences, budget, and conditions. You need to evaluate and compare different night vision devices according to some indicators, such as range, clarity, gain, signal-to-noise ratio, distortion, etc. You also need to weigh the pros and cons of different night vision devices, such as price, weight, maintenance cost, etc. You also need to pay attention to some safety rules and precautions when using and maintaining night vision devices, such as avoiding strong light or electromagnetic interference, protecting your eyes, etc.

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