Most of the HNers are working in IT related field, after while your eye vision will decrease, how do you keep them in healthy or if you use glasses how are you going to make them more healthy?
If you have a mac, try Flux [0] for adjusting the color ambience of your screen based on time of day.
In general, keep the lights on, don't code in the dark. High contrast between your desktop and environment is bad. Keep your eyes at least an arm's length away from your monitor.
Source: I have 20/20 vision and have been addicted to computers my whole life.
Not using computers/tablets after 8.pm and little/no use of computers during the weekends has reduced/stopped my eye strain I had developed from staring at the monitor too much.
My optician told me spending long hours (in dark or sunlight) in front of a television doesn't make your eyesight go bad. It's a common myth. The main reason is simply aging.
I heard eye drops are sometimes needed because you blink less when staring at code. Personally I've never used them.
While that permanent damage is still contested, its true that your eyes can become strained and sore from focusing on a single distance though, so you should still take regular breaks to avoid discomfort, even if there isn't permanent damage. Also the lens of your eye can become weaker and make focusing on further objects harder. There are eye exercises that are mostly centered around alternating focus on near and far objects you can do to stretch the lens.
A very simple exercise to to take something small that has writing on it like a pencil and find something else that is about 10 meters away and also has writing on it and go through the letters on the smaller object while alternating focusing on the far object between each letter. You can do this a few times, moving the small object closer to your face each time. You will feel your eyes get tired very quickly if they are out of shape.
Eyes are muscles and like with any muscle your eyes can experience fatigue. It's just good to give them periodic rest periods. If you're older, computer glasses can help. Again, don't code using low light, keep the room bright so as to prevent strain.
I dont have exact source, but common myth is staring at one point while you are coding, your eyes focus will be adopted to the distance between you and your monitor, muscles inside the eyes will be adopted to less frequent movement and this will cause dropping eyesight. whole body functions in this manner, if you train your muscles they will get bigger, otherwise they will stay as it is and after while you will not be able to muscle power for 100% thats why people are training their brain, muscles and etc,.
In general, keep the lights on, don't code in the dark. High contrast between your desktop and environment is bad. Keep your eyes at least an arm's length away from your monitor.
Source: I have 20/20 vision and have been addicted to computers my whole life.
[0] https://justgetflux.com/