Why Screens Make Your Eyes Tired
Two things happen when you stare at a screen. First, you blink less - about a third as often as normal. This dries out your eyes. Dry eyes feel gritty, tired, and sometimes burn. Second, your eye muscles stay locked at one focal distance for hours. They were not designed for this. The fatigue is real but the cause is mechanical, not spectral.
Blue light gets blamed for eye strain, but the research does not back this up. The American Academy of Ophthalmology does not recommend blue light glasses for eye strain. Their position: the problem is how we use screens, not the light from them.
What Actually Helps
The 20-20-20 rule. Every 20 minutes, look at something 20 feet away for 20 seconds. This releases your eye muscles from constant close focus. It is free and it works better than any lens coating.
Anti-fatigue lenses. These add a small magnification boost (+0.25 to +0.50) at the bottom of the lens. It is like a tiny reading boost that reduces the effort your eyes put into focusing. Not the same as reading glasses. Fytoo offers these as an add-on.
Blue light coating. The science is thin for daytime use. But if you work late, reducing blue light in the hours before bed helps with sleep. Fytoo includes blue light filtering free - take it, but do not expect it to fix eye strain.
Proper prescription. The single biggest factor. If your prescription is off by even 0.25 diopters, your eyes work harder all day. Get an up-to-date eye exam before ordering computer glasses.
Optimal Screen Setup for Eye Comfort
Optimal screen distance for reducing eye strain: 20-28 inches (50-70 cm) from your eyes, with the top of the screen at or slightly below eye level. Looking slightly downward (about 15-20 degrees) reduces the exposed eye surface area and slows tear evaporation - your eyes stay wetter longer. Monitor brightness should roughly match the ambient room brightness. A bright white screen in a dark room forces your pupils to constantly adjust, which is fatiguing. Set your screen brightness so a white background looks about as bright as a sheet of paper held next to the monitor. If your room lighting is 300-500 lux (typical office), your screen should be roughly 120-150 cd/m². Most monitors ship at 250-300 cd/m², so you likely need to turn brightness down, not up.
Making the 20-20-20 Rule Stick
Making the 20-20-20 rule actually stick: set a recurring timer on your phone or computer (every 20 minutes is roughly 24 times in an 8-hour workday - unrealistic for most people, but even hitting it 8-10 times helps). The "20 feet" part matters because it forces your ciliary muscles to fully relax - looking across the room is not the same as glancing at the far wall of a cubicle. If you work in a small space, look out a window. Blink exercises help too: close your eyes deliberately for 2 seconds, squeeze gently, then open. Do this 5 times whenever you finish a 20-second gaze break. Combined with a screen distance of 50-70cm and brightness matched to room lighting, these three habits - blink, break, distance - do more for eye comfort than any lens coating alone. Anti-fatigue lenses (+0.25 to +0.50 add power at the bottom) complement these habits but do not replace them.
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FAQ
Do computer glasses really work?
Anti-fatigue lenses with a small magnification boost help by reducing focusing effort. Blue light filtering alone probably does not reduce eye strain, though it may help with sleep if you use screens late at night.
What is the 20-20-20 rule?
Every 20 minutes, look at something 20 feet away for 20 seconds. It gives your eye muscles a break from constant close-up focus. Ophthalmologists recommend this more than any lens coating.
Should I get blue light glasses for computer work?
The American Academy of Ophthalmology says probably not necessary for eye strain. But if Fytoo includes it free, there is no downside to having it. Just do not expect it to be a magic fix.