If your eyes are sensitive to light, or if you suffer from photophobia, a screen that reduces glare from your computer monitor may help. There are many online sources for glare-reducing screens. These are just two.
Or search on anti glare screen for monitor.
Blue light emitted by computers can also be irritating, and even damaging, to the eyes, and interfere with normal sleep. Several companies make eye glasses, prescription and non-prescription, that block blue light.