An eye health problem would be referred to the Eye Clinic in a hospital. An orthoptist may use the Dunlop test for Reference eye stability. Our eyes each see a slightly different view, particularly in close vision. One eye has to take control, or we would have double or alternating vision. This stabilisation usually happens by the age of seven years.
Some people are light or colour sensitive.
They do not know this, because no one knows how or what someone else sees. Bright sunlight or florescent lights may bother some people. Black print on white paper may be uncomfortable for the eyes. The colours and brightness on computer screens can be adjusted. Effects on literacy.