Most people would expect that their eyesight would be as good at home as it is when they have their sight test at the optician. However, in some previous studies, people have reported having more sight difficulties in their daily lives than you would expect from someone with their sight test results.
For people with eye conditions like glaucoma, this can affect how their condition is managed. Glaucoma causes an increase in the pressure inside the eye, which damages the main nerve behind the eye (the optic nerve). This can cause poor eyesight in one eye or both eyes. Doctors recommend that people with glaucoma have regular sight tests so that any problems can be picked up and treated, before they affect vision. Accurate sight tests help doctors to spot and treat vision problems early. Read more at WebMD.