It's important to keep in mind that most people with open-angle glaucoma, the most common type, have no symptoms until they have lost a significant amount of vision.
The condition can be prevented, but once vision is lost, it is irreversible. That is why it's very important to get regular exams with an eye doctor, particularly if there is a family history of glaucoma.
Symptoms of glaucoma vary, depending on its type.
Dim light might make it difficult for the eyes to focus, which can cause short-term eye fatigue, says Richard Gans, MD, FACS, an ophthalmologist with the Cleveland Clinic Cole Eye Institute. "But there is no scientific evidence that reading in the dark does any long-term harm to your eyes," Gans says.
Challenging visual work, such as reading in insufficient light, can also lead to short-term drying of eyes because you blink less often, Gans adds. Again, this is uncomfortable, but it doesn’t damage the structure or function of the eyes. You can use over-the-counter lubricating drops if dry eyes are a problem.
On the off chance that your next question is going to be, "What about sitting too close to the TV?" we have the same answer. Getting too close to the set for your favorite shows won’t harm your eyes -- "either from overfocusing or from radiation," Gans says.