Pupil size can decrease up to 0.4 millimeters per decade, hinting at why it can be increasingly harder for people to see in dim light as they age.

Laughter may be as effective as eye drops in improving symptoms of dry eye disease, finds a clinical trial from China published by The BMJ today

After treatment, nearsightedness progresses at age-expected rate

A new study from WashU Medicine in St. Louis identifies a possible way to slow or block age-related macular degeneration, a leading cause of blindness in people over age 50.

Findings could lead to earlier detection and treatment for those suffering from the serious eye condition.

Toxoplasma gondii, a.k.a. toxo, is a major cause of vision loss and other serious complications, and it may even alter people's behavior.