In blinding bright light or pitch-black dark, our eyes can adjust to extreme lighting conditions within a few minutes. The ...

Medically reviewed by Andrew Greenberg, MD Photophobia is an intolerance or sensitivity to light. It is linked to various eye ...

A small, bright object in a dark room confuses your eye. The "average" amount of light is low, your irises open up, and the bright "pinpoint" of light strains part of your retinas.

Miosis Causes. Age. It's normal for a newborn's pupils to stay small for about 2 weeks so their eyes have extra protection from bright light. Your pupils tend to get smaller as you get older, too.

In bright light, they get smaller or constrict to let in less light. Sometimes, pupils can dilate without any change in light. The medical term for this is mydriasis.

Light sensitivity in one eye could be due to minor injuries, migraine, infections, ... Protective eyewear, such as polarized or light-filtering glasses, provides a barrier against bright light.