Hallucinogen persisting perception disorder (HPPD) is a rare medical condition that can cause visual disturbances (sometimes called flashbacks) if you’ve taken hallucinogenic drugs in the past. With ...

Unexpected flashes of light in your eye can be alarming, and in many cases, it's something that should be discussed with your ...

The human eye represents one of the body’s most complex and revealing organs, providing not only the gift of sight but also functioning as an early warning system for numerous health conditions. The ...

Robey, William H. — Clinical Professor of Medicine, Emeritus, Harvard University. For record and address of author see "This Week's Issue," page 280. Select the format you want to export the citation ...