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 ...
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 ...
Have you ever noticed a sudden burst of light in your vision or zigzag lines appearing out of nowhere? Such visual changes can happen before an intense headache and may signal migraines. Symptoms vary ...
Some results have been hidden because they may be inaccessible to you
Show inaccessible results