The PERRLA test is a standard eye examination that can help healthcare professionals diagnose a wide range of health issues, including vision problems and some neurological conditions. People may ...

A person’s pupils may be of different sizes (anisocoria) for several reasons, including physical trauma, response to light, and infection. The condition may also be present from birth. Pupils, or the ...

Take a close look at a house cat's eyes and you'll see pupils that look like vertical slits. But a tiger has round pupils — like humans do. And the eyes of other animals, like goats and horses, have ...