This story is from The Pulse, a weekly health and science podcast. Find it on Apple Podcasts, Spotify or wherever you get your podcasts. The videos go like this: Someone uses their phone to zoom in on ...

The colored part of the eye surrounding the pupil is called the iris. It automatically regulates the amount of light entering the eyes by regulating the size of the pupil. Light is the primary ...

The iris is a structure behind the transparent cornea of the eye. It has a circular opening called the pupil that changes size in response to the light level. Your pupils are usually the same size as ...

Amanda Meyer is affiliated with the Australian and New Zealand Association of Clinical Anatomists, the American Association for Anatomy, and the Global Neuroanatomy Network. Monika Zimanyi is ...

Pupillary distance helps center your eyeglasses prescription. Your eyeglasses provider normally measures it for you, but you won’t find it on your prescription. If you order glasses online, you’ll ...

Pupillary distance is the space — measured in millimeters (mm) — from the center of one pupil to another. When you need glasses, an optometrist or an optician will measure this distance to make sure ...

In reflection, the attempts made in the 1980s to adapt Stephen King’s “Apt Pupil” had the makings of a “cursed movie” legend. We know that the curse didn’t pan out, as director Bryan Singer was ...