Medically reviewed by Johnstone M. Kim, MD Key Takeaways Mydriasis is when the pupil stays wide and doesn't respond to light.Certain medicines, like antihistamines and atropine, can cause ...

Medically reviewed by Diana Apetauerova, MD Key Takeaways Anisocoria is when the pupils of your eyes are different sizes.

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 ...

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 ...

Rachael has a degree in Zoology from the University of Southampton, and specializes in animal behavior, evolution, palaeontology, and the environment.View full profile Rachael has a degree in Zoology ...

School attendance figures are dwindling, there are more pupils than ever before needing additional support, and a demanding legion of exams – all of which mean pupils are struggling to learn, an ...

We were unable to process your request. Please try again later. If you continue to have this issue please contact [email protected]. Multifocal and single vision lenses performed similarly ...