An optical illusion is a riddle where the viewer perceives the image differently. These illusions come in a variety of types, ...

What does 20/20 vision mean? When you visit your doctor or an eye care professional, you may be asked to read an eye chart. You may be told you have normal 20/20 vision. What does that really mean?

Test your observation skills with a tricky optical illusion featuring a jogging man and playful rabbits. Spot five ...

It’s easy -- you’ll read an eye chart. Simple tests, like the "Random E Test," can determine the visual acuity of infants or nonreaders. Eyeglasses are the most traditional form. They bend ...

Take the Snellen eye chart, which is what your eye doctor will usually use to judge your eyesight. The Snellen chart is the one that’s topped with the big E and consists of 11 rows of capital ...

20/20 vision is the general standard that corrective measures try to achieve. However, an individual can have a worse vision or better vision. Learn more here.

Poor outcomes on the Snellen eye chart test are commonly attributed to defects in optical, structural, and/or physiological properties of the eye; eye movements are rarely considered. Rucci and ...

Poor outcomes on the Snellen eye chart test are commonly attributed to defects in optical, structural, and/or physiological properties of the eye; eye movements are rarely considered.

The 20-20-20 rule says that after 20 minutes on the computer, a person should spend 20 seconds looking at an object 20 feet away. This can reduce eye strain.

Explore different eye tests and exams, their importance for vision health, and what to expect during your appointment.

A refraction test is given as part of a routine eye examination. This test tells your eye doctor what prescription you need in your glasses or contact lenses.