Impaired vision and blindness are common. About 3.4 million people in the US are blind or visually impaired. Vision is usually measured by visual acuity charts, and normal vision is expressed as 20/20 ...

People with central vision loss can judge the motion of vehicles almost as accurately as people with normal vision, a new ...

Scientists are making dramatic strides toward a goal that once seemed almost unimaginable: Restoring limited vision to people affected by a previously irreversible form of blindness caused by an ...

Acuity of vision is a term used to describe the clearness or sharpness of your vision when measured at a distance of 20 feet. ‌ Visual acuity is the most common clinical measurement of how your eyes ...

Normal vision depends on a multifaceted, complex process. Light enters the eye through the cornea, where some of it passes through the pupil, the black-appearing opening in the iris, which controls ...

A 26-year-old female nursing school graduate was referred to the New England Eye Center for decreased vision in both eyes with a normal fundus exam. One month before referral, she noted gradually ...

It’s often called the optic that best approximates human vision, but approximation is relative. An Object Lesson. But the concept of “normal vision,” let alone the 50-mm lens’s ability to reproduce it ...