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 ...

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 ...

A 62-year-old male patient presented with a shadow in the visual axis of the right eye. There was no previous history of intraocular surgery or trauma. Around the same time he was diagnosed by his ...

In the first study of its kind to explore caffeine’s effects on dynamic visual skills, researchers concluded that caffeine increases alertness and detection accuracy for moving targets. Caffeine also ...