Vision scientist Michael Webster, PhD, at the University of Nevada, has shown that the environment influences color perception. He has studied how people in tropical environments might calibrate their ...

Good vision is a characteristic that is nice to have. Unfortunately, only 35% of adults have 20/20 vision without the use of glasses, contacts, or vision-correcting surgery. Though many of us do not ...

A gene therapy has enabled people with a rare type of total colour blindness to faintly see red. In a small trial, those who could previously only detect shades of grey went on to distinguish a red ...

Tritanopia is a type of color vision deficiency that may make it hard for someone to distinguish between blue and green, pink and yellow, and red and purple. Color vision deficiency, also called color ...

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 ...