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 ...

Currently, there is no cure available for color vision deficiency that is present from birth. However, supportive tools, such as glasses, contacts, and visual aids, can help people navigate color ...

Most individuals with color vision deficiency have had it since birth. However, people can develop it later in life. If it develops due to a health problem, color blindness can worsen over time. Color ...