Sehschärfeschart

Sehschärfeschart refers to a visual acuity chart, commonly known as an eye chart, used to measure how well a person can see at various distances. The most well-known type is the Snellen chart, developed by Dutch ophthalmologist Herman Snellen in the 1860s. These charts typically consist of rows of letters, numbers, or symbols that decrease in size from top to bottom.

The measurement of visual acuity is expressed as a fraction, such as 20/20 or 6/6. The top number represents the distance in feet (or meters) at which the person is tested, and the bottom number indicates the distance at which a person with normal vision could read the same line. Therefore, 20/20 vision means the individual can see at 20 feet what a person with normal vision can see at 20 feet. Conversely, 20/40 vision means the individual needs to be at 20 feet to see what a person with normal vision can see from 40 feet away.

Sehschärfescharts are essential tools in optometry and ophthalmology for diagnosing refractive errors like myopia (nearsightedness), hyperopia (farsightedness), and astigmatism, as well as other vision impairments. They are also used in routine eye examinations for general health screening and to monitor the effectiveness of corrective lenses. Variations of the basic chart exist, including tumbling E charts for individuals who cannot read the alphabet and charts designed for specific age groups, such as children.