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At 20 feet away, the size of the letters on a Snellen eye chart, on one of the smaller lines near the bottom, has been standardized to correspond to ?normal? visual acuity. This is the 20/20 line.

Name 3 types of Snellen charts. Picture charts. Alphabet charts. E charts.

5) There are different types of eye charts These include Snellen Chart, LogMAR Chart, Jaeger Chart, E Chart, and Landolt C Chart.

Line 3: This line is ~ 20/40. You need to be able to read letters this size to pass the vision test for your drivers licence in California. ?Line 4, 5 & 6: These lines are 20/30, 20/20 and 20/10 respectively. Visual acuity in this range is considered to be "normal".

A Snellen chart is an eye chart that can be used to measure visual acuity.

The four most common eye charts used are: SNELLEN. The original eye chart designed in the 1860's by the Dutch eye doctor Hermann Snellen. ... TUMBLING E. This type of eye chart is used for children that are too small to read or adults with reading or speaking difficulties. ... LANDOLT C. ... ETDRS.

The most common in clinical practice is the Snellen chart, while research studies more often use logMAR charts, such as the Early Treatment of Diabetic Retinopathy Study (ETDRS) chart. The Snellen Chart uses a geometric scale to measure visual acuity, with normal vision at a distance being set at 20/20.

The visual acuity test is used to determine the smallest letters you can read on a standardized chart (Snellen chart) or a card held 20 feet (6 meters) away. Special charts are used when testing at distances shorter than 20 feet (6 meters). Some Snellen charts are actually video monitors showing letters or images.

The 20/20 mark is the mark that a person with normal acuity can read at a distance of six metres. The line on the eye chart is the Eighth line, that's the one that marks 20/20 vision.

A Snellen chart is an eye chart that can be used to measure visual acuity. Snellen charts are named after the Dutch ophthalmologist Herman Snellen, who developed the chart in 1862. Many ophthalmologists and vision scientists now use an improved chart known as the LogMAR chart.