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Snellen's Chart

The Snellen's Chart is a chart developed in 1862 by the Dutch ophthalmologist Herman Snellen, the son of the renowned physician, Dr. F. A. Snellen. The younger Snellen studied medicine in The Netherlands under Gerard Johann Mulder, Jacobus Ludovicus Conradus Schroeder van der Kolk, and Franz Cornelis Donders. He received his medical doctorate at Utrecht in 1858.

Dr. Snellen's chart is used to measure the percentage of loss of visual acuity.

Snellen's Chart Readings Percentage of Loss of Visual Acuity
20/20 0
20/25 5
20/30 10
20/40 20
20/50 25
20/60 33 1/2
20/70 40
20/80 50
20/90 62 1/2
20/100 75
20/110 80
20/120 85
20/130 87
20/140 89
20/150 91
20/160 93
20/170 95
20/180 97
20/190 99
20/200 100

Any other deviation from normal vision caused by the injury shall be considered.

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