Snellen chart interpretation
- snellen chart is used to measure
- snellen chart is used to measure visual acuity
- the snellen chart is used to measure which of the following
- the snellen chart is used to measure quizlet
Eye test chart pdf...
Snellen chart
Eye chart
Medical diagnostic method
| Snellen chart | |
|---|---|
| Purpose | Snellen chart is used to estimate visual acuity (last three rows are 20/15, 20/13 and 20/10) |
A Snellen chart is an eye chart that can be used to measure visual acuity.
Snellen chart 6/6
Snellen charts are named after the Dutch ophthalmologistHerman Snellen who developed the chart in 1862 as a measurement tool for the acuity formula developed by his professor Franciscus Cornelius Donders.[1][2] Many ophthalmologists and vision scientists now use an improved chart known as the LogMAR chart.
History
[edit]Snellen developed charts using symbols based in a 5×5 unit grid. The experimental charts developed in 1861 used abstract symbols.[3] Snellen's charts published in 1862 used alphanumeric capitals in the 5×5 grid.
The original chart shows A, C, E, G, L, N, P, R, T, 5, V, Z, B, D, 4, F, H, K, O, S, 3, U, Y, A, C, E, G, L, 2.[2]
Description
[edit]The normal Snellen chart is printed with eleven lines of block letters.
The first line consists of one very large lett
- a snellen chart is used to measure visual activity
- snellen chart is used to test