El test de Snellen és una prova dissenyada per avaluar l’agudesa visual. Rep el nom en honor de l’oftalmòleg holandès Herman Snellen qui va dissenyar la. Table: Different notations of visual acuity values as decimal values, Snellen fractions, MAR and LogMAR. Decimal. Snellen fractions. MAR. LogMAR. 6m 5m. 4m.

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All the contents of this journal, except where otherwise noted, is licensed under a Creative Commons Attribution License. Comparison of visual acuity in macular degeneration patients measured with Snellen and early treatment diabetic retinopathy study charts.

Also, the same patient, evaluated in different clinics, can obtain different VA measurements. A computerized method of visual acuity testing: Services on Demand Journal. Using a tape measure and a caliper, measurement of esacla distance was obtained from the sitting patients’ eye to VA optotypes projection on the wall.

Snellen visual acuity evaluation

How to cite this article. Desde Snellen, poucas melhorias na medida da acuidade visual foram feitas. To evaluate the visual acuity VA measurement by Snellen chart at three main Ophthalmology centers in Curitiba, compare these measurements with a computerized method for escalla VA and also with the standard theory developed by Hermann Snellen. Ophthalmol Clin North Am.


Category:Snellen charts

Comparing clinics results with computerized method, we observed that only 2 clinics obtained better results if compared with the angles obtained from optotypes projection, but the data snel,en very similar and with no statistical significance.

Coletivamente dividimos os 3 centros de oftalmologia para entendermos como eles se comportavam em grupos. Rua Casa do Ator, – cj.

All had differences in comparison to the gold standard. Kniestedt C, Stamper RL. Descriptive study including 15 Ophthalmology clinics and a computerized method to measure the VA. The computerized method is practical, portable, adjustable for different distances, and maintains optotypes proportionality ratio based on visual angle and approaches the theoretical values recommended by Herman Snellen in Fernando Klein Rua Dr.

Visual acuity; Vision; Diagnostic techniques, ophthalmological.

Estandardizou-se uma tabela com cinco letras em cada fileira iguais ao tamanho da letra. Faivre, 63 – Apto.

It can be concluded that there is a snelle heterogeneity in the evaluation of VA in different Ophthalmology centers. Snellen visual acuity evaluation. Visual acuity and its measurement. At the same time, measurement of the size of the letters of 4 lines of the VA projection on the wall was performed.


It was not surprising that no clinic presented an exact angle of 5 arch minutes.

Test de Snellen

To analyze the results, it was opted to compare the angles presented by each clinic for each measurement. Individually, comparing computerized method to standard Snellen theory, it was observed that a condition very close to the ideal was obtained, in ed words, results very similar to 5 arch minutes were noted in all the visual acuities analyzed.

In relation to the other clinics, the superiority of the computerized method is very relevant. O que pode ser entendido como uma AV superestimada.