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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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A computerized method of visual acuity testing: Snellen visual acuity evaluation. Kniestedt C, Stamper RL.

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 calibrating VA and also with the standard theory developed by Hermann Snellen. Using a tape measure and a caliper, measurement escla the distance was obtained from the sitting patients’ eye to VA optotypes projection on the wall.

Category:Snellen charts

Rua Casa do Ator, – cj. Fernando Klein Rua Dr. It can be concluded that there is a great heterogeneity in the evaluation of VA in different Ophthalmology centers.

Desde Snellen, poucas melhorias na medida da acuidade visual foram feitas. At the same time, measurement of the size of the letters of 4 lines of the VA projection on the wall was performed. How to cite this article. Coletivamente dividimos os 3 centros de oftalmologia para entendermos como eles se comportavam em grupos.


Estandardizou-se uma tabela com cinco letras em cada fileira iguais ao tamanho da letra. In relation to the other clinics, the superiority of the computerized method is very relevant.

Also, the same patient, evaluated in different clinics, can obtain different VA measurements. Visual acuity and its measurement.

Category:Snellen charts – Wikimedia Commons

To analyze the results, it was opted to compare the angles presented by each clinic for each measurement. All had differences in comparison to the gold standard. Services on Demand Journal. Faivre, xe – Apto. 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 Individually, comparing computerized method to standard Snellen theory, it was observed that a condition very close to the ideal was obtained, in other words, results very similar to 5 arch minutes were sjellen in all the visual acuities analyzed.


All the contents of this journal, anellen where otherwise noted, is licensed under a Creative Commons Attribution License. It was not surprising that no clinic presented an exact angle of 5 arch minutes.

Explicación del examen de la vista y tablas optométricas

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 is very similar and with no statistical significance. O que pode ser entendido como uma AV superestimada. Descriptive study including 15 Ophthalmology clinics and a computerized method to measure the VA.

Visual acuity; Vision; Diagnostic techniques, ophthalmological. Ophthalmol Clin North Am. Comparison of df acuity in macular degeneration patients measured with Snellen and early treatment diabetic retinopathy study charts.