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.
|Published (Last):||3 October 2013|
|PDF File Size:||18.98 Mb|
|ePub File Size:||13.15 Mb|
|Price:||Free* [*Free Regsitration Required]|
snellne 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 Visual acuity; Vision; Diagnostic techniques, ophthalmological.
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 noted in all the visual acuities analyzed.
A computerized method of visual acuity testing: Comparing clinics results with computerized method, we observed that only 2 clinics obtained better results if compared with the angles obtained sneleln optotypes projection, but the data is very similar and with no statistical significance.
At the same time, measurement of the size of the letters of 4 lines of the Se projection on the wall was performed.
Category:Snellen charts – Wikimedia Commons
In relation to the other clinics, the superiority of the computerized method is very relevant. Kniestedt C, Stamper RL. Descriptive study including 15 Ophthalmology clinics and a computerized method to measure the VA.
Rua Casa do Ator, – cj. Fernando Klein Rua Dr. Escla 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. It was not surprising that no clinic presented an exact angle of 5 arch minutes.
How to cite this article. Using a tape measure and a caliper, measurement of the distance was obtained from the sitting patients’ eye to VA optotypes projection on the wall. Services on Demand Journal. Faivre, 63 – Apto.
Comparison of visual acuity in macular degeneration patients measured with Snellen and early treatment diabetic retinopathy study charts. Desde Snellen, poucas melhorias na medida da acuidade visual foram feitas.
Test de Snellen
Also, the same patient, evaluated in different clinics, can obtain different VA measurements. It can be concluded that there is a great heterogeneity in the evaluation of VA in different Ophthalmology centers.
Ophthalmol Clin North Am.
To analyze the results, it was opted to compare the angles presented by each clinic for each measurement. All the contents of this journal, except where otherwise noted, is licensed under a Creative Commons Attribution License. Visual acuity and its measurement. O que pode ser entendido como uma AV superestimada.
Coletivamente dividimos os 3 centros de oftalmologia para entendermos como eles se comportavam em grupos. Snellen visual acuity evaluation. Estandardizou-se uma tabela com cinco letras em cada fileira iguais ao tamanho da letra. All had differences in comparison to the gold standard.