How is a vision test performed with illiterates?

Ophthalmologists have found a creative way to make this assessment

Ophthalmologists apply adapted versions of the exams. Differentiation between literate and illiterate happens only when it comes to testing visual acuity – the ability to perceive detail and distinguish figures. This acuity is measured from 0.1 (worst) to 1 (best). Check out the main exams below.

1) TELLER CARDS
Stripes draw more attention than the gray part. But they get smaller with each card. The test proceeds until the patient shows no preference (do not notice the stripes). Then just see the acuity estimate on that card

2) SNELLEN TABLE
It is the most used. For illiterates, the version that carries the letter “E” is used in several directions. The patient shows with his hand the pointed direction. The lines are getting smaller and the more of them the person can identify, the greater the acuity

3) CARDIF CARDS They
follow the same principle as Teller’s, but using figures. Each card has a figure on one side, which decreases on the following. Every card carries an estimate of acuity

4) LANDOLT TABLE
It is similar to Snellen’s, but uses the letter C and has twice as many possible positions as it includes the diagonals. In clinical day to day it is little used, but its precision is good for scientific studies

TdF suggested – Kaue Siqueira

CONSULTING Keila Monteiro, ophthalmologist and member of the board of the Brazilian Council of Ophthalmology; Natália Belo Rodrigues, ophthalmologist at the Piracicaba Specialty Medical Outpatient Clinic (AME); and Carlos Eduardo Leite Arieta, coordinator of the ophthalmology discipline and responsible for the external and cataract outpatient clinic of the Faculty of Medical Sciences of Unicamp /  FONTE Article Assessment of Visual Snellen Acuity (several authors)

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