These are color charts with standardized color pictures used in eye care and diagnosis of color vision defects, e.g., red-green color vision deficiency.

• tests for red-green defect
• in book format, with 23 tables and transparency gray test

Method

Numbers and letters appear over a patterned background in a variety of contrasting colors. While the individual color values of the figures differ from the background, they share the same degree of brightness. That means the pictures can only be recognized by their color and not by how strongly the reflect the light.

If color vision deficiency exists in the patient, individual figures will not be recognized or else they are misperceived as different kinds of objects because of the way the patterns are designed to mislead.

For the testing of visual acuity (visus).

The vision-test characters are aligned according to the Snellen-method.

Visus-values for 5 and 6 m testing-distance are given on the tables.

You have the choice between a table with letters and numbers, a table with “Pflügerhaken” (E-symbols), a table with images for children, a table with just letters or just numbers.

Standardized eye-test for children between the 34. and 36. month and requirement for the U7a

• single symbols in book-form
• incl. cover, 4 answer-symbol cards and keycard
• test-distance: 3 m