OEM Ishihara Color Test 38 Plates

Ishihara plate series for quick and accurate diagnosis of congenital color vision deficiency. This is the most common form of color vision disorder. Most cases of congenital visual acuity are characterized by a red-green deficiency, which can be of two types: first, protan type which may be absolute (protanapia) or partial (protanomalia), and second, a deutan type which may be absolute (deuteranopia) or partial (deuteranomalia).

To be used in a room with sufficient daylight.

The plates should be at a distance of about 70 cm from the subject so that the paper plane is at right angles to the line of sight.

The numbers or symbols that appear in the tables are declared and each answer must be given without delay (less than three seconds).

It is not necessary in all cases to use the specified range of tiles.