Album Description 38 Ishihara test pages:
The Ishihara test album 38 pages Comed is based on the principle of recognition of numbers consisting of small circles.
This album Ishihara, consisting of 38 boards is used by ophthalmologists in the precise identification of the types of color blindness (Colour Blind).
Technical features of the Ishihara test album 38 pages:
Device to detect deficiencies in color
The album should be held about 75 cm from the visual axis and perpendicular. The normal order of the boards isidentified by a number printed on the back of each. the figures on the boards numbered 25 January should be recognized more than 3 seconds. If the subject knows no these figures, we will use the boards 26 28 on which the winding route between the two X will come with a brush in 10 seconds.
Cardboard cover # 28
Paper pages of black wool
Case carton # 11
- Number of pages: 38
- Dimensions (LxWxH): 195 mm x 150 mm x 36 mm
- Packaging: In a white case