Ishihara Test Chart Book, for Color Deficiency Tip Covers (1 viewer per package)

(1 viewer per package)

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have proven to be an effective and easy-to-use method of screening vision for all ages

accurate and repeatable CCT measurements by using advanced signal processing and custom data algorithms

Rechargeable

Ishihara Test Chart Book, for Color Deficiency Tip Covers (1 viewer per package)Manufacturer Part Number: 1257 (10 Plate), 1254 (14 Plate), 1255 (24 Plate), 1256 (38 Plate) Accepted by leading authorities as a simple and accurate method for discovering congenital color blindness and red green blindness, each in two forms, complete and incomplete. Includes four special plates for tests to determine the kind and degree of defect in color vision. Makes use of the peculiarity that in red green blindness, blue and yellow appear