Zeiss Visual Photometer (Birch-Hirschfeld) Pamphlet 1938

SKU BR5728/Zeiss Visual Photometer Pamphlet
Very Good condition. 4 page pamphlet, Med 319/Ie. Carl Zeiss Jena, 1938.

The Birch-Herscfeld Visual Photometer is designed for examination for night blindness. It enables rapid test to be made both of the threshold stimulus and of the power of dark adaptation for both white and coloured light.

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