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BS

BS 4274-1:1968

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Basic requirements for test charts designed for either internal or external illumination, employing English (Roman) capital letters to determine the distance visual acuity. Provision is also made for the single letter C (Landolt or broken ring) and the single letter E (illiterate E) in various orientations.

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Product Details

Published:
01/26/1968
ISBN(s):
0580000397
Number of Pages:
12
File Size:
1 file
Product Code(s):
862695, 862695, 862695
Note:
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