Definition of Snellen letter

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DataRay Inc. - ISO 11146-Compliant Laser Beam Profilers

Photonics Dictionary

Snellen letter

The letter form used on visual performance test charts. The overall letter height is equal to five times the thickness of individual strokes. Normal 20/20 vision is represented by the ability to distinguish snellen letters that subtend an overall angle of 5 arc minutes.

Ohara Corp. - Optical Glass, Polish substrates 10-23

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