FIELD: medicine; ophthalmology.
SUBSTANCE: bidirectional-prism spheroprismatic lenses comprise a prism with a horizontally-directed base and a prism with a vertically-directed basis. Strength of the second vertically-directed prism differs upward from that of the first horizontally-directed prism.
EFFECT: unloading of eye muscle at short-distance work related to down-looking.
5 dwg
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