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VERTICAL YOKED PRISM—PATIENT ACCEPTANCE AND POSTURAL ADJUSTMENT
Author(s) -
Sheedy James E.,
Parsons Steven D.
Publication year - 1987
Publication title -
ophthalmic and physiological optics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.147
H-Index - 66
eISSN - 1475-1313
pISSN - 0275-5408
DOI - 10.1111/j.1475-1313.1987.tb00742.x
Subject(s) - prism , delta , psychology , optometry , prism adaptation , population , lens (geology) , adaptation (eye) , physical medicine and rehabilitation , medicine , optics , engineering , physics , environmental health , neuroscience , aerospace engineering
— Vertical yoked prism is sometimes incorporated into multifocal lenses to obtain a thinner lens, or prescribed for oculomotor deficiencies, or occurs if the vertical placement of spectacle lenses before the eyes is inappropriate. Patient acceptance of and postural and perceptual adaptation to such prism were studied. Twenty‐three subjects wore spectacles with no vertical prism and also with bilateral vertical yoked prism. The subject population could not significantly differentiate between 2 Δ base down and 0 Δ . There was a nearly unanimous rejection of 4 base down. Postural changes were significant during 4 Δ wear but not during 2 Δ wear. The results suggest that 2 Δ may be accepted by most patients, but 4 Δ will not.