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Effects of posterior segment disorders on oscillatory displacement thresholds, and on acuities as measured using the Potential Acuity Meter and laser interferometer
Author(s) -
Barrett Brendan T.,
Davison Peter A.,
Eustace Peter E.
Publication year - 1994
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.1475-1313.1994.tb00101.x
Subject(s) - visual acuity , interferometry , optometry , vernier acuity , displacement (psychology) , ophthalmology , audiology , medicine , optics , psychology , physics , psychotherapist
Oscillatory displacement thresholds (ODTs) were measured in 67 subjects with clear ocular media, but known posterior segment disorders. The ability of these thresholds to assess reduced visual function, as quantified by visual acuity deficits, was compared with that of the Potential Acuity Meter (PAM) and the Rodenstock Retinometer (RR). ODTs were found to be sensitive to acuity deficits which were retinal/neural in origin. Despite the fact that interferometric acuities are, unlike ODTs, a measure of resolution, the RR proved no more accurate in assessing the level of letter acuity which existed than did ODT measurement. As would be expected, the PAM provided for the most accurate means of assessing non‐optical visual acuity deficits. However, the PAM proved lo be less useful in eyes with: very poor levels of acuity, and certain anomalous conditions. The results have implications for the relative ability of each of the three tests to identify reduced visual function behind cataract.