Premium
EFFECT OF A NEAR‐VISION TASK ON THE RESPONSE AC/A OF A MYOPIC POPULATION
Author(s) -
Rosenfield Mark,
Gilmartin Bernard
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.tb00737.x
Subject(s) - autorefractor , accommodation , vergence (optics) , optometry , population , refractive error , near vision , optics , psychology , audiology , ophthalmology , physics , medicine , visual acuity , environmental health
— The effect of a 14 minute near‐vision task on the response accommodative convergence/accommodation (AC/A) ratio was investigated for three refractive groups (each comprising N = 17)—emmetropes, early‐onset myopes (EOM), i.e. myopia onset prior to 15 years of age, and late‐onset myopes (LOM), i.e. onset 15 years or later. AC/A ratios were derived from accommodative stimuli of 3.0, 3.9 and 4.6 D. Accommodation was measured using an objective infra‐red autorefractor which allowed unrestricted viewing through a semi‐silvered mirror and this permitted concomitant vergence changes to be assessed using a Maddox rod and tangent scale. EOMs exhibit a significantly higher response AC/A ratio than the two other refractive groups. The implications of these modifications in response AC/A are discussed with reference to current models of accommodation‐vergence interaction.