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Proximal and cognitively‐induced accommodation
Author(s) -
Rosenfield Mark,
Ciuffreda Kenneth J.
Publication year - 1990
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.1475-1313.1990.tb00860.x
Subject(s) - accommodation , psychology , audiology , cognition , vergence (optics) , optometry , developmental psychology , optics , medicine , physics , neuroscience
The aim of this study was to investigate proximally‐induced accommodation (PIA) at two levels of cognitive demand. PIA was assessed by comparing the open‐loop accommodative responses to stimuli located at viewing distances of 6 m (0.17 D) and 0.33 m (3 D), respectively. The vergence and accommodation loops were opened by subjects monocularly viewing the targets through a 0.5 mm pin‐hole. PIA was measured while subjects either were encouraged to relax and listened to popular music, or performed a relatively demanding mental arithmetic task (counting backwards in sevens). The results indicated that for 4 of the 12 subjects examined, increased cognitive demand produced a marked (> ± 1.00 D) change in the magnitude of PIA. This finding suggests the presence of an interaction between the output of proximally‐and cognitively‐induced accommodation in these subjects. Such an interaction may hinder attempts to examine individual, non‐optical components of accommodation.