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Time‐of‐day variations in oculomotor function: II. Steady‐state accommodation to square‐wave gratings
Author(s) -
Amerson Thomas L.
Publication year - 1988
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.1475-1313.1988.tb01179.x
Subject(s) - accommodation , tonic (physiology) , morning , evening , square wave , steady state (chemistry) , optics , square (algebra) , mean square , physics , mathematics , optometry , psychology , medicine , mathematical analysis , geometry , chemistry , quantum mechanics , astronomy , neuroscience , voltage
Time‐of‐day variations in both tonic accommodation and steady‐state accommodation to a grating were assessed for 16 observers who were tested once in the morning and again 12 hours later. The mean night‐time tonic accommodation was +0.5 D greater than the morning value. Square‐wave gratings of 4.2 and 8.4c/deg were presented to the observers at distances of 0,1.07, 2.13, 3.2 D. Over‐accommodation to far targets and under‐accommodation to near targets occurred for both gratings. All values of steady‐state accommodation were somewhat greater in the evening. Large individual differences were noted.