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Effects on the compensatory responses to positive and negative lenses of intermittent lens wear and ciliary nerve section in chicks

By Katrina L. Schmid and Christine F. Wildsoet


TEffects on the compensatory responses to positive and negative lenses of intermittent lens wear and ciliary nerve section in chicks.his study examined the ocular compensation to lens-induced defocus in chick and the effect of interrupting lens wear on a daily basis. Eyes fitted with +10 D lenses at hatching compensated rapidly, with almost complete compensation after 4 days of lens wear; they had decreased vitreous chamber depth compared to normal eyes and were thus hyperopic when the lenses were removed. In contrast, adaptation to the -10 D lenses was much slower, was still incomplete after 9 days of lens wear, and in this case, eyes had increased vitreous chamber depth and were myopic without the lenses. Adaptation improved when lens wear was delayed until 7 days after hatching. The effect of interrupting lens wear by periods of normal vision varied with the sign of the lenses worn. Hyperopia was always seen in response to +10 D lenses, although the magnitude of the response decreased as the duration of lens wear was decreased. In contrast, even brief periods of normal vision, i.e., 3 hr, prevented the development of myopia in response to the -10 D lenses; this apparent sensitivity to normal vision is similar to that reported for form-deprivation myopia. Ciliary nerve section used here to eliminate accommodation did not alter these response patterns

Topics: 111300 OPTOMETRY AND OPHTHALMOLOGY, Accommodation, Ocular, Contact Lenses, Chickens/, physiology, Refractive Errors/, physiopathology, Vitreous Body/, growth & development, Analysis of Variance, Animals, Ciliary Body/surgery, Comparative Study, Hyperopia/pathology, Hyperopia/physiopathology, Male, Myopia/pathology, Myopia/physiopathology, Refractive Errors/pathology, Research Support, Non, U, S, Gov't, Time Factors, Vitreous Body/pathology
Publisher: Elsevier
Year: 1996
DOI identifier: 10.1016/0042-6989(95)00191-3
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