Effects on the compensatory responses to positive and negative lenses of intermittent lens wear and ciliary nerve section in chicks
Schmid, Katrina L. & Wildsoet, Christine F. (1996) Effects on the compensatory responses to positive and negative lenses of intermittent lens wear and ciliary nerve section in chicks. Vision Research, 36(7), pp. 1023-1036.
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.
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|Item Type:||Journal Article|
|Additional Information:||For more information, please refer to the journal’s website (see link) or contact the author. Author contact details: firstname.lastname@example.org|
|Keywords:||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|
|Subjects:||Australian and New Zealand Standard Research Classification > MEDICAL AND HEALTH SCIENCES (110000) > OPTOMETRY AND OPHTHALMOLOGY (111300)|
|Divisions:||Current > QUT Faculties and Divisions > Faculty of Health
Current > Institutes > Institute of Health and Biomedical Innovation
|Copyright Owner:||Copyright 1996 Elsevier|
|Deposited On:||13 Jun 2006|
|Last Modified:||15 Jan 2009 07:03|
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