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Sandra Priolo, Jacob G. Sivak, Jer R. Kuszak, Elizabeth L. Irving; Effects of Experimentally Induced Ametropia on the Morphology and Optical Quality of the Avian Crystalline Lens. Invest. Ophthalmol. Vis. Sci. 2000;41(11):3516-3522.
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purpose. To examine the effects of refractive error on avian lens morphology and
methods. Hatchling white leghorn chicks were unilaterally goggled for 7 days
with either a form-deprivation goggle (n = 12), a −10
D defocus goggle (n = 12), or a +10 D defocus goggle
(n = 12) to induce myopia and hyperopia. Optical
quality of lenses (focal length and focal length variability) from
treated and contralateral control eyes was assessed using a scanning
laser apparatus. Lens morphology was examined by light and electron
results. Although the induction of refractive errors did not significantly alter
lens size, shape, paraxial focal length, or average focal length,
average focal length variability increased. Lenses from eyes goggled
with form-deprivation and +10 D defocus goggles demonstrated a twofold
increase in average focal length variability, when compared with their
contralateral controls. The morphology of the lens is not altered by
these experimental manipulations.
conclusions. This study provides evidence that the refractive development of the
chick lens is not independent of the refractive development of the
ocular globe and that chick lenticular development is influenced by
both genetics and visual experience.
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