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Y. Cohen, M. Belkin, U. Polat; The Effect of Light Intensity on the Development of Refraction in Chicks' Lid Sutured Eye. Invest. Ophthalmol. Vis. Sci. 2010;51(13):1732.
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Ambient light intensity regulates the development of refraction in chicks reared under continuous light (Cohen et al., 2008). Form deprivation, such as via lid suturing, induce a refractive error in chicks' eyes. We examined the combined effect of light intensity and lid suture on the evolution of the refractive changes in chicks reared under continuous light.
Chicks with monocular lid suture were reared under 24-h lighting at three different light intensities: 10 000 lux (n = 12), 1000 lux (n = 9), and 50 lux (n = 11). A control group was reared under light dark cycle with light intensity of 1000 lux (n=10). Their eyes underwent repeated retinoscopy and keratometry, as well as ultrasound measurements.
Light intensity was correlated with chicks' refraction and ocular parameters in the lid sutured eyes (r= 0.4-0.7). On day 90 after hatching, the exposure of the lid sutured eye to light intensities of 10 000, 1000 and 50 lux respectively developed hyperopia of +12.8 ± 4.1 diopters (D), +8.8 ± 2.3 D and +6.2 ± 3.6 D, and corneal refractive power of 42.5 ± 1.6D, 45.6 ± 3.3D and 47 ± 4.1D. Axial length in the three groups differed significantly, ranging from 16.5 ± 0.6 mm at 10 000 lux to 15.6 ± 0.9 mm at 50 lux. The refraction of the opened fellow eye was less hyperopic then the refraction of the lid sutured eye in all examined groups.
Under continuous light, ambient light intensity affect the development of chicks' refraction and ocular shape in a monocular lid sutured eye. Thus, we suggest that light intensity dependent regulation of chicks' ocular development is at least partially independent from a form vision.
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