April 2010
Volume 51, Issue 13
Free
ARVO Annual Meeting Abstract  |   April 2010
The Effect of Light Intensity on the Development of Refraction in Chicks' Lid Sutured Eye
Author Affiliations & Notes
  • Y. Cohen
    Tel-Aviv University, Goldschleger Eye Research Institute, Tel-Hashom, Israel
  • M. Belkin
    Tel-Aviv University, Goldschleger Eye Research Institute, Tel-Hashom, Israel
  • U. Polat
    Tel-Aviv University, Goldschleger Eye Research Institute, Tel-Hashom, Israel
  • Footnotes
    Commercial Relationships  Y. Cohen, None; M. Belkin, None; U. Polat, None.
  • Footnotes
    Support  None.
Investigative Ophthalmology & Visual Science April 2010, Vol.51, 1732. doi:
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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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      © ARVO (1962-2015); The Authors (2016-present)

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Abstract

Purpose: : 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.

Methods: : 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.

Results: : 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.

Conclusions: : 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.

Keywords: hyperopia • refractive error development • myopia 
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