The Effects of Illumination to Experimentally Induced Refractive Errors in the Chick.
- Author:
Eunhee CHO
1
;
Yonghan JIN
Author Information
1. Department of Ophthalmology, Kangnung Hospital, Asan Foundation, #415 Bangdonglee, Sacheonmeon, Kangnung, Kangwondo, 210-850, Korea.
- Publication Type:Original Article
- Keywords:
Emmetropization;
Illumination;
Refractive errors
- MeSH:
Lighting*;
Myopia;
Photoperiod;
Refractive Errors*
- From:Journal of the Korean Ophthalmological Society
2000;41(10):2090-2098
- CountryRepublic of Korea
- Language:Korean
-
Abstract:
The effects of different luminance levels and light sources to emmetropization in the chick were investigaed. One-day-old, forty chicks were reared under condition of unilateral visual deprivation with translucent goggle. Under normal light cycles (12-h light/12-h dark), three kinds of luminance levels and two light sources (incandescent lamp vs fluorescent lamp) were used. Three weeks after hatching, refractive error, axial length, equator diameter and corneal diameter of the eyes were measured. The deprived eyes exhibited severe myopia of -11.94 diopters (p<0.001) and refractive changes were mainly related with axial elongations. Refractive error of 1000 lux group was less myopic than 2000 lux group (p<0.05). The fellow eyes didn't show significant difference between groups. No significant changes were noted between different light source groups. The experiment suggests that different degrees of illumination under normal light/dark environment can cause different refractive changes; More studies will be needed to show that the ideal luminance condition for emmetropization in our enviroment be present.
