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The study of corneal topography in myopic and hyperopic children
Lei Gao1, Xuying Zhuo, Lusheng Ma
1Department of Ophthalmology, Yantai Yuhuangding Hospital Affiliated Hospital of Medical College, Qingdao University, Yantai 264000, Shadong Province, China. gl6365@yahoo.com.cn
Purpose:
To compare the differences of corneal topographies in myopic and hyperopic children and study the effect of Atropin on their changes.
Methods:
The refractive components of 136 eyes with different refractive conditions were measured with A-Scan and their corneal topographies with and without cycloplegia were obtained respectively.
Results:
The mean corneal power of zones 3mm (MD3, P=0.031) and minor keratometer K2 (P=0.003) of myopia are greater than those of hyperopia without cycloplegia. MD3 (P=0.009) and Keratometer K1 (P = 0.025) increased in hyperopic eyes, while MD3 (P=0.033), K1 (P = 0.035) and K2 (P = 0.002) decreased in myopic eyes significantly after cycloplegia. Similarly, the mean corneal power of zones 5mm (MD5) and 7mm (MD7) in myopic eyes decreased dramatically (P < or = 0.001).
Conclusions:
The corneal power was found to be greater in myopia than that in hyperopia. The effect of Atropin on corneal shape of myopia and hyperopia was in the opposite direction.
