title: The study of corneal topography in myopic and hyperopic children.
abstract: OBJECTIVE
  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.
authors.affiliation: Department of Ophthalmology, Yantai Yuhuangding Hospital Affiliated Hospital of Medical College, Qingdao University, Yantai 264000, Shadong Province, China. gl6365@yahoo.com.cn
authors.forename: Lei
authors.initials: L
authors.lastname: Gao
authors.forename: Xuying
authors.initials: X
authors.lastname: Zhuo
authors.forename: Lusheng
authors.initials: L
authors.lastname: Ma
authors.forename: Ning
authors.initials: N
authors.lastname: Yu
authors.forename: Zhonghao
authors.initials: Z
authors.lastname: Wang
authors.forename: Pengfei
authors.initials: P
authors.lastname: Jiang
mesh_terms: D000065:Accommodation, Ocular / Q000502:physiology; D000293:Adolescent; D001285:Atropine / Q000627:therapeutic use*; D002648:Child; D003315:Cornea / Q000187:drug effects / Q000473:pathology* / Q000503:physiopathology; D019781:Corneal Topography / Q000379:methods*; D005260:Female; D006801:Humans; D006956:Hyperopia / Q000473:pathology* / Q000503:physiopathology; D008297:Male; D009216:Myopia / Q000473:pathology* / Q000503:physiopathology; D012029:Refraction, Ocular / Q000502:physiology
chemical_list: D001285:Atropine