title: Biometry and corneal astigmatism in cataract surgery candidates from Southern China.
abstract: OBJECTIVE
  To analyze biometry data and corneal astigmatism in cataract candidates from Southern China.
  
  
  METHODS
  Guangdong Eye Institute, Guangdong General Hospital, Guangzhou, China.
  
  
  METHODS
  Cross-sectional hospital-based study.
  
  
  METHODS
  The axial length (AL), anterior chamber depth (ACD), horizontal corneal diameter (white to white [WTW]), and corneal power (keratometry [K], flat K, steep K) were measured using the IOLMaster system. Ocular biometric data were collected and analyzed between 2007 and 2011.
  
  
  RESULTS
  The study comprised 6750 eyes of 4561 consecutive cataract candidates with a mean age of 70.4 years ± 10.5 (SD). The mean AL, ACD, and WTW were 24.07 ± 2.14 mm, 3.01 ± 0.57 mm, and 11.68 ± 0.45 mm, respectively. All values were statistically significantly greater in men than in women (P < .001) and had a significant trend toward a decrease as age increased (P < .001). The mean K value was 44.13 ± 1.63 D. The median corneal astigmatism was 0.90 D (interquartile range, 0.54-1.43). Corneal astigmatism of 1.00 D or greater was found in 2963 eyes (43.9%), and 3590 eyes (53.2%) had against-the-rule (ATR) astigmatism. The axis of corneal astigmatism turned in the ATR direction with age.
  
  
  CONCLUSIONS
  This study provides reference data for cataract patients from Southern China. The profiles of ocular biometric data and corneal astigmatism can help improve surgical procedures and intraocular lens design for the Chinese population.
  
  
  BACKGROUND
  No author has a financial or proprietary interest in any material or method mentioned.
authors.affiliation: From Guangdong Eye Institute (Cui, Meng, Guo, Zeng, H. Zhang, Huang, Lan), Department of Ophthalmology, and the Health Management Center (G. Zhang), Guangdong General Hospital, Guangdong Academy of Medical Sciences, Guangzhou, China.
authors.forename: Ying
authors.initials: Y
authors.lastname: Cui
authors.affiliation: From Guangdong Eye Institute (Cui, Meng, Guo, Zeng, H. Zhang, Huang, Lan), Department of Ophthalmology, and the Health Management Center (G. Zhang), Guangdong General Hospital, Guangdong Academy of Medical Sciences, Guangzhou, China.
authors.forename: Qianli
authors.initials: Q
authors.lastname: Meng
authors.affiliation: From Guangdong Eye Institute (Cui, Meng, Guo, Zeng, H. Zhang, Huang, Lan), Department of Ophthalmology, and the Health Management Center (G. Zhang), Guangdong General Hospital, Guangdong Academy of Medical Sciences, Guangzhou, China. Electronic address: guohaike2013@163.com.
authors.forename: Haike
authors.initials: H
authors.lastname: Guo
authors.affiliation: From Guangdong Eye Institute (Cui, Meng, Guo, Zeng, H. Zhang, Huang, Lan), Department of Ophthalmology, and the Health Management Center (G. Zhang), Guangdong General Hospital, Guangdong Academy of Medical Sciences, Guangzhou, China.
authors.forename: Jin
authors.initials: J
authors.lastname: Zeng
authors.affiliation: From Guangdong Eye Institute (Cui, Meng, Guo, Zeng, H. Zhang, Huang, Lan), Department of Ophthalmology, and the Health Management Center (G. Zhang), Guangdong General Hospital, Guangdong Academy of Medical Sciences, Guangzhou, China.
authors.forename: Hongyang
authors.initials: H
authors.lastname: Zhang
authors.affiliation: From Guangdong Eye Institute (Cui, Meng, Guo, Zeng, H. Zhang, Huang, Lan), Department of Ophthalmology, and the Health Management Center (G. Zhang), Guangdong General Hospital, Guangdong Academy of Medical Sciences, Guangzhou, China.
authors.forename: Guanrong
authors.initials: G
authors.lastname: Zhang
authors.affiliation: From Guangdong Eye Institute (Cui, Meng, Guo, Zeng, H. Zhang, Huang, Lan), Department of Ophthalmology, and the Health Management Center (G. Zhang), Guangdong General Hospital, Guangdong Academy of Medical Sciences, Guangzhou, China.
authors.forename: Yu
authors.initials: Y
authors.lastname: Huang
authors.affiliation: From Guangdong Eye Institute (Cui, Meng, Guo, Zeng, H. Zhang, Huang, Lan), Department of Ophthalmology, and the Health Management Center (G. Zhang), Guangdong General Hospital, Guangdong Academy of Medical Sciences, Guangzhou, China.
authors.forename: Jianqing
authors.initials: J
authors.lastname: Lan
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D000867:Anterior Chamber / Q000473:pathology; D044466:Asian People; D001251:Astigmatism / Q000175:diagnosis*; D058452:Axial Length, Eye / Q000473:pathology; D001699:Biometry; D002386:Cataract / Q000175:diagnosis*; D002681:China; D003315:Cornea / Q000473:pathology*; D003430:Cross-Sectional Studies; D005260:Female; D006801:Humans; D019654:Lens Implantation, Intraocular; D008297:Male; D008875:Middle Aged; D018918:Phacoemulsification