Chinese Journal of Tissue Engineering Research ›› 2012, Vol. 16 ›› Issue (33): 6199-6205.doi: 10.3969/j.issn.2095-4344.2012.33.024

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Orbscan Ⅱ versus Pentacam anterior eye segment analysis systems for measurement of corneal power before and after refractive surgery

Yang Lei1, Guo Hai-ke2, Zeng Jin2   

  1. 1Department of Ophthalmology, Wuhan General Hospital of Guangzhou Military Area Command of Chinese PLA, Wuhan 430070, Hubei Province, China;
    2Eye Disease Prevention and Cure Institute, Guangdong Provincial People’s Hospital, Guangzhou 510030, Guangdong Province, China
  • Received:2012-05-07 Revised:2012-05-17 Online:2012-08-12 Published:2012-08-12
  • Contact: Guo Hai-ke, Doctor, Professor, Chief physician, Eye Disease Prevention and Cure Institute, Guangdong Provincial People’s Hospital, Guangzhou 510030, Guangdong Province, China guohaike@hotmail.com.cn
  • About author:杨磊☆，女，1976年生，天津市人，汉族，2000年华中科技大学毕业，博士，主治医师，主要从事白内障和屈光方面的研究。 shitouyang@126.com

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Abstract:

BACKGROUND: Orbscan Ⅱ anterior eye segment analysis system and Pentacam anterior eye segment analysis system can both measure the cornea power before and after refractive surgery. But the consistency and accuracy of the two mentioned above remain unclear.
OBJECTIVE: Using the two kinds of anterior eye segment analysis systems to measure the cornea power before and after refractive surgery, and to analyze the reliability of the two instruments and the effect of corneal refractive surgery on morphology of posterior corneal surface.
METHODS: Sixty-nine cases of myopia (136 eyes) who were continuously treated in the Refractive Surgery Center of Peoples Hospital of Guangdong Province from 2010-02/04 were included. Thirty-three cases (65 eyes) received laser in situ keratomileusis (LASIK) and 36 cases (71 eyes) underwent laser subepithelial keratomileusis (LASEK). Then, Orbscan Ⅱ and Pentacam anterior eye segment analysis systems were used to measure posterior and anterior corneal power.
RESULTS AND CONCLUSION: There was a significant difference in anterior/posterior corneal power measurements between the two instruments. The consistency was well. OrbscanⅡ found that posterior coneal power became smaller after LASIK/LASEK; while Pentacam found no significant difference. There was a linear correlation between the change values of posterior cornear power and residual bed thickness. These findings suggest that the results measured by Orbscan Ⅱ and Pentacam anterior eye segment analysis systems cannot replace each other. For posterior corneal power, Pentacam anterior eye segment analysis system showed low measurements before refractive surgery, but the measurements were converse after refractive surgery. Besides, Orbscan Ⅱ found posterior surface protrusion, but Pentacam did not.

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