Posterior corneal curvature measurements with peripheral fitting zones before and after myopic LASIK using Orbscan II.
To compare pre- and postoperative posterior corneal curvature measurements in peripheral fitting zones using the Orbscan II topographer in patients undergoing myopic LASIK.



Retrospective analysis of preoperative and 3-month postoperative Orbscan II data of 194 eyes that underwent myopic LASIK at a university eye center. Posterior corneal power was estimated using the peripheral 7- to 10-mm fitting zones. The pre- and postoperative values were analyzed and compared.



The mean difference in estimated pre- and postoperative power of the posterior cornea was -0.04 +/- 0.16 diopters (P < .01).



The difference in posterior corneal curvature measurement following myopic LASIK using the peripheral fitting zone with the Orbscan II, as compared to the preoperative values, is clinically insignificant.
Dept of Ophthalmology, Hong Kong Sanatorium & Hospital, 5/F Central Block, 2 Village Rd, Happy Valley, Hong Kong. artcheng@netvigator.com
Arthur C K
AC
Cheng
Thomas
T
Ho
Srinivas K
SK
Rao
Silvania
S
Lau
Dennis S C
DS
Lam
D000293:Adolescent; D000328:Adult; D000886:Anthropometry; D001837:Body Weights and Measures; D003315:Cornea / Q000473:pathology*; D019781:Corneal Topography / Q000379:methods; D006801:Humans; D020731:Keratomileusis, Laser In Situ / Q000379:methods*; D054018:Lasers, Excimer / Q000627:therapeutic use*; D008875:Middle Aged; D009216:Myopia / Q000601:surgery*; D011182:Postoperative Care; D011300:Preoperative Care; D013524:Surgical Flaps