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.
Cheng
Arthur C K
AC
Dept of Ophthalmology, Hong Kong Sanatorium & Hospital, 5/F Central Block, 2 Village Rd, Happy Valley, Hong Kong. artcheng@netvigator.com
Ho
Thomas
T
Rao
Srinivas K
SK
Lau
Silvania
S
Lam
Dennis S C
DS
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