[Calculation of corneal curvature after laser in situ keratomileusis for correction of myopia].
OBJECTIVE
To describe and evaluate a refraction-derived method and a clinical-derived method to calculate the correct corneal curvature for intraocular lens (IOL) power calculations after laser in situ keratomileusis (LASIK) and to compare the results to the commonly used history-derived method.


METHODS
Retrospective analysis of consecutive case treated with LAIK clinically. We measured pre-LASIK and post-LASIK spectacle refraction, pre-LASIK and post-LASIK K readings in each patient. We then calculated pre- and post-LASIK refraction at the corneal plane and the amount of correction obtained by the refraction surgery. Patients were divided into two groups. Group I was used to establish the two different formulas for the refraction- and clinical-derived methods. The values obtained with these two methods were compared with the K by history-derived method (Kc. hd) in group II to validate the results.


RESULTS
The K values calculated using the refraction-derived method and clinical-derived method were correlated significantly with that obtained from Kc. hd.


CONCLUSIONS
The calculation of corneal curvature for intraocular lens (IOL) power calculation after LASIK can use the refraction- and clinical-derived methods instead of history-derived method when some refractive parameters are not available.
Department of Ophthalmology, Tongji Hospital Affiliated to Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, China.
Lei
L
Liu
Jie-yu
JY
Dong
Xin-yu
XY
Li
Ming
M
Huo
D000293:Adolescent; D000328:Adult; D000465:Algorithms; D003315:Cornea / Q000473:pathology*; D005260:Female; D006801:Humans; D020731:Keratomileusis, Laser In Situ; D007910:Lenses, Intraocular; D008297:Male; D008875:Middle Aged; D009216:Myopia / Q000601:surgery; D011184:Postoperative Period; D012029:Refraction, Ocular; D012189:Retrospective Studies; D055815:Young Adult