Effect of myopic LASIK on human corneal sensitivity.
OBJECTIVE
To evaluate the changes in corneal sensitivity after LASIK for the correction of different degrees of myopia.


METHODS
Prospective, nonrandomized, comparative self-controlled trial.


METHODS
One hundred two myopic eyes of 58 patients were included in this study.


METHODS
The eyes were divided into four groups: group 1, from -0.75 to -3.75 diopters (D); group 2, from -4.00 to -7.75 D; group 3, from -8.00 to -11.75 D; group 4, from -12.00 to -16.00 D. Corneal sensitivity was measured before and 1, 7, 30, 90, 180, 270, and 365 days after surgery or until full recovery.


METHODS
The recovery of corneal sensation after LASIK.


RESULTS
Immediately after surgery, the lenticule was found to be completely anesthetic, and the full recovery varied according to the depth of the ablation. Normal levels of corneal sensitivity, but not full recovery, were found after 90 days in groups 1 and 2 and after 180 days in groups 3 and 4. Full recovery of corneal sensitivity was found after 180 days in groups 1 and 2 and after 270 days in groups 3 and 4.


CONCLUSIONS
After LASIK, corneal sensitivity is decreased at the central and paracentral areas for as long as 9 months. The depth of the ablation seems to be an important factor in the temporary decrease of corneal sensitivity and its recovery.
Nassaralla
Belquiz A
BA
Department of Cornea and Refractive Surgery, Goiânia Eye Institute, Rua L no 523#12 andar, Setor Oeste, Goiânia, Goiás, Brazil, ZC.
McLeod
Stephen D
SD
Nassaralla
João J
JJ
D000293:Adolescent; D000328:Adult; D003315:Cornea / Q000503:physiopathology; D003316:Corneal Diseases / Q000209:etiology* / Q000503:physiopathology; D005260:Female; D006801:Humans; D020731:Keratomileusis, Laser In Situ / Q000009:adverse effects*; D008297:Male; D008875:Middle Aged; D009216:Myopia / Q000503:physiopathology / Q000601:surgery*; D011446:Prospective Studies; D020127:Recovery of Function; D012677:Sensation / Q000502:physiology; D012678:Sensation Disorders / Q000209:etiology* / Q000503:physiopathology; D013997:Time Factors