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M.G. Rego, A.J. Rodovalho, J. Nassaralla, B.A. Nassaralla; Corneal Sensivity and Tear Secretion after LASIK . Invest. Ophthalmol. Vis. Sci. 2003;44(13):2456.
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Purpose: To evaluate the changes in corneal sensitivity and tear secretion after laser in situ keratomileusis (LASIK). Methods: A total of thirty-eight eyes of nineteen patients, 9 men and 10 women, submitted to myopic LASIK surgery were studied. The mean spherical equivalent before surgery was –3,79D (± 1,29). Corneal sensitivity was tested using Cochet-Bonnet esthesiometer in the central cornea. Tear secretion and tear film instability were tested using Schirmer test values, tear break-up time and basal tear secretion test. Examinations were performed preoperatively and 7, 30, 90,180 and 270 days postoperatively or until recovery of the preoperative values. Results: Median preoperative corneal sensitivity was 60mm (range, 50 to 60mm); median Schirmer test was 21,5 mm (range, 10 to 30mm); median basal secretion was 11,5 mm (range, 6 to 20mm); median break-up time test was 16,0 seconds (range, 8 to 22 seconds). Corneal sensitivity and tear secretion returned to their preoperative values between 90 to 180 days after surgery. During the follow-up, 5 patients (10 eyes) did not present any dry eye symptom. Conclusions: It was found that corneal sensitivity and tear secretion are decreased as long as 6 months after LASIK. When 73,6% of the cases had symptoms of dry eye during the follow up. Further investigations are advisable to best evaluate effects in the corneal physiology after LASIK.
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