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[Contrast sensitivity after laser in situ keratomileusis for myopia (LASIK-M)]
Cardona Ausina C1, Pérez Santonja JJ, Ayala Espinosa MJ
1Unidad de Cirugía Refractiva y Córnea, Instituto Oftalmológico de Alicante, Universidad Miguel Hernández, Alicante, España.
Purpose:
To evaluate the effect of laser in situ keratomileusis for the correction of moderate myopia (LASIK) on contrast sensitivity values.
Methods:
Seventeen eyes of 10 patients underwent LASIK to correct myopia ranging from 7.75 to -4.75 D (mean +/- SD, -6.53 +/- 0.99 D). Contrast sensitivity was tested preoperatively and 1, 3, 6 and 12 months postoperatively using the CVS -1000 contrast sensitivity test (Vector Vision).
Results:
Contrast sensitivity decreased in the first postoperative month, the decrease was significant for 6 dg and 12 c/g (P -0.006 and P=0.005, respectively). At 3 months it returned to preoperative values although it was not statistically significant (P>0.05). There was an improvement at 6 months at spatial frequencies of 3 c/g and 6 c/g and at 12 months the improvement was for 3, 6 and 18 c/g, although the changes were not significant.
Conclusion:
Although LASIK decreased contrast sensitivity values at one month after surgery, these values returned to the preoperative levels at 3 months. The improvement at certain frequencies at 6 and 12 months suggests that LASIK can improve the quality of vision in eyes with low to moderate myopia.