2008 Volume 29 Issue 1 Pages 32-35
We analyzed the relationship between subjective and objective refractions preoperatively and at 6 months after myopic laser in situ keratomileusis (LASIK) in 30 eyes of 15 patients aged 22 to 39 years (mean ± standard deviation, 29 ± 5). The amount of correction was −1.5～−8.38D (mean ± standard deviation, −4.09 ± 1.89D). Subjective refraction was measured by the second method of subjective refraction. Non-cycloplegic and cycloplegic objective refraction were measured by autorefractometer and aberrometer. Corneal and ocular aberrations for 4 and 6 mm diameter pupil were measured by aberrometer. There was no significant difference between refraction values preoperatively. Postoperatively, the order from plus to minus was as follows: cycloplegic autorefraction, subjective refraction, cycloplegic refraction for 4 mm pupil measured by aberrometer, noncycloplegic autorefraction and cycloplegic refraction for 6 mm pupil measured by aberrometer. Cycloplegic autorefraction and subjective refraction were significantly more positive or less negative than noncycloplegic autorefraction. It is suggested that after myopic LASIK, measurement through a wider pupil area results in more negative value of refraction, being affected by spherical-like aberration.
