Contrast sensitivity after laser in situ keratomileusis

Area of Science:

• Ophthalmology
• Refractive Surgery
• Visual Optics

Background:

• Myopia correction is a common goal in refractive surgery.
• Laser in situ keratomileusis (LASIK) is a widely used procedure for myopia correction.
• Assessing the impact of LASIK on visual function, particularly contrast sensitivity, is crucial.

Purpose of the Study:

• To evaluate the effect of LASIK on contrast sensitivity function in patients undergoing myopia correction.
• To determine the temporal changes in contrast sensitivity following LASIK surgery.

Main Methods:

• The study included 10 patients (14 eyes) with myopia ranging from 6.00 to 19.50 diopters.
• Contrast sensitivity was measured preoperatively and at 1, 3, and 6 months post-LASIK using the CVS-1000E contrast sensitivity unit.
• Statistical analysis was performed to assess changes in contrast sensitivity at various spatial frequencies.

Main Results:

• A significant decrease in contrast sensitivity was observed at 1 month post-LASIK, primarily at low and intermediate spatial frequencies (3 and 6 cycles per degree).
• Contrast sensitivity rapidly recovered to preoperative levels by 3 months post-surgery.
• At 6 months, an non-significant increase in contrast sensitivity was noted at specific spatial frequencies (3, 12, and 18 cycles per degree).

Conclusions:

• LASIK surgery can cause a temporary reduction in contrast sensitivity at certain spatial frequencies in the initial postoperative period.
• Contrast sensitivity function generally returns to baseline levels within three months after LASIK for myopia.
• The findings suggest that LASIK may improve overall visual quality in individuals with moderate to high myopia.