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Improved contrast sensitivity and visual acuity after wavefront-guided laser in situ keratomileusis: in-depth
Kuang-mon Ashley Tuan1, Junzhong Liang
1Visx, Inc., Advanced Medical Optics, Inc., Santa Clara, California 95051, USA. ashley.tuan@amoi-inc.com
Journal of Cataract and Refractive Surgery
|March 28, 2006
Summary
Wavefront-guided LASIK improved contrast sensitivity in myopic astigmatic eyes. While most patients had unchanged contrast sensitivity, significant improvements were noted across various conditions and spatial frequencies.
Area of Science:
- Ophthalmology
- Refractive Surgery
- Corneal Optics
Background:
- Laser in situ keratomileusis (LASIK) is a common refractive surgery.
- Wavefront-guided LASIK aims to improve visual quality beyond standard correction.
- Assessing contrast sensitivity is crucial for evaluating visual function after refractive surgery.
Purpose of the Study:
- To evaluate changes in contrast sensitivity and visual acuity after wavefront-guided LASIK.
- To assess the impact of the Visx CustomVue system on visual performance.
- To analyze contrast sensitivity under photopic, mesopic, and mesopic-with-glare conditions.
Main Methods:
- Retrospective analysis of data from 274 myopic astigmatic eyes across 6 clinical sites.
- Wavefront-guided LASIK performed using WaveScan aberrometer and Star S4 excimer laser.
- Contrast sensitivity and visual acuity measured preoperatively and over 6 months, controlling for pupil size and prior contact lens wear.
Main Results:
- Statistically significant improvements in contrast sensitivity at all spatial frequencies and lighting conditions (P<.05).
- 40% of patients showed improved contrast sensitivity under mesopic conditions with glare.
- Greater improvements observed at higher spatial frequencies (12, 18 cpd) compared to lower (3 cpd).
Conclusions:
- Wavefront-guided LASIK significantly improved corneal optical quality.
- Contrast sensitivity remained unchanged in most patients but improved significantly in a notable number.
- No correlation found between mesopic pupil size and contrast performance; spectacle wearers showed slightly better outcomes than soft contact lens wearers.
