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Optical quality analysis after surface excimer laser ablation: the relationship between wavefront aberration and
Yan Wang1, Jichang He, Zhao Kanxing
1Refractive Surgery Center, Tianjin Eye Institute and Hospital, Teaching Hospital of Tianjin Medical University, Tianjin, China. wangyan7143@vip.sina.com.cn
Journal of Refractive Surgery (Thorofare, N.J. : 1995)
|April 21, 2007
Summary
Corneal haze after photorefractive keratectomy (PRK) did not significantly alter higher order wavefront aberrations. This study found no predictable relationship between haze presence and changes in optical aberrations post-PRK.
Area of Science:
- Ophthalmology
- Optometry
- Vision Science
Background:
- Photorefractive keratectomy (PRK) is a common refractive surgery.
- Corneal haze is a potential complication following PRK.
- Higher order aberrations impact visual quality after refractive surgery.
Observation:
- This study compared wavefront aberrations in eyes with and without corneal haze post-PRK.
- Wavefront aberrations were measured using a psychophysical wavefront sensor and NIDEK OPD-Scan.
- Corneal topography, point spread function, and modulation transfer function maps were analyzed.
Findings:
- No statistically significant differences in total higher order aberrations were found between groups.
- Mild and moderate corneal haze did not predictably alter the magnitude or distribution of specific higher order aberrations like coma and spherical aberrations.
- Individual Zernike coefficients (Z-1, Z1, ZO) showed non-significant variations between the haze and control groups.
Implications:
- Corneal haze, within the mild to moderate range, may not be a primary driver of significant higher order wavefront aberrations after PRK.
- Further research may be needed to understand the complex interplay between corneal healing and visual optics post-PRK.
- These findings contribute to understanding visual outcomes and potential complications in refractive surgery patients.
