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Is "whole eye" wavefront analysis helpful to corneal refractive therapy?
Charlotte E Joslin1, Shelley M Wu, Timothy T McMahon
1Department of Ophthalmology and Visual Sciences, University of Illinois at Chicago, 1855 West Taylor Street, Suite 3.164, Chicago, IL 60612, USA. charjosl@uic.edu
Eye & Contact Lens
|October 23, 2004
Summary
Corneal refractive therapy (CRT) increases both corneal and whole eye spherical aberration. Whole eye analysis is crucial as CRT impacts the entire optical system, not just the cornea.
Area of Science:
- Ophthalmology
- Optometry
- Vision Science
Background:
- Corneal refractive therapy (CRT) is a non-surgical method to correct myopia.
- Spherical aberration (Z4) is a key optical parameter affecting visual quality.
- Understanding the impact of CRT on ocular aberrations is vital for optimizing visual outcomes.
Purpose of the Study:
- To investigate how CRT influences the balance between corneal and whole eye spherical aberration.
- To determine if corneal aberrations alone can predict the optical results of CRT.
Main Methods:
- Measured whole eye and corneal spherical aberrations before and after CRT in 12 myopic eyes.
- Utilized Shack-Hartmann aberrometry for whole eye aberrations and Keratron topography for corneal aberrations.
- Scaled aberrations for a 6-mm pupil diameter.
Main Results:
- No significant correlation between corneal and whole eye spherical aberration was observed at baseline.
- CRT led to an increase in both corneal and whole eye spherical aberration in all eyes.
- A significant positive correlation (R = 0.632, P = 0.004) was found post-CRT, with whole eye aberration exceeding corneal aberration.
Conclusions:
- Whole eye wavefront analysis is essential for optimizing visual performance with CRT.
- CRT affects the entire optical system, not solely the anterior corneal surface.
- The mechanism of CRT may involve more than just corneal tissue redistribution.