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Principles of Tscherning aberrometry
M Mrochen1, M Kaemmerer, P Mierdel
1Department of Ophthalmology at the University of Zurich, Switzerland. michaelmrochen@aug.usz.ch
Journal of Refractive Surgery (Thorofare, N.J. : 1995)
|October 6, 2000
Summary
This study introduces a wavefront analyzer to measure higher-order optical aberrations in the human eye. It precisely quantifies visual errors beyond standard refraction, aiding in understanding reduced visual acuity.
Area of Science:
- Ophthalmology
- Optical Engineering
- Biomedical Optics
Background:
- Higher-order optical errors significantly impact visual acuity, even with corrected refractive errors.
- These aberrations can be intrinsic or induced by ocular procedures.
Purpose of the Study:
- To present a novel wavefront analyzer for quantifying higher-order optical aberrations.
- To assess the capability of the device in measuring complex visual errors.
Main Methods:
- Utilized Tscherning's aberroscope principle with a laser and pinhole mask to generate parallel light rays.
- Recorded the distorted retinal spot pattern using indirect ophthalmoscopy and a low-light CCD camera.
- Employed computer analysis to measure spot deviations and compute aberrations via Zernike polynomials up to the 8th order.
Main Results:
- The system successfully measures retinal spot pattern distortions caused by optical errors.
- Aberrations are computed using Zernike polynomials, providing detailed optical error information.
- The device quantifies higher-order aberrations beyond standard spherical and cylindrical correction.
Conclusions:
- The developed wavefront analyzer effectively measures higher-order optical aberrations.
- This technology offers a precise method for diagnosing visual disturbances linked to optical errors.
- Potential applications include improved ophthalmic diagnostics and personalized vision correction.
