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Proceedings Paper

Automated ocular wavefront analyzer for clinical use
Author(s): Peter Mierdel; Maik Kaemmerer; Michael Mrochen; Hans-Eberhard Krinke; Theo Seiler
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Paper Abstract

Higher-order optical errors of the human eye are often responsible for a reduced visual acuity in spite of an optimal spherical or cylindrical refraction. These optical aberrations are of natural origin or can result from operations in the eye involving optical structures. The presented wavefront analyzer bases on Tscherning's aberroscope. A collimated laser beam (532 nm, 10 mW) illuminates a mask with a regular matrix of 0.3 mm diameter holes which forms a bundle of thin parallel rays. These rays are focused by a lens in front of the eye that their intraocular focus point is located in a certain distance in front of the retina generating a corresponding pattern of light spots on it. According to the existing ocular optical errors, this spot pattern is more or less distorted in comparison to the mask matrix. For a 6 mm pupil diameter 68 retinal spots are plottable for the assessment of optical aberrations. The retinal spot pattern is imaged onto the sensor of a low-light CCD video camera by indirect ophthalmoscopy. The deviations of all spots from their ideal regular positions are measured by means of a PC, and from these values the intraocular wave-front aberration is computed in the form of Zernike polynomials up to the 6th order.

Paper Details

Date Published: 7 June 2000
PDF: 7 pages
Proc. SPIE 3908, Ophthalmic Technologies X, (7 June 2000); doi: 10.1117/12.387531
Show Author Affiliations
Peter Mierdel, Univ. of Dresden (Germany)
Maik Kaemmerer, Univ. of Dresden (Germany)
Michael Mrochen, Univ. of Dresden (Switzerland)
Hans-Eberhard Krinke, Univ. of Dresden (Germany)
Theo Seiler, Univ. of Dresden (Germany)

Published in SPIE Proceedings Vol. 3908:
Ophthalmic Technologies X
Pascal O. Rol; Karen Margaret Joos M.D.; Fabrice Manns, Editor(s)

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