The curvature measurement of the human eyeball

The curvature of the cornea in the ophthalmology field is essential data, especially for humans when they are being tested for wearing contact lenses, or for patients undergoing refractive surgery by either knife or laser. It is extremely difficult to measure the curvature of the eye precisely becau...

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Bibliographic Details
Published in:Optics and laser technology 1997-09, Vol.29 (6), p.339-344
Main Authors: Lay, Yun Long, Chang, Rong Seng, Chen, Pei-Wen, Tu, Ming-Chang
Format: Article
Language:English
Subjects:
Aberrations
Biological and medical sciences
Contact lenses
curvature
Diffraction gratings
distortion aberration
Exact sciences and technology
Fundamental areas of phenomenology (including applications)
Image forming and processing
Image processing
Imaging and optical processing
Investigative techniques, diagnostic techniques (general aspects)
Laser surgery
Medical sciences
Ophthalmology
Optics
Pathology. Cytology. Biochemistry. Spectrometry. Miscellaneous investigative techniques
Physics
Placido disc
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Summary:The curvature of the cornea in the ophthalmology field is essential data, especially for humans when they are being tested for wearing contact lenses, or for patients undergoing refractive surgery by either knife or laser. It is extremely difficult to measure the curvature of the eye precisely because the measurement of the cornea, using a contact tool, is not possible. In this paper, we propose a method to measure the curvature using lens aberration theory and an image processing technique. We project a circular grating, known as a Placido disc, on to the cornea. The reflective image does not have equal divisions and this distortion value contains the curvature information.
ISSN:0030-3992
1879-2545
DOI:10.1016/S0030-3992(97)00008-X