June 1993
Volume 34, Issue 7
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Articles  |   June 1993
Optical zone diameters for photorefractive corneal surgery.
Author Affiliations
  • C W Roberts
    Department of Ophthalmology, Cornell University Medical College, New York, NY 10021.
  • C J Koester
    Department of Ophthalmology, Cornell University Medical College, New York, NY 10021.
Investigative Ophthalmology & Visual Science June 1993, Vol.34, 2275-2281. doi:
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    • Get Citation

      C W Roberts, C J Koester; Optical zone diameters for photorefractive corneal surgery.. Invest. Ophthalmol. Vis. Sci. 1993;34(7):2275-2281.

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      © ARVO (1962-2015); The Authors (2016-present)

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Abstract

PURPOSE: To examine the physiological optics of photorefractive corneal surgery and to study the effect on glare production of the optical zone diameter. METHODS: An optical analysis computer program was used to generate rays that define the edge of the optical zone for any given pupil size and glare-free field. RESULTS: The optical zone diameter must be based on the postoperative corneal curvature because the determines magnification of the pupil. The minimal optical zone diameter of uniform optical power was determined both for myopic and hyperopic surgery and for two values of anterior chamber depth. CONCLUSIONS: Optical zone diameters must be at least as large as the entrance pupil diameter to preclude glare at the fovea, and larger than the entrance pupil to preclude parafoveal glare.

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