Scanning confocal slit photon counter measurements of post-PRK haze in two-year study

John Taboada; David Gaines; Mary Alice Perez; Steve G. Waller; Douglas J. Ivan; J. Bruce Baldwin; Frank LoRusso; Ronald C. Tutt; B. Thompson; Jose Perez; Thomas Tredici; Dan A. Johnson

doi:10.1117/12.429274

7 June 2001 Scanning confocal slit photon counter measurements of post-PRK haze in two-year study

John Taboada, David Gaines, Mary Alice Perez, Steve G. Waller, Douglas J. Ivan, J. Bruce Baldwin, Frank LoRusso, Ronald C. Tutt, B. Thompson, Jose Perez, Thomas Tredici, Dan A. Johnson

Author Affiliations +

Proceedings Volume 4245, Ophthalmic Technologies XI; (2001) https://doi.org/10.1117/12.429274
Event: BiOS 2001 The International Symposium on Biomedical Optics, 2001, San Jose, CA, United States

Abstract

In our study, a group of 80 United States Air Force, non- flying personnel will undergo photorefractive corneal surgery for moderate levels of myopia (< 6 diopters) and 20 will serve as controls. As of this report, approximately 56 have had the treatment. Of these, only about 59% of the treated eyes showed even a trace (.5) level of clinically assessed haze at any time. We report on the use of a recently developed instrument designed for the objective measurement of these low levels of haze in treated corneas. The sensitivity of the instrument is derived from the use of a scanning confocal slit photon counter. The use of a physical standard for calibration secures accuracy and reproducibility over an extensive period of time. Our haze measurements in this study revealed a very low level increase from baseline values for these patients. The typical increase over baseline was of the same magnitude as the variability in the observations, although the inherent variability in the measurements was approximately 0.25 times the value of the patient's haze variability.

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John Taboada, David Gaines, Mary Alice Perez, Steve G. Waller, Douglas J. Ivan, J. Bruce Baldwin, Frank LoRusso, Ronald C. Tutt, B. Thompson, Jose Perez, Thomas Tredici, and Dan A. Johnson "Scanning confocal slit photon counter measurements of post-PRK haze in two-year study", Proc. SPIE 4245, Ophthalmic Technologies XI, (7 June 2001); https://doi.org/10.1117/12.429274

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