Post-PRK corneal scatter measurements with a scanning confocal slit photon counter

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

doi:10.1117/12.387510

7 June 2000 Post-PRK corneal scatter measurements with a scanning confocal slit photon counter

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

Author Affiliations +

Proceedings Volume 3908, Ophthalmic Technologies X; (2000) https://doi.org/10.1117/12.387510
Event: BiOS 2000 The International Symposium on Biomedical Optics, 2000, San Jose, CA, United States

Abstract

Increased corneal light scatter or 'haze' has been associated with excimer laser photorefractive surgery of the cornea. The increased scatter can affect visual performance; however, topical steroid treatment post surgery substantially reduces the post PRK scatter. For the treatment and monitoring of the scattering characteristics of the cornea, various methods have been developed to objectively measure the magnitude of the scatter. These methods generally can measure scatter associated with clinically observable levels of haze. For patients with moderate to low PRK corrections receiving steroid treatment, measurement becomes fairly difficult as the haze clinical rating is non observable. The goal of this development was to realize an objective, non-invasive physical measurement that could produce a significant reading for any level including the background present in a normal cornea. As back-scatter is the only readily accessible observable, the instrument is based on this measurement. To achieve this end required the use of a confocal method to bias out the background light that would normally confound conventional methods. A number of subjects with nominal refractive errors in an Air Force study have undergone PRK surgery. A measurable increase in corneal scatter has been observed in these subjects whereas clinical ratings of the haze were noted as level zero. Other favorable aspects of this back-scatter based instrument include an optical capability to perform what is equivalent to an optical A-scan of the anterior chamber. Lens scatter can also be measured.

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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, Jose Perez, Thomas Tredici, and Dan A. Johnson "Post-PRK corneal scatter measurements with a scanning confocal slit photon counter", Proc. SPIE 3908, Ophthalmic Technologies X, (7 June 2000); https://doi.org/10.1117/12.387510

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