Abstract
This chapter describes a new rasterstereographic method that can utilize either a modified slit lamp or operating room microscope. A grid is projected onto the cornea through a cobalt blue filter, and the tear film is stained with sodium fluorescein. The fluorescein is excited by the blue light, causing a grid pattern to become visible on the surface of the cornea. This corneal surface grid pattern is imaged by a video camera attached to the slit-lamp operating microscope. The video image is digitized by a digital image processor that utilizes the grid pattern to calculate the corneal topography. Unlike methods based on the Placedo disk, this system provides information across the full corneal diameter, including the optical axis, and extending onto the sclera, and this method is not affected by corneal surface or stromal defects.
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© 1992 Springer-Verlag New York Inc.
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Warnicki, J.W., Rehkopf, P.G., Arffa, R.C., Stuart, J.C. (1992). Corneal Topography Using a Projected Grid. In: Schanzlin, D.J., Robin, J.B. (eds) Corneal Topography. Springer, New York, NY. https://doi.org/10.1007/978-1-4612-2766-3_3
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DOI: https://doi.org/10.1007/978-1-4612-2766-3_3
Publisher Name: Springer, New York, NY
Print ISBN: 978-1-4612-7659-3
Online ISBN: 978-1-4612-2766-3
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