Benjamin F. Boyd's Atlas of Refractive Surgery PDF

By Benjamin F. Boyd

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26): They are both contraindications for any refractive surgery. We must always be alert to detect a sub-clinical keratoconus. They are more definitively diagnosed through corneal topography, as presented later in this chapter. If not detected, a refractive surgery procedure may result in the development of ectasia because corneal stability has been affected. By all means, be on the lookout for these patients because, in addition to the possible development of ectasia, the results are unpredictable.

Artistically modified by HIGHLIGHTS with permission, from James P. ) Subjects 59 Index 1 60 2 3 4 5 (Figs. 30-34). The patient fixates the center of the disc (Figs. 30-34) and the equipment’s computer transforms the Placido disk image into a digitized map (Fig. 35). Recent developments have resulted in more sophisticated targets than the Placido disc. Most refractive surgeons, however, still prefer equipment based on the Placido disc. The Color Map Process in the Making A video camera takes an image of what is being reflected by the cornea.

Subjects Index 61 1 62 2 3 4 5 Unfortunately, in order to simplify their design, most present videokeratographs do not align on the CSC. This, fortunately, is usually of little clinical consequence in most cases. However, knowledge of the alignment process is necessary in order to properly interpret more complex corneas. In essence, the map provides a close estimate of the shape and refractive power of the cornea. The data is used to calculate the ablation needed in each area, but keep in mind that the data obtained is not perfect.

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Atlas of Refractive Surgery by Benjamin F. Boyd

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