Topography has become an indispensable tool in cataract surgery. Originally developed for keratorefractive procedures, it is now used to determine candidacy for corneal as well as cataract procedures. Preoperatively, it was used to determine if the keratometry readings are appropriate for excimer ablation of the patient’s refractive error, and to rule out ectatic changes prior to surgery. As refractive surgery expanded to include lenticular procedures and premium lenses, the technology grew. Topography is now used to assess corneal shape, regular astigmatism for toric IOL implantation, corneal spherical aberration for aspheric IOL implantation, and alignment.
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