Corneal topography is a useful investigation in the preoperative cataract surgery planning, becoming mandatory when full refractive outcome is required. Evaluation of corneal power, corneal astigmatism and its management are pivotal to both exclude ectasia, assess the corneal shape and for patient selection. This paper reviews the principles of successive generations of topographers and illustrates several normal and abnormal corneal topographies giving useful indications for refractive cataract surgery.
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