Detecting Irregular Astigmatism or Other Abnormalities. Corneal topography, especially photokeratoscope view and tangential map, plays a critical role in the detection of corneal irregular ...

Topography accurately measures the global corneal astigmatism, quantifies the nature of the astigmatism (i.e., symmetric 'bow tie' vs asymmetric or 'irregular' astigmatism) and identifies the ...