Fig. 2From: Analysis of total corneal astigmatism with a rotating Scheimpflug camera in keratoconusMean corneal astigmatisms represented on double-angle polar plots by total corneal refractive power (TCRP). a 2.0 mm–5.0 mm zone centered on the pupil; (b) 2.0 mm–5.0 mm zone centered on the apex; (c) 2.0 mm–5.0 mm ring centered on the pupil; (d) 2.0 mm–5.0 mm ring centered on the apexBack to article page