Figure 2 | Scientific Reports

Figure 2

From: Calculation of the total corneal astigmatism using the virtual cross cylinder method on the secondary principal plane of the cornea

Figure 2

(a) A virtual cross cylinder for anterior corneal astigmatism with axis α. The power profile is expressed as FACA(φ) =  − 0.5 × ACA × cos2(φ – α). (b) A virtual cross cylinder for posterior corneal astigmatism with axis β. The power profile is expressed as FPCA(φ) =  − 0.5 × PCA × cos2(φ – β). ACA magnitude of the anterior corneal astigmatism, PCA magnitude of the posterior corneal astigmatism.

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