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Fig. 3 | Eye and Vision

Fig. 3

From: The art of nomograms

Fig. 3

Achieved correction vs. Attempted correction with Nomogram 3. The achieved spherical equivalent change correlated with the attempted change (p < 0.0001), and the absolute magnitude of the achieved cylindrical change (vectorial analysis) with the attempted change (p < 0.0001). The nomogram correction differs significantly from the preoperative refraction for sphere (p < 0.0001) but not for astigmatism (p = 0.3). The nomogram proposes a − 5% reduction in sphere with a − 0.41 D bias, and a + 1% enhancement of the cylinder. A refraction of − 2.50 D sphere with − 1.50 D astigmatism at 63 degrees should be planned as − 2.75 D sphere with − 1.52 D astigmatism at 63 degrees

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