Skip to main content
Fig. 2 | Eye and Vision

Fig. 2

From: The art of nomograms

Fig. 2

Achieved correction vs. Attempted correction with Nomogram 2. The achieved spherical change (considering astigmatism as a positive convention) correlated with the attempted change (p < 0.0001), and the magnitude of the achieved cylindrical change (vectorial analysis with astigmatism as a positive convention) with the attempted change (p < .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 − 4% reduction in sphere with a − 0.39 D bias and a + 1% enhancement of the cylinder. A refraction of − 4.00 D sphere with + 1.50 D astigmatism at 153 degrees (− 2.50 D sphere with − 1.50 D astigmatism at 63 degrees) should be planned as − 4.25 D sphere with + 1.52 D astigmatism at 153 degrees (− 2.73 D sphere with − 1.52 D astigmatism at 63 degrees)

Back to article page