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Table 1 Relative insensitivity of our mathematical formula to variations in axial length of the eye

From: Computing uveal melanoma basal diameters: a comparative analysis of several novel techniques with improved accuracy

Axial length Largest basal diameter (by length of single chord measurement)
6 mm 8 mm 10 mm 12 mm 14 mm 16 mm 18 mm
21.9 mm (− 2 SD) 6.08 8.19 10.38 12.70 15.19 17.94 21.13
22.8 mm (− 1 SD) 6.07 8.17 10.35 12.64 15.07 17.74 20.75
23.7 mm (average) 6.07 8.16 10.32 12.58 14.98 17.56 20.44
24.6 mm (+ 1 SD) 6.06 8.15 10.30 12.54 14.89 17.42 20.19
25.5 mm (+ 2 SD) 6.06 8.14 10.28 12.49 14.82 17.30 19.98
Maximum difference (− 2 SD to + 2 SD) 0.02 0.05 0.10 0.21 0.37 0.64 1.15
Plaque selection All same All same All same All same All same All same All same (enucleation)
  1. The implication is that the actual axial length need not be measured, and the population average axial length (23.7 mm) can be substituted
  2. mm, millimeters; SD, standard deviation