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Table 3 Arithmetic and absolute IOL PEs (implanted IOL power - predicted IOL power), and variances of mean arithmetic IOL PE

From: Comparative clinical accuracy analysis of the newly developed ZZ IOL and four existing IOL formulas for post-corneal refractive surgery eyes

Formula

N

Arithmetic IOL PE (D)

Absolute IOL PE (D)

Variances (D2)

  

Mean ± SD

Median (Quartile )

Mean ± SD

Median (Quartile)

Median (Quartile)

ZZ IOL

38

-0.00 ± 0.47

-0.02 (-0.33 to 0.35)

0.38 ± 0.26

0.33 (0.18 to 0.57)

0.11 (0.03 to 0.33)

Shammas

33a

-0.40 ± 1.84

-0.69 (-1.23 to -0.31)

1.18 ± 1.46

0.77 (0.42 to 1.34)b

0.60 (0.18 to 1.81)b

Haigis-L

33a

0.21 ± 2.07

-0.08 (-0.52 to 0.48)

1.09 ± 1.76

0.46 (0.29 to 0.93)b

0.22 (0.08 to 0.87)b

Barrett True K (no history)

38

0.19 ± 1.98

-0.16 (-0.59 to 0.30)

1.04 ± 1.68

0.52 (0.28 to 0.80)b

0.27 (0.08 to 0.65)b

Ray tracing

38

0.65 ± 1.97

0.20 (-0.24 to 1.11)b

1.10 ± 1.76

0.71 (0.20 to 1.25)b

0.51(0.04 to 1.57)b

  1. IOL intraocular lens, D diopters
  2. aNo IOL calculation results obtained with Shammas and Haigis-L formula in one eye since post-radial keratotomy was not available
  3. bSignificantly different versus ZZ IOL (P < 0.05, with Bonferroni correction)