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Table 1 Optimized constants of used IOLs in each formula

From: Accuracy of refractive outcomes using standard or total keratometry for intraocular lens power formulas in conventional cataract surgery

 

AcrySof SN60WF

CT ASPHINA 509

Softec 1

N

185

129

133

IOL power

   

median (range)

20.5 (7.5 to 27)

17 (0 to 29.5)

17.75 (-4 to 25.5)

Optimized constants

   

Barrett universal II

+ 1.88

+ 1.27

+ 1.59

Haigis a0

-0.769

-0.626

+ 0.932

a1

+ 0.234

+ 0.212

+ 0.400

a2

+ 0.217

+ 0.181

+ 0.100

SRK/T

119.0

117.84

118.43

Holladay 2

+ 5.601

+ 4.838

+ 5.219