Table 5 The prediction error of IOL power calculation formulas based on different values of corneal power.

From: An innovative approach for determining the customized refractive index of ectatic corneas in cataractous patients

Subject

Formula

Corneal power using S.KI

Corneal power using I.KI

Corneal calculated power based on our proposed method

0.5 mm

1.0 mm

2.0 mm

3.0 mm

4.0 mm

N.C.I

I.C.I

N.C.I

I.C.I

N.C.I

I.C.I

N.C.I

I.C.I

N.C.I

I.C.I

S1-OD

SRK/T

2.58

1.96

1.68

1.54

1.73

1.58

1.89

1.76

2.07

1.95

2.27

2.16

Holladay2

2.91

2.18

1.78

1.63

1.84

1.69

2.05

1.90

2.26

2.12

2.48

2.35

HofferQ

2.48

1.71

1.35

1.18

1.41

1.24

1.62

1.46

1.84

1.69

2.09

1.95

Haigis

2.42

1.58

1.20

1.02

1.27

1.08

1.49

1.31

1.73

1.57

2.00

1.84

Barrett

2.93

2.20

1.81

1.66

1.87

1.72

2.07

1.93

2.28

2.15

2.50

2.37

Barrett toric

 − 0.03

 − 0.57

 − 0.49

 − 0.64

 − 0.49

 − 0.63

 − 0.39

 − 0.53

 − 0.25

 − 0.35

0.0

 − 0.12

S2-OD

SRK/T

6.16

3.49

6.40

5.51

6.09

5.23

5.09

4.28

3.63

2.91

2.08

1.48

Holladay2

6.29

3.48

6.52

5.60

6.18

5.29

5.13

4.29

3.61

2.85

1.98

1.34

HofferQ

6.89

3.85

7.16

6.14

6.80

5.83

5.66

4.75

4.02

3.21

2.28

1.60

Haigis

4.57

1.88

4.81

3.92

4.50

3.64

3.49

2.68

2.03

1.30

0.47

 − 0.14

Barrett

4.1

1.3

4.32

3.41

3.99

3.10

2.94

2.11

1.43

0.68

 − 0.19

 − 0.81

S2-OS

SRK/T

5.96

3.51

5.88

6.45

5.84

6.42

5.18

5.76

4.18

4.72

3.04

3.55

Holladay2

6.17

3.57

6.03

6.63

5.99

6.60

5.31

5.91

4.25

4.81

3.05

3.58

HofferQ

6.81

3.98

6.71

7.38

6.67

7.34

5.91

6.57

4.75

5.37

3.44

4.03

Haigis

4.30

1.82

4.21

4.79

4.17

4.76

3.51

4.09

2.50

3.05

1.35

1.86

Barrett

3.92

1.33

3.78

4.38

3.74

4.34

3.06

3.66

2.01

2.57

0.81

1.34

S3-OS

SRK/T

5.30

2.95

4.62

4.27

4.43

4.07

3.50

3.17

2.31

2.04

1.19

0.95

Holladay2

5.68

3.29

4.97

4.60

4.77

4.40

3.81

3.47

2.58

6.71

1.41

1.17

HofferQ

5.64

3.24

4.95

4.59

4.75

4.38

3.80

3.47

2.59

2.31

1.45

1.20

Haigis

4.59

2.28

3.92

3.58

3.73

3.38

2.83

2.50

1.66

2.51

0.56

0.33

Barrett

NC

1.68

NC

NC

NC

NC

NC

1.88

1.02

0.75

 − 0.09

 − 0.33

S4-OS

SRK/T

3.29

0.54

 − 0.42

 − 1.61

 − 0.13

 − 1.35

 − 0.01

 − 1.15

 − 0.40

 − 1.23

 − 0.69

 − 1.24

Holladay2

4.35

1.65

0.71

 − 1.07

0.99

 − 0.74

1.11

 − 0.45

0.76

 − 0.57

0.49

 − 0.57

HofferQ

4.47

1.84

0.92

 − 0.91

1.21

 − 0.57

1.32

 − 0.29

0.95

 − 0.41

0.67

 − 0.41

Haigis

4.22

1.54

0.61

 − 1.24

0.90

 − 0.90

1.01

 − 0.61

0.64

 − 0.74

0.35

 − 0.74

Barrett

4.04

1.43

0.48

 − 1.30

0.77

 − 0.97

0.89

 − 0.68

0.54

 − 0.80

0.26

 − 0.80

S5-OD

SRK/T

 − 0.31

 − 1.17

 − 0.32

 − 0.32

 − 0.36

 − 0.31

 − 0.53

 − 0.43

 − 0.72

 − 0.62

 − 0.95

 − 0.87

Holladay2

1.45

 − 0.49

1.01

1.17

0.86

1.01

0.50

0.64

0.17

0.29

 − 0.19

 − 0.11

HofferQ

1.63

 − 0.33

1.15

1.34

1.01

1.20

0.65

0.83

0.33

0.48

 − 0.03

0.09

Haigis

0.43

 − 0.62

0.93

1.13

0.78

0.98

0.41

0.60

0.07

0.24

 − 0.30

 − 0.18

Barrett

1.29

 − 0.64

0.87

1.07

0.72

0.91

0.36

0.54

0.03

0.19

 − 0.33

 − 0.22

S5-OS

SRK/T

5.87

3.04

5.63

6.05

5.36

5.74

4.30

4.66

2.87

3.19

1.36

1.61

Holladay2

6.52

3.71

6.21

6.64

5.94

6.35

4.90

5.27

3.48

3.82

1.98

2.24

HofferQ

6.47

3.74

6.25

6.64

5.98

6.35

4.96

5.30

3.58

3.89

2.11

3.65

Haigis

5.92

3.16

5.69

6.09

5.42

5.80

4.39

4.74

3.00

3.31

1.53

1.77

Barrett

4.80

2.15

4.52

4.90

4.26

4.62

3.28

3.61

1.94

2.24

0.53

0.75

  1. Bold numbers indicate the lowest PE value for all eyes for the most appropriate corneal power and IOL calculation formula.
  2. S.KI: standard keratometry index (1.3375); I.KI: individual corneal keratometry index; N.C.I: normal corneal index (1.376); I.C.I: individual corneal index; NC: not calculable. The Barrett formula for our third patient’s left eye was not applicable since his calculated values of corneal power were more than 60 diopters.
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