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Table 3 Surgically induced astigmatism (SIA) determined using different keratometric measurement approaches. Arithmetic SIAs were calculated by the vector method

From: Comparison of surgically induced astigmatism between anterior and total cornea in 2.2 mm steep meridian incision cataract surgery

 

Arithmetic SIA

∆J0

∆J45

Flattening (diopter)

Torque

(dioter)

Mean diopter

± SD

Range

(diopter)

Median

(diopter)

* p value

** p value

Mean diopter

± SD

* p value

** p value

Mean diopter

± SD

* p value

** p value

Automated K

0.41 ± 0.27

0–1.44

0.35

 

0.09

0.04 ± 0.20

 

0.08

−0.02 ± 0.14

 

0.50

0.23 ± 0.31

−0.01 ± 0.29

Scheimpflug Anterior K

0.46 ± 0.30

0–1.63

0.43

0.09

 

0.08 ± 0.20

0.08

 

0.00 ± 0.17

0.50

 

0.34 ± 0.32

0.05 ± 0.30

Scheimpflug Posterior K

0.13 ± 0.07

0–0.29

0.11

<  0.001

<  0.001

0.01 ± 0.06

0.17

0.02

−0.01 ± 0.05

0.94

0.64

0.01 ± 0.11

−0.01 ± 0.10

Scheimpflug EKR 3.0-mm

0.62 ± 0.35

0.10–2.18

0.60

<  0.001

<  0.001

0.08 ± 0.27

0.33

0.99

−0.01 ± 0.23

0.92

0.49

0.34 ± 0.49

0.03 ± 0.39

Scheimpflug EKR 4.5-mm

0.52 ± 0.28

0.02–1.16

0.51

0.010

0.021

0.07 ± 0.22

0.42

0.28

−0.01 ± 0.19

0.79

0.52

0.32 ± 0.38

−0.02 ± 0.33

Scheimpflug TCRP 2.0-mm ring

0.68 ± 0.46

0–2.64

0.61

<  0.001

<  0.001

0.12 ± 0.32

0.06

0.11

−0.01 ± 0.24

0.96

0.46

0.40 ± 0.53

0.07 ± 0.48

Scheimpflug TCRP 3.0-mm zone

0.61 ± 0.37

0.06–2.08

0.55

<  0.001

<  0.001

0.11 ± 0.27

0.07

0.17

−0.01 ± 0.21

0.98

0.38

0.32 ± 0.50

0.06 ± 0.39

Scheimpflug TCRP 4.0-mm zone

0.50 ± 0.30

0.01–1.39

0.46

0.017

0.07

0.09 ± 0.22

0.15

0.96

0.00 ± 0.17

0.61

0.79

0.32 ± 0.40

0.03 ± 0.28

  1. SD standard deviation
  2. * p-value for comparison with Automated K
  3. ** p-value for comparison with Scheimpflug Anterior K