Table 2.

Accuracy of Corneal Astigmatism Measurements Stratified by Previous Refractive Surgery and Type of Astigmatism

		Mean absolute difference			Mean difference vector
		OCT	Pentacam HR	IOLMaster 700	OCT	Pentacam HR	IOL Master700
Net astigmatism	LASIK/PRK (n = 44)	0.49 D	0.69 D*	0.61 D	0.20 D @ 6° ± 0.55 D	0.31 D @ 174° ± 0.75 D	0.30 D @ 164° ± 0.72 D
	RK (n = 16)	0.80 D	1.18 D*	1.28 D*	0.23 D @ 3° ± 0.91 D	0.32 D @ 87° ± 1.40 D	0.68 D @ 105° ± 1.44 D
	WTR (n = 17)	0.40 D	0.59 D	0.66 D	0.21 D @ 95° ± 0.46 D	0.06 D @ 142° ± 0.72 D	0.29 D @ 120° ± 0.90 D
	ATR (n = 27)	0.71 D	0.90 D	0.84 D	0.47 D @ 4° ± 0.69 D	0.14 D @ 175° ± 1.12 D	0.22 D @ 119° ± 1.13 D
	Plano (n = 13)	0.47 D	0.89 D	0.91 D	0.23 @ 176° ± 0.49 D	0.39 D @ 173° ± 1.00 D	0.42 D @ 162° ± 1.05 D
SimK astigmatism	LASIK/PRK (n = 44)	0.79 D	0.73 D	0.67 D	0.50 D @ 2° ± 0.73 D	0.52 D @ 175° ± 0.67 D	0.40 D @ 179° ± 0.68 D
	RK (n = 16)	1.14 D	1.03 D	1.15 D	0.15 D @ 164° ± 1.42 D	0.33 D @ 123° ± 1.29 D	0.44 D @ 96° ± 1.35 D
	WTR (n = 17)	0.60 D	0.62 D	0.60 D	0.17 D @ 165° ± 0.64 D	0.24 D @ 161° ± 0.70 D	0.12 D @ 153° ± 0.75 D
	ATR (n = 27)	1.00 Da	0.87 D	0.80 D	0.45 D @ 4° ± 1.14 D	0.43 D @ 165° ± 1.01 D	0.10 D @ 6° ± 1.04 D
	None (n = 13)	1.03 D	0.85 D	1.00 D	0.64 D @ 179° ± 0.95 D	0.59 D @ 173° ± 0.83 D	0.55 D @ 173° ± 1.03 D

The accuracy of corneal astigmatism measurements were measured by the vector difference with post-cataract surgery manifest refraction. LASIK = laser in situ keratomileusis; PRK = photorefractive keratectomy; RK = radial keratectomy; WTR = with-the-rule astigmatism; ATR = against-the-rule astigmatism; D = diopter.

^*P < .05 Comparison with OCT using generalized linear mixed-effect model.

^aP < .05 Comparison between eyes with WTR, ATR, or no refractive astigmatism using generalized linear mixed-effect model.