. Author manuscript; available in PMC: 2017 Nov 1.

Published in final edited form as: Optom Vis Sci. 2016 Nov;93(11):1356–1363. doi: 10.1097/OPX.0000000000000987

Table 2.

Comparison of repeatability values with previous studies of simulated keratometry.

Keratometry Value	No of eyes	Study	Instrument	COR	COV	ICC
Steep K (D)	264	current study	Zeiss Atlas	0.36	0.30	0.99
	79	Huang et al (2015)^*	OphthaTop	0.29	0.24	0.99
	35	Wang et al (2012)^*	EyeSys Vista	0.35	0.29	0.99
			Medmont	0.22	0.17	0.99
			Topolyzer	0.34	0.28	0.99
	77	Mao (2013)^*	Keratograph	0.30	0.24	0.99
	57	Kobashi (2012)	Zeiss Atlas			0.98

Flat K orientation (Degrees)	140	current study	Zeiss Atlas	8.75	4.71	0.99
Flat K orientation (Degrees)	57	Kobashi (2012)	Zeiss Atlas			0.98

Astigmatism(D)	264	current study	Zeiss Atlas	0.29	10.53	0.97
Astigmatism(D)	57	Kobashi (2012)	Zeiss Atlas			0.96

J₀ (D)	264	current study	Zeiss Atlas	0.15		0.98
	79	Huang et al (2015)^*	OphthaTop	0.16		0.97
	77	Mao (2013)^*	Keratograph	0.09		0.99
	57	Kobashi (2012)	Zeiss Atlas			0.92
	101	Read (2009)	Medmont	0.12		0.99

J₄₅ (D)	264	current study	Zeiss Atlas	0.17		0.90
	79	Huang et al (2015)^*	OphthaTop	0.12		0.92
	77	Mao (2013)^*	Keratograph	0.08		0.98
	57	Kobashi (2012)	Zeiss Atlas			0.91
	101	Read (2009)	Medmont	0.12		0.95

= values are average of 2 observers;

COR= coefficient of repeatability; COV = coefficient of variation and ICC = Intraclass correlation coefficient