Comparison of Color Light-Emitting Diode Corneal Topographer and Dual Rotating Scheimpflug–Placido Topographer

Table 3

Comparison of corneal index measurements using dual rotating Scheimpflug–Placido and color light-emitting diode corneal topographers.

Parameter	DRSP (mean ± SD)	Color LED (mean ± SD)	Difference		value	ICC
			Mean ± SD	95% CI
Postrefractive group
Anterior corneal indices (D)
simK	38.78 ± 1.80	38.71 ± 1.88	−0.08 ± 0.44	−0.19, 0.04	0.186	0.986
Astigmatism magnitude	0.83 ± 0.47	0.84 ± 0.53	0.01 ± 0.37	−0.09, 0.10	0.904	0.938
J0	−0.32 ± 0.28	−0.29 ± 0.32	0.03 ± 0.20	−0.02, 0.08	0.267	0.925
J45	0.06 ± 0.22	−0.04 ± 0.25	−0.10 ± 0.15	−0.14, −0.06	0.000	0.905
Posterior corneal indices (D)
simK	−6.39 ± 0.16	−5.97 ± 0.32	0.42 ± 0.32	0.34, 0.51	0.000	0.327
Astigmatism magnitude	−0.36 ± 0.11	−0.39 ± 0.21	−0.04 ± 0.23	−0.09, 0.02	0.216	0.183
J0	0.17 ± 0.06	0.08 ± 0.16	−0.09 ± 0.16	−0.13, −0.05	0.000	0.016
J45	−0.02 ± 0.15	−0.01 ± 0.06	−0.01 ± 0.16	−0.05, 0.03	0.655	0.000
Normal group
Anterior corneal indices (D)
simK	43.28 ± 1.37	43.40 ± 1.38	0.12 ± 0.26	0.06, 0.19	0.001	0.991
Astigmatism magnitude	1.34 ± 0.83	1.41 ± 0.88	0.07 ± 0.35	−0.02, 0.15	0.133	0.956
J0	−0.61 ± 0.44	−0.64 ± 0.47	−0.03 ± 0.17	−0.08, 0.01	0.135	0.963
J45	0.01 ± 0.25	0.00 ± 0.24	−0.01 ± 0.14	−0.04, 0.03	0.740	0.916
Posterior corneal indices (D)
simK	−6.43 ± 0.27	−6.26 ± 0.25	0.16 ± 0.12	0.13, 0.19	0.000	0.944
Astigmatism magnitude	−0.37 ± 0.11	−0.41 ± 0.17	−0.04 ± 0.16	−0.08, −0.00	0.043	0.499
J0	0.17 ± 0.07	0.18 ± 0.09	0.01 ± 0.09	−0.01, 0.04	0.274	0.469
J45	0.00 ± 0.06	0.00 ± 0.09	−0.00 ± 0.10	−0.03, 0.03	0.977	0.175

CI, confidence interval; color LED, color light-emitting diode corneal topographer; DRSP, dual rotating Scheimpflug–Placido corneal topographer; ICC, intraclass correlation coefficient; K, keratometry. Paired sample t-test.