Table 5.

Mean and standard deviation (SD) of paired differences and 95% limits of agreement (LOA) of curvature reading in 5 corneal rings with Pentacam and Orbscan.

Corneal rings	Grade 1		Grade 2		Grade 3
	Mean ± SD	95% LOA	Mean ± SD	95% LOA	Mean ± SD	95% LOA
1 mm ring	−0.36 ± 0.51	−1.35 to 0.64	−2.41 ± 1.37	−5.09 to 0.27	−7.46 ± 3.35	−14.03 to −0.88
2 mm ring	−0.26 ± 0.42	−1.09 to 0.56	−2.05 ± 1.03	−4.06 to −0.03	−6.6 ± 3.52	−13.5 to 0.3
3 mm ring	−0.17 ± 0.41	−0.97 to 0.63	−1.53 ± 0.75	−2.99 to −0.06	−5.51 ± 3.02	−11.42 to 0.41
4 mm ring	−0.09 ± 0.28	−0.64 to 0.46	−0.97 ± 0.5	−1.94 to 0.00	−3.97 ± 2.38	−8.64 to 0.7
5 mm ring	0.17 ± 1.59	−2.95 to 3.28	−0.43 ± 0.64	−1.70 to 0.83	−2 ± 1.62	−5.16 to 1.17

LOA: Limits of agreement; SD: Standard deviation.