Understanding the Correlation between Tomographic and Biomechanical Severity of Keratoconic Corneas

Table 1

Median ± 95% CI of the variables evaluated in normal corneas and diseases grades.

	Normal		KC
	Grade 0		Grade 1		Grade 2		Grade 3
	Median	95% CI	Median	95% CI	Median	95% CI	Median	95% CI
1 (D)	42.7	42.4–43.2	44	43.3–44.5	47.7	47.2–49.0	54	52.2–58.0
2 (D)	43.7	43.2–44.2	46.8	45.8–47.8	53.4	52.4–53.8	60.9	57.5–65.5
max (D)	44.2	43.6–44.6	50.6	48.9–52.5	59.2	58.4–60.6	69.6	65.4–75.2
mean (D)	43.3	42.7–43.6	45.8	44.5–46.1	50.4	50.0–51.3	56.9	54.9–61.3
Location of cone (mm)	—	—	0.28	0.12–1.53	0.25	0.16–1.48	0.25	0.12–1.15
CCT (micron)	526.5	521.0–536.9	488	466.6–505.0	454	446.7–464.7	421	391.4–440.3
TPT (micron)	522	517.0–528.9	475	459.3–494.7	443	435.5–448.1	403	376.0–432.6
IOP (mmHg)	16.3	15.5–17.0	14	13.5–14.7	13.5	12.0–14.0	12.5	11.2–13.0
1 (msec)	7.48	7.41–7.55	7.15	7.08–7.26	7.06	6.88–7.15	6.92	6.74–7.03
Time (msec)	15.02	14.78–15.25	14.78	14.78–15.10	15.02	14.73–15.53	15.02	14.78–15.40
2 (msec)	21.41	21.26–21.57	21.56	21.42–21.74	21.63	21.51–21.81	21.85	21.73–22.05
DA (mm)	1.10	1.06–1.13	1.22	1.15–1.26	1.23	1.21–1.30	1.39	1.34–1.47
AUDA (mmHg·msec)	13.01	12.09–13.84	18.5	15.72–19.41	18.42	16.70–20.99	23.84	21.13–28.64
an RMS (mm)	0.095	0.091–0.099	0.111	0.107–0.118	0.113	0.109–0.124	0.132	0.125–0.142
bn RMS (mm)	0.034	0.033–0.037	0.026	0.023–0.029	0.028	0.023–0.032	0.030	0.025–0.039