Insights into atypical segmental layer thicknesses and phase retardation in thick corneas using ultrahigh-resolution polarization-sensitive optical coherence tomography

Table 3 Phase retardation (degrees) measurements conducted from the central cornea to the periphery in both healthy (n = 26) and keratoconus (KC) eyes (n = 19)

Zones	Healthy thick corneas	KC thick corneas	P value*
2 mm	24.92 [23.35, 30.29]	23.21 [22.57, 25.02]	0.0565
2 to 4 mm	30.19 [27.44, 33.45]	27.46 [25.86, 28.07]	0.0274
4 to 6 mm	39.03 [36.32, 41.51]	36.34 [34.58, 38.63]	0.0456
6 to 8 mm	46.02 [43.85, 47.13]	43.81 [41.21, 45.12]	0.0848
8 to 10 mm	50.84 [49.10, 52.72]	47.49 [44.64, 49.40]	0.0980

^*Mann–Whitney test
Median values are illustrated with 95% confidence intervals. Phase retardation maps cover a field size of 10 × 8 mm

ISSN: 2326-0254