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Table 1 Mean values of CRT, PROS, FOSPET and FPR across visual acuity groups

From: Quantifying microstructural changes in retinitis pigmentosa using spectral domain – optical coherence tomography

Visual acuity subgroup Normal Mild visual impairment Moderate visual impairment P value
CRT (μm) 237 ± 49 216 ± 40 173 ± 101 0.008
PROS (μm) 52 ± 9 38 ± 10 34 ± 9 0.001
FOSPET (μm) 79 ± 11 63 ± 12 61 ± 10 0.001
FPR 1.53 ± 0.13 1.65 ± 0.19 1.90 ± 0.23 < 0.001
  1. CRT = central retinal thickness; PROS = photoreceptor outer segment; FOSPET = foveal outer segment pigment epithelial thickness; FPR = FOSPET:PROS ratio