Absolute and relative thicknesses of the choroid by age.

<p>Mean values of subfoveal TC, as well as absolute and relative thicknesses of individual choroidal layers (CC and CV) measured with enface swept source optical coherence tomography (SS-OCT) and compared using the unpaired student t-test in the younger (<40 years) and older (≥40 years) age groups. Average values of the two eyes from each subject were used for this comparison. n represents the number of values compared. Intra-class correlation coefficient (ICC) for inter-observer agreements of the measured absolute thicknesses is also shown. Abbreviations: ICC: intra-class correlation coefficient; SD: standard deviation; TC: subfoveal total choroidal thickness; CC: choriocapillaris; CV: choroidal vessels; N/A: non-applicable; CI: confidence interval.