Distribution of central corneal thickness in the sample population stratified by age and gender, after weighting procedure.

CCTR: Mean central corneal thickness of all right eyes. CCTL: Mean central corneal thickness of all left eyes. CCTMean: Mean central corneal thickness between right and left eyes (only analysed when both measurements were available). CCTMin: The smaller central corneal thickness value between right and left eyes (only analysed when both measurements were available). CCT Δ: Difference in micrometer between CCT of the right versus left eye (only analysed when both measurements were available).