Age and gender specific prevalence of trichiasis and trichiasis vision status.

TT, trachomatous trichiasis.
*TT prevalence smoothed by fitting logistic regression curve to estimated TT prevalence.
**Vision status: Normal vision = presenting visual acuity of ≥6/18 in the better eye; Low vision = presenting visual acuity of <6/18 to ≥3/60 in the better eye; Blindness = presenting visual acuity of <3/60 in the better eye. Prevalence of vision status = smoothed TT prevalence×predicted probability of vision status derived from reference 14.