A major disadvantage of nylon sutures is the need to remove them post-
operatively to prevent suture fracture and irritation. Mersilene (poly
ester) sutures do not hydrolyse or disintegrate and are in theory supe
rior to nylon. Fifty-two consecutive patients were examined an average
of 3 years after uncomplicated extracapsular cataract extraction with
corneal sections sutured with interrupted 11/0 polyester. It was foun
d that 29% had suture-related problems and required, or had previously
undergone, suture removal for reasons other than high astigmatism. Th
e most common problem was a loose stitch with adherent mucus and corne
al vascularisation (17% of patients at review). Sixty-six per cent of
patients with loose sutures reported discomfort, We would not advocate
prophylactic removal, but patients with polyester sutures should be a
dvised to return if they become symptomatic.