[Significance of the horizontal lid split in the surgical therapy for involutional entropion]

The horizontal blepharotomy or Wies procedure is a simple and quick surgical procedure for the correction of an involutional entropion. The procedure is directed against two of the at least three most important pathogenetic factors (horizontal lid loosening and overriding the preseptal orbicularis muscle). This article gives an overview of the literature and significance of this procedure gained in the 50 years since its first description.