Self-retaining iris speculum for open-sky vitrectomy.

We have designed a self-retaining iris speculum for use in open-sky vitrectomy. This speculum retracts the iris away from the central field and thus allows the surgeon better visibility and less reliance on an assistant's help for retraction. The possibility of iris laceration and dialysis with excessive bleeding, as sometimes seen with other forms of iris retraction, can be prevented.