Device for pupil extension during ocular surgery.
The use of pupil dilators should be considered in cataract surgery with small nondilating pupils, iris prolapse, and intraoperative floppy iris syndrome.
Use and Dosage
Different devices are currently available for intraoperative pupil dilation. Iris hooks are applied for four to five point iris retraction. Iris hooks are placed in sideports 1 mm posterior of the corneoscleral junction. Alternatively, ring expanders may be used for pupil expansion. Ring expanders reduce the risk of iris-sphincter damage due to a circumferential expansion of the pupil. Different devices are available and should be used according to the surgeon’s preference.
Excessive stretching of the pupil may result in iris sphincter damage. Improper positioning and removal of pupil dilators may result in tears of the anterior capsule or iridodialysis.