Pupillary stretching. A new procedure in vitreous surgery

Area of Science:

• Ophthalmology
• Surgical Techniques

Background:

• Vitreoretinal surgery often requires adequate pupillary dilation.
• Miotic and immobile pupils pose a surgical challenge, especially in complex cases like proliferative vitreoretinopathy and diabetic traction retinal detachment.

Purpose of the Study:

• To evaluate a new surgical technique for dilating miotic, immobile pupils during vitreoretinal procedures.
• To assess the efficacy and safety of iris loop sutures for pupillary expansion.

Main Methods:

• A novel technique involving four iris loop sutures was employed to create a large, square pupil.
• The procedure was performed on 26 aphakic eyes with proliferative vitreoretinopathy and diabetic traction retinal detachment.

Main Results:

• The technique successfully created a significantly dilated pupil in most cases.
• Nine eyes with intraoperative miosis experienced no functional iris damage.
• Fifteen eyes with pre-existing miotic pupils sustained minor sphincter tears but maintained partial dilation and responsiveness to medications.

Conclusions:

• Surgical dilatation using iris loop sutures is an effective method for managing miotic pupils in complex vitreoretinal surgery.
• While minor sphincter tears can occur in pre-existing rigid pupils, the technique generally preserves pupillary function.