Reverse Pupillary Block - a Complication of Sutureless Scleral-fixated Intraocular Lenses

Area of Science:

• Ophthalmology
• Intraocular Lens Surgery
• Anterior Segment Imaging

Background:

• Reverse pupillary block (RPB) is characterized by posterior iris bowing, potentially caused by a lens-iris flap-valve mechanism.
• RPB can lead to iris chafing, pigment dispersion glaucoma, and uveitis-glaucoma-hyphema syndrome.
• Sutureless scleral-fixated intraocular lens (IOL) implantation is a common procedure for IOL luxation or aphakia.

Purpose of the Study:

• To investigate the incidence and management of reverse pupillary block (RPB) in patients undergoing sutureless scleral-fixated IOL implantation.
• To evaluate the effectiveness of YAG-laser iridotomy and surgical iridectomy in treating RPB.
• To identify risk factors and recommend prophylactic measures for RPB.

Main Methods:

• Retrospective analysis of 41 eyes that underwent sutureless scleral-fixated IOL implantation.
• Follow-up examinations included slit-lamp biomicroscopy, intraocular pressure measurement, and anterior segment OCT (Anterion).
• Assessment of RPB presence, associated complications, and treatment outcomes.

Main Results:

• Reverse pupillary block (RPB) was observed in eleven of the 41 eyes (26.8%).
• RPB was not consistently associated with elevated intraocular pressure but poses long-term risks.
• YAG-laser iridotomy was effective in treating RPB when iris visualization was adequate; surgical iridectomy was necessary for cases with anterior chamber hemorrhage.

Conclusions:

• Reverse pupillary block (RPB) is a notable complication following sutureless scleral-fixated IOL implantation.
• YAG-laser iridotomy is a viable treatment option for RPB, while surgical iridectomy may be required in specific scenarios.
• Prophylactic measures, such as intraoperative iridectomy or YAG-laser iridotomy, should be considered for patients with flaccid irises or those developing postoperative RPB.