Does Laser Iridotomy Cause Secondary Epiretinal Membrane?

Area of Science:

• Ophthalmology
• Glaucoma Research
• Retinal Imaging

Background:

• Epiretinal membrane (ERM) is a common condition affecting vision.
• Neodymium-doped yttrium aluminum garnet laser iridotomy (LI) is a procedure used for primary angle-closure glaucoma.
• The long-term effects of LI on ERM development are not well understood.

Purpose of the Study:

• To determine the long-term frequency of epiretinal membrane (ERM) after neodymium-doped yttrium aluminum garnet laser iridotomy (LI).
• To compare ERM development between eyes that underwent LI and a control group.
• To assess the influence of subsequent cataract surgery on ERM formation post-LI.

Main Methods:

• Retrospective study of 94 eyes undergoing LI for primary angle-closure glaucoma, followed for at least 4 years.
• Control group of 66 eyes with suspected glaucoma and no prior ERM.
• Spectral domain optical coherence tomography (SD-OCT) used for ERM assessment.
• Comparison of ERM frequencies between groups and based on cataract surgery status.

Main Results:

• ERM developed in 38.2% of eyes after LI versus 19.6% in the control group (p=0.012).
• Stage 1 ERM was more common, but Stage 2 ERM also occurred.
• ERM incidence was similar in eyes with and without subsequent cataract surgery (43.7% vs 35.4%, p=0.435).
• Significantly more ERM in phakic eyes after LI compared to controls (p=0.045).

Conclusions:

• Neodymium-doped yttrium aluminum garnet laser iridotomy (LI) appears to be a predisposing factor for ERM development.
• This association holds true regardless of whether cataract surgery is performed subsequently.
• Further research may be warranted to elucidate the mechanisms involved.