Strabismus After Ahmed Glaucoma Valve Implantation

Area of Science:

• Ophthalmology
• Glaucoma Surgery
• Strabismus Research

Background:

• Glaucoma drainage device (GDD) implantation is a common surgical procedure for managing refractory glaucoma.
• Postoperative strabismus is a known complication of GDDs, but data on smaller devices like the Ahmed glaucoma valve (AGV) is limited.
• Understanding the incidence and characteristics of strabismus after AGV implantation is crucial for patient counseling and management.

Purpose of the Study:

• To investigate the incidence and characteristics of new-onset strabismus following Ahmed glaucoma valve (AGV) implantation.
• To compare strabismus patterns after AGV implantation with those reported for other GDDs.
• To analyze the relationship between AGV location and the type of strabismus developed.

Main Methods:

• Retrospective review of 732 patients who underwent initial AGV implantation between 2013 and 2018.
• Analysis of the rate and characteristics of postoperative strabismus, including diplopia, type of deviation, and AGV location.
• Evaluation of patient demographics (age, gender) and treatment modalities for strabismus.

Main Results:

• A 4% incidence of new-onset strabismus was observed in 29 out of 732 patients post-AGV implantation.
• Exotropia was the most frequent type of strabismus (11 patients), followed by combined horizontal/vertical deviations (9 patients).
• Superotemporal AGV placement was more commonly associated with ipsilateral hypertropia compared to superonasal placement.

Conclusions:

• The incidence of strabismus after AGV implantation is comparable to that of larger GDDs.
• Exotropia is the predominant form of strabismus following AGV implantation.
• Ophthalmologists should discuss the risk of strabismus with patients prior to AGV surgery.