Strabismus surgery in ocular myasthenia gravis

Area of Science:

• Ophthalmology
• Neurology
• Surgical Science

Background:

• Ocular myasthenia gravis (OMG) frequently causes troublesome diplopia, impacting patients' quality of life.
• Surgical intervention for OMG-induced strabismus is considered when non-surgical management fails.
• Preoperative assessment requires stable deviation for at least six months.

Observation:

• This study involved four patients diagnosed with ocular myasthenia gravis experiencing significant diplopia.
• All patients were in clinical remission with a stable angle of deviation prior to surgery.
• Surgical procedures included conventional recession/resection and hang-loose recession with adjustable sutures.

Findings:

• Three out of four patients achieved single binocular vision in the primary position post-surgery.
• No prism correction or compensatory head posture was required for these patients.
• Electron microscopy of surgical specimens revealed non-specific muscle fiber degeneration and sarcomeric disorganization.

Implications:

• Eye muscle surgery presents a viable treatment option for achieving binocular single vision in select OMG patients.
• The observed muscle abnormalities suggest underlying neuromuscular pathology affecting extraocular muscles.
• Further research into the specific mechanisms of muscle degeneration in OMG is warranted.