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Myasthenia gravis (MG) causes diplopia in about 90% of patients with the disease.1–3 Regardless of systemic treatments, complete remission occurs in only about 37%; and, even with prism glasses, an acceptable field of binocular single vision (BSV) is not always achieved.1–3,5 Minimal literature has emerged describing success with strabismus surgery in patients with diplopia caused by MG despite systemic treatments.6–10 In all cases found published to date, surgery had been performed only after the strabismus angle concerned had been stable for at least five months. We describe two patients where strabismus surgery was used to manage unstable diplopia caused by MG with longstanding success.
Case 1
A 36 year old woman presented in 1992 with fatigable …