[Botulinum toxin injection-treatment of upper lid retraction in thyroid eye disease]

Upper lid retraction associated with thyroid eye disease may result in conjunctival and corneal exposure as well as in an esthetic problem. We evaluated the effect of botulinum toxin injections in order to lower the upper lid.

This prospective study included 19 eyes of 13 female patients presenting with scleral exposure aged 28-50 years. We injected 5-15 IE botulinum toxin A (Botox) transconjunctivally into the levator muscle. Lid position, negative side effects, and patient satisfaction were evaluated.

Lid retraction improved from 2.4 mm (+/-1.4 mm) prior to injection to 0.5 mm (+/-2.3 mm) 4 weeks after injection. In 11 of 19 eyes 4 weeks after injection and in 8 of 14 eyes 12 weeks after injection scleral exposure had resolved. Diplopia did not occur and tear production was not influenced. Two eyes had transient ptosis. Lid lag increased from 0.34 (+/-0.6 mm) to 0.84 mm (+/-0.9 mm). Of 13 patients, 8 were satisfied with the result.

Botulinum toxin A injection provides effective treatment especially in mild lid retraction and as a temporary solution for patients with unstable thyroid disease.