A 5-year-old boy who was diagnosed with congenital fibrosis of the extraocular muscles (CFEOM) presented with bilateral lower eyelid retraction after strabismus surgery. To correct the lower eyelid retraction, a silicone sponge was used as a spacer; it was sutured to the inferior border of the tarsus and the lower eyelid retractor. At the 3-month postoperative visit, both lower eyelid margins were at the inferior corneal limbus. No complications or recurrence was noted at 1 year after surgery. The silicone sponge served as a good spacer for correction of lower lid retraction after strabismus surgery in a child with CFEOM.