Medical grade silicone elastomer (Silastic 372) and silicone covered dacron ribbons were sutured under tendons of rectus muscles in 24 dogs to produce recessions of 5 to 15 mm while preserving the original point of insertion and arc of contact. Animals were observed one to nine months. A fibrous capsule always enveloped the implant and bound it to the sclera, so that the mechanical result was similar to a large recession. Microscopic cleavage planes between the fibrous capsule and episclera were disaffirmed by preceding gross examinations. Breakdown of conjunctiva and Tenon's capsule occurred in 11 dogs from two weeks to nine months after operation. Limbal incisions, prophylactic subconjunctival antibiotics, and type or thickness of silicone prosthesis had no effect on results. Episcleral silicone implants behave like silicone encircling tapes used in scleral buckling operations.
Beisner DH. Extraocular Muscle Recessions Utilizing Silicone Tendon Prostheses. Arch Ophthalmol. 1970;83(2):195-204. doi:10.1001/archopht.1970.00990030197013