In 1980-1988 at the Second Ophthalmological Clinic 78 enucleations of the bulbs with a orbital silicon implant were performed. The tolerance of the implant and the cosmetic result of the operation was evaluated in 53 adults and 5 children. The observation period varied between 6 months and 7 years. From the total number of 53 adults a very good cosmetic effect was achieved in 9 (17.1%), a good effect in 25 (47.1%), a satisfactory effect in 12 (22.6%) a poor effect in 2 (1.8%) patients. The implant was rejected in 5 (9.4%) of the cases, 4 implants within one month and one two years after enucleation. A very good cosmetic effect was observed in one (20%) child and a good effect also in one (20%). The implant was rejected in 3 (60%) children, 1, 4 and 20 months after operation. Rejection after 20 months was preceded by an inflammatory reaction in the area of the implant. Rejection of orbital silicon implants in adults was as a rule due to surgical complications or incorrect surgical technique. In the rejection of implants in young children the increased biological reaction of the child organism may be involved.