[Studies on the stabilization of the cornea in rabbits]. / Untersuchungen zur Verfestigung der Hornhaut am Kaninchen.

BACKGROUND: The mechanical stabilization of the cornea in keratoconus may delay progression of this disease. The cross-linking techniques optimized in corneas of enucleated porcine eyes were investigated under in vivo conditions in rabbits to estimate the biocompatibility and duration of the stiffening effect. METHODS: Twenty-eight rabbits were treated monocularly, the fellow eye serving as control. The epithelium was mechanically removed and 19 eyes were treated with riboflavin plus ultraviolet irradiation (365 nm, 2 mW/cm2) for 45 min and 9 eyes with 0.075% glutaraldehyde for 20 min. After treatment, the eyelids were sutured for 3 days. The healing process was controlled by slit-lamp examination and photographically documented. After 1 month, 20 animals and after 3 months 8 animals were sacrificed, the eyes enucleated, and the stress-strain relation of the corneas measured and compared to the fellow eye. RESULTS: The epithelium was closed after 4-5 days. The transparency of the corneas remained clear during follow-up, and there were no signs of inflammatory reaction. Stress for a strain of 6% was higher in the treated corneas by a factor of 1.3 +/- 0.66 (P = 0.319) in the glutaraldehyde group and by a factor of 1.6 +/- 0.75 (P = 0.0408) in the riboflavin group at 1 month, and by 1.3 +/- 0.48 (P = 0.07) at 3 months after treatment. CONCLUSIONS: The cross-linking technique using riboflavin plus UV irradiation is suitable for at least temporarily stiffening the cornea in vivo and seems to be a promising method for conservative treatment of keratectasia.

[Sympathetic ophthalmia 50 years after penetrating injury. A case report]. / Sympathische Ophthalmie 50 Jahre nach perforierender Verletzung. Eine Kasuistik.

BACKGROUND: Sympathetic ophthalmia is a rare form of autoimmune uveitis and manifests in 90% of cases within the first year after penetrating injuries or surgical interventions. PATIENTS AND METHODS: In the present case the sympathetic ophthalmia started 50 years after a penetrating injury by a shell splinter. The injured eye was amaurotic and phthitic and the sympathizing eye showed an anterior uveitis. After an initial treatment with local and systemic corticosteroids the uveitis improved. The clinical diagnosis of sympathetic ophthalmia was made after a second inflammation course with substantial visual loss and subtotal chorioidal detachment. After enucleation of the exciting eye the diagnosis was confirmed by histological examination. An immunosuppressive therapy including azathioprine and cyclosporine became necessary to control the uveitis. RESULTS: After enucleation the corticosteroid treatment was not sufficient. Additional therapy with azathioprine resulted in a recovery of the symptoms but had to be stopped because of adverse reactions. The alternative therapy by means of cyclosporine was tolerated well, but dose reduction was difficult because of recurrences. After a 30 month lasting cyclosporine therapy the patient shows stabile results since 6 months with visual acuity of 20/30. CONCLUSIONS: The present case report demonstrates that a delayed onset of sympathetic ophthalmia 50 years after initial trauma may occur but can be controlled by an immediate, high dose immunotherapy.