Purpose This is the first study reported in the United Kingdom to inve
stigate the efficacy and safety of posterior, sub-Tenon's triamcinolon
e acetonide injections in the treatment of posterior and intermediate
uveitis. Methods Twenty-eight posterior sub-Tenon's triamcinolone inje
ctions (40 mg) were given and the results analysed with a 6 month pros
pective follow-up in 13 cases. Results At 6 weeks follow-up, objective
improvement in visual acuity occurred in 25 eyes (p < 0.05). Vitreous
cellular activity was diminished in 21 eyes (p < 0.05). In most cases
improvement was observed within 2 weeks of injection. No patient requ
ired repeat triamcinolone injection within 3 months and all patients p
reviously treated with systemic immunosuppression were able to decreas
e or discontinue this treatment. Complications included transient elev
ation of intraocular pressure in 4 patients and persistent mild ptosis
in 2 patients. Conclusions We have demonstrated that posterior sub-Te
non's triamcinolone injection significantly decreases cystoid macular
oedema, with a corresponding increase in visual acuity, in patients wi
th posterior uveitis. Systemic immunosuppression may be reduced or dis
continued with the avoidance of associated systemic side effects, and
the technique has a high level of patient acceptability.