Purpose : to determine the incidence of eyes that have an increase in the intraocular pressure( I.O.P ) after subtenon injection of triamcinolone acetonide . Methods: 40 patient 50 eyes treated with 40 mg subtenon injection of TA for different diseases. The incidence of an I.O.P elevation ≥ 5mmhg was determine, the peak of I.O.P, the relation between I.O.P elevation and the age, gender, the kind of disease and the number of we injections of ta Results : an elevation I.O.P≥ 5mmhg was found in 25 eyes ( 50%) . The I.O.P began to increase significantly from 1 month (20%) The peak of I.O.P after 3 months (80%) and returned to the baseline I.O.P in 10 months . the elevation I.O.P≥ 5 mmhg was significantly related with younger age (80%) between 40-50 years the elevation I.O.P is between females' more in cedence than males (59,59%) females and (42,8%) males, and is less incidence aftere single injection (42.8%) less than multi injection (60%) multiple No significant relation is round between the disease and the incidence of increased I.O.P . Conclusion : repeated injections of TA and injection of younger patients especially women increase the incidence of an I.O.P elevation .