This study involved the irradiation of mouse embryos at different stages of pregnancy, using dose of ٤ Gy γ-radiation, at ١٠, ١٢, ١٤ and ١٦ days of pregnancy. Pregnant mice were killed after ٢, ٤ and ٦ days post irradiation. Embryo’s heads were isolated and serial cross sections were made to investigate the effect of irradiation on the different components of the eye at different periods of eye organogenesis. It was proved from this study that irradiation causes microphtalmia and decrease in the growth of lens, retina and corneal stroma, as well severe disruption in its development and disfigurement in its hitogenesis. These defects have shown great differences in their severity according to the age of embryos at exposure and the number of days post irradiation.