Intravitreal Injection Download PDF, 630KB, PDF An intravitreal injection is an injection into the vitreous cavity of the eye. Not all medications will reach the retina when given as tablets of eye drops. Therefore, this method is used to treat retinal conditions as it delivers the medications closer to the retina. Your doctor may recommend intravitreal injections to treat certain retinal conditions where there are abnormal blood vessels that leak or bleed under or within the retina, causing damage to the retinal cells and photoreceptors. When the leakage and bleeding occurs at the macula (most sensitive part of the retina), patients can lose central vision. [Please download the PDF file if you are unable to view the image below.]