Intraocular injections of Avastin, Lucentis or Eylea are common modern treatments for diabetic retinopathy and ARMD. In addition, other retinal vascular problems respond to these treatments, too, especially if retinal swelling (edema) is present. These so-called "anti-VEGF" injections are all very closely related and have very similar mechanisms of action (the way they work is very similar).
Retinal vascular occlusions, such as BRVO and CRVO, may also be treated with Ozurdex, a sustained release intra-ocular steroid, FDA approved for the treatment of diabetic retinopathy and uveitis as well.
Intraocular injections don't hurt. I prefer to numb your eye with several applications of a topical anesthetic before the injection. Because there is a risk of intraocular infection, pre-operative topical antibiotics are often recommended. We commonly use "Betadine" to help sterilize the eye prior to injection.
Treatments are given in the office. It is recommended you arrive with a driver to assist you, if needed.