All adult patients with choroidal neovascularization (CNV) due to AMD or other causes in 1 eye and planned treatment with intraocular injections of either ranibizumab or bevacizumab, will be eligible. Patients will be excluded if they are younger than 18, are taking concurrent topical or systemic antibiotics, have active ocular infection, or have a history of use of topical antibiotics for any indication within the previous 3 months.