Snapshot A 33-year-old man presents to the emergency department with new-onset vision blurriness with "flashing lights." His symptoms began approximately 4 days prior to presentation and have progressively worsened. He occasionally sees floaters, and his symptoms affect both eyes but are more severe on the left eye. He has a past medical history of HIV infection and reports to not taking his medication for the past year. Ophthalmology was consulted and performed a dilated ocular exam. Indirect ophthalmoscopy demonstrated 1-2 yellow-white foci of disease in a perivascular distribution accompanied by retinal hemorrhage in a "brush fire" pattern. His CD4+ count is 39/uL. She is started on cidofovir and antiretroviral therapy. (Cytomegalovirus retinitis) Introduction Mechanism of action login to view 3 more bullets Mechanism of resistance login to view 1 more bullet Clinical use login to view 3 more bullets Adverse effects login to view 8 more bullets