A 50-year-old male with HIV presents with bilateral loss of vision. Examination reveals retinal lesions. What is the likely diagnosis and treatment?
This patient's symptoms and findings suggest cytomegalovirus (CMV) retinitis, an opportunistic infection that can occur in individuals with HIV, especially when the CD4 count is below 50 cells/mm^3. The standard treatment includes antiviral drugs such as ganciclovir or foscarnet.