Cytomegalovirus infection in the eye usually affects the function of the retina, resulting in vision loss and visual field defects. Cytomegalovirus infection will affect the retina, forming inflammatory lesions or even necrotic lesions on the retina, leading to retinal edema, hemorrhage and even retinal detachment. Patients will have symptoms such as vision loss and visual field defects, and need to go to the ophthalmology department of the hospital for fundoscopy and fundus ultrasound to confirm the diagnosis. For treatment, antiviral drugs and hormonal drugs are used to reduce inflammation, such as ganciclovir and methylprednisolone, etc. If retinal detachment occurs, surgical treatment is usually needed. Patients should consult the ophthalmology department of the hospital in time, and the doctor will diagnose the specific cause through detailed examination, and then take targeted treatment to eliminate the symptoms.