Central Retinal Artery Occlusion (CRAO): Given the patient's age and history of hypertension, hyperlipidemia, and diabetes, CRAO is a likely cause of sudden vision loss. The use of Ozempic (semaglutide) may also increase the risk of thromboembolic events.

Retinal Detachment: This condition can cause sudden vision loss, especially in patients with diabetes. The patient's history of diabetes and age increase the risk.
Optic Neuritis: Although less common in this age group, optic neuritis can cause vision loss and is associated with conditions like diabetes.
Giant Cell Arteritis (GCA): While GCA is more common in older adults, the patient's age and symptoms of vision loss make it a consideration, especially if there are accompanying symptoms like headache or jaw claudication.
Diabetic Retinopathy: Given the patient's diabetes, diabetic retinopathy is a possible cause of vision loss, especially if not well-managed.

Stroke or Transient Ischemic Attack (TIA): Vision loss can be a symptom of a stroke or TIA, particularly if it's accompanied by other neurological deficits. Given the patient's history of hypertension, hyperlipidemia, and diabetes, this is a critical diagnosis not to miss.
Pituitary Apoplexy: Although rare, pituitary apoplexy can cause sudden vision loss and is a medical emergency requiring prompt treatment.
Carotid Artery Dissection: This condition can lead to vision loss due to decreased blood flow to the eye and is associated with a high risk of stroke.

Ocular Migraine: While migraines can cause visual disturbances, they are less likely to cause permanent vision loss and are not typically associated with the patient's age and medical history.
Vitreous Detachment: Posterior vitreous detachment can cause floaters and flashes of light but is less likely to cause sudden, complete vision loss in one eye.
Intraocular Tumors: Tumors like melanoma can cause vision loss but are less common and would likely have other accompanying symptoms or signs.