There are many causes of dizziness and blurred vision, for example, some normal people who suddenly rise after squatting may experience temporary cerebral ischaemia and present with temporary blurred vision; upright postural hypotension, anaemia, hypoglycaemia and other systemic diseases can all cause dizziness and blurred vision. Ophthalmic diseases such as cataracts and presbyopia can also, in part, manifest symptoms of dizziness and lightheadedness. In addition, taking certain medications, such as ketotifen fumarate, can also manifest as dizziness.