The main causes of dizziness and eyestrain are the following: 1. Sleep deprivation and excessive eye use, mostly due to long-term late nights and poor sleep quality, can cause dizziness and drowsiness, which is caused by insufficient blood supply to the cerebral arteries because the brain nerves do not get sufficient rest. If you read a book or a cell phone for a long time, you may also experience dizziness and eyestrain. 2. Insufficient blood supply to the cerebral arteries, such as dyslipidemia and hypertension, may cause headache and weakness. The diagnosis can be confirmed by checking the cervical MRI. It is best to go to the hospital to find out the cause and treat the symptoms.