Lisinopril is a blood pressure medication. It causes side effects in some patients. The most common side effect is a persistent cough. While most Lisinopril side effects are harmless, you should be aware of serious side effects, which can indicate an allergic reaction. Vision loss or impairment is unlikely because of Lisinopril alone. Since you re hypertensive and borderline Diabetic too, I suppose you check your Fundoscopy from an Ophthalmologist done as soon as possible. Both Hypertention and Diabetes are causes of eye pathologies. Hope you found the answer helpful.