When i wake up, i have double/blurred vision in left eye. do i need an mri?

Eye exam: First you need a complete eye exam from an eye doctor (ophthalmologist). There are many possible reasons for double and blurry vision which cannot be diagnosed without a thorough exam. An MRI may be useful if the doctor has specific concerns about your brain, optic nerve, or the orbit. But this would be a secondary exam, not the first choice.