Why do I have a constant blurry spot I'm my vision?

Constant blurry spot. Many issues can cause a constant blurry spot in your vision. If the spot is stationary and is always present, it is often related to an issue in the retina or less commonly optic nerve. If the spot moves about in your vision, then this usually related to a floater which typically does not cause any problems. You need to see a doctor to determine the cause of the spot.
Constant blurry spot. A constant blurred spot in your vision would suggest a retinal problem and should be evaluated by an ophthalmologist.