There is circle of blurriness in my eyesight, what could it mean?

PVD: You could have had a posterior vitreous detachment (when the jelly of the eye seperates from the retina and changes in consistancy leaving blurred areas of jelly in the eye). When the jelly pulls from the optic nerve, it can leave a circle shape and cuase a circle of blurriness.

Floater: When the vitreous gel separates from the retina posteriorly, there is sometimes a round or ring shaped bit of tissue called a weiss ring.

Cataract: There are over fifty types of cataracts that iclude inheritence, medication induced, normal without symptoms or the first clue to onset of dm> you need a complte thorough examination by an eye md.