You can flush the eye with saline twice daily (just plain saline, not made for contacts but for lubrication). Just drip it into the inner corner of the eye and let it run out the outer corner. Then blot it dry. This could be a scratch from an inverted eye lash. They are very common.
If the haziness does not improve, a vet visit will be needed. You don't want to mess around with ocular health.
Let me know if you still have questions.