It all depends on the degree of the corneal abrasion, as we all know corneal abrasion is a superficial scratch in the outer lens of the eye. It might be caused by inappropriate wearing of contact lenses or by particles that get lodged in your eyes. A scratched cornea can be painful and alert.
The lucky thing is that the eyes are one of the quickest healers in the body and scratched corneas are easy to recover. Some of the symptoms of corneal abrasions include pain, sensitivity to light, redness, excessive tears, blurred vision, and possible swelling of the eye.
In a word superficial cornea abrasions can not cause permanent blindness or loss of vision but it may blur your vision temporarily. Once your eye heals, it may take a few weeks before your clear vision returns (if you had clear vision before the abrasion). During this time, my suggestion is that refraining from touching your eyes, especially by your dirty hands.