Dirt in front of the eye

A man visited an ophthalmologist. He said to the receptionist about his disease. The man complained, "I always see the dirt in front of the eyes."

The receptionist asked, "Do you see a doctor?" and the man replied, "No. Only the dirt." Not long after patients are in,

Patient: I always see the dirt in front of the eyes.

Doctor: Is not the new glasses help?

Patient: Of course, now I see the dirt far more clearly