What Are You Constantly Facing But Unable To See

What are you constantly facing but unable to see?

The future is the right response, so. Reason: This query is based on Riddle. Answer to this riddle is The future.Yesterday is the solution to the puzzle. Every person alive has witnessed yesterday, but they won’t ever experience it again. So yesterday is the answer to the riddle What is something you will never see again?

What is on each eye?

DISCLOSING YOUR EYEGLASS PRESCRIPTION The following is the meaning of the abbreviations: O. D. The term right eye (oculus dexter) refers to this. O. S. This is the left eye, or oculus sinister. O. U. This is called oculus uterque, or both eyes. The focusing power, or correction, of the lens your eye needs is measured in diopters, which are represented by these numbers. The abbreviation for diopter is D. For instance, if your prescription reads -1. Nearsightedness of this degree is considered to be mild.