Like most healthcare professions, the education and certification of optometrists is regulated in most countries. Optometric professionals and optometry-related organizations interact with governmental agencies, other healthcare professionals, and the community to deliver eye- and vision-care.
The average length of an erect penis is 5.16 inches (13.12 centimeters) and the average circumference is 4.59 inches (11.66 centimeters), according to a new analysis of penis length studies involving more than 15,000 men around the world.
The average penis size is 3.4 inches erect. Anything exceeding 5 inches is incredibly rare, and over 7 inches is almost unheard of. The largest penis ever officially measured was 8.1 inches long and belonged to a man from Albania. Source(s): Expert with 34 years experience.