What Is the Optic Disk

question 70

Multiple Choice

What is the optic disk?

• A) a tiny spot in the center of the fovea where there is a high concentration of rods and cones
• B) the portion of the lens which focuses incoming light
• C) the point at which the optic nerve fibers leave the back of the eye
• D) a transparent membrane which lies just behind the pupil of the eye and that helps funnel light waves to the retina

---

Definitions:

Church Attendance

The practice of going to church services, which reflects religious commitment and involvement in a faith community.

Young Republic

A term often used to describe the United States during the early years of its establishment and development as an independent nation, following the American Revolutionary War and during the early 19th century.

Erie Canal

A canal in New York, USA, that is part of the east-west, cross-state route of the New York State Canal System. Originally, it ran 363 miles from where Albany meets the Hudson River to Buffalo at Lake Erie, completed in 1825 and significantly impacting the development of the American Northeast and Midwest.

John Jacob Astor

A German-American businessman, merchant, real estate mogul, and investor known for being one of the wealthiest people in America in the early 19th century, notably in the fur trade and for purchasing vast amounts of land in New York City.