What Can You See? Trivia Quiz

Answer: Iris

The main job of the iris is to control the size of the pupil. It also controls the amount of light that makes it to the retina. The color of the eye is controlled by genetics, with the majority of people on the earth having brown eyes.

Answer: Retina

The optic part of the retina is the portion of the eye that receives visual light rays. The ciliary and iridial parts of the retina are layer of supporting epithelial cells over the ciliary body. They are also the posterior surface of the iris.

Answer: Protection

The eyebrow protects the eye from sweat, rain and small items. The way they are shaped and the direction of the hairs causes moisture to flow sideways around the eye and down the side of the face. They also provide expression and shade to the eyes. They are used for communication, but this came later and was not their primary purpose.

Answer: Cataract

Cataracts develop when protein builds up on the lens of the eye. This prevents light from passing through clearly and is a common sign of aging. They are the most common type of preventable blindness. They can be caused by cigarette smoke, air pollution and heavy drinking.

Answer: Pupil

The black circle in the center of your eye is the pupil. It is the location through which light passes to the retina. It grows in size in relationship to the available light. The more light there is the smaller the pupil is.

Answer: Rod cells

Rod cells are very sensitive to the light. They respond to dim light or dark conditions. They are the cells that help people see in the dark. But rod cells do not differentiate between colors and have a very low measure of detail.

Answer: Pinkeye

Conjunctivitis is commonly known as pinkeye. It is an infection of the conjunctiva, which is the clear layer that covers the front of your eye. This can be caused by allergies, viruses or bacterial infections.

Answer: False

This is false. The fovea is simply a small depression in the retina. It is the location of the eye where visual acuity is the highest. This is the location where the field of vision is focused and where the cones are located.

Answer: False

Strabismus is the term for crossed eyes not for different colored eyes. This can be caused by trauma, infection, or present at birth and is a problem that can be treated by surgery.

Answer: The gelatinous part of the eye

The eye has a lot of clear gel-like substance known as the vitreous humor. It occupies the space behind the lens and in front of the retina at the back of the eye. This substance is made of water, collagen, salt and sugar.