Eye Study Guide

How many cones are in the eye?

4.5 million

How many rods are in the eye?

91 million

What is the ability of the eye to focus on close objects?

Accommodation

Which of the following is a sex-linked condition that more often affects males?

Color blindness

Which one of the following correctly lists the order of the parts through which light passes as it enters the eye?

Cornea, aqueous humor, lens, vitreous humor

Which disorder of the eye results from increased pressure due to a buildup of aqueous humor?

Glaucoma

Which gland is located above the lateral end of each eye and releases tears?

Lacrimal

What separates the aqueous humor in the anterior segment from the vitreous humor in the posterior segment of the eye?

Lens

The inability to see distant objects is termed "nearsighted" or ________.

Myopia

Is this statement about the function of the pupil correct?

The pupil regulates the amount of light entering the eye, so we can see as clearly as possible.

Mrs. Davis is looking forward to improved vision after lens replacement surgery. She was evaluated to have ________.

cataracts

A person with total color blindness may lack ________.

cones

The transparent portion of the fibrous layer of the eye is the ________.

cornea

Protective shield of the eye is the

eyelids

The biconvex structure that focuses light on the retina is the ________.

lens

The vision organ is the

retina

The fibrous covering of the eye consists of the white outer layer known as the ________, and a transparent portion known as the ________.

sclera; cornea

The aqueous humor of the eye is reabsorbed into venous blood through the ________.

scleral venous sinus (canal of Schlemm)

The only special sense that is not fully functional at birth is ________.

vision

The gel-like substance that reinforces the eyeball and prevents it from collapsing inward is the ________.

vitreous humor (body)

What part of the retina absorbs light and prevents it from scattering inside the eye?

Pigmented layer

What are the three colors of cones in the eye?

Red, green, and blue

Which layer of the eye contains photoreceptors known as rods and cones?

Retina

Which layer of the eye contains rods and cones?

Retina

What type of photoreceptor cell allows us to see gray tones in dim light, and provides our peripheral vision?

Rods