Untitled Flashcards Set

The ciliary muscle:
B) Controls the shape of the lens to allow focusing.

The gel-like substance that reinforces the eyeball and prevents it from collapsing inward is the:
D) Vitreous humor.

An astigmatism results from unequal curvatures of the cornea or lens.
A) True

What structure of the eye focuses light on the retina?
A) Lens

The overlapping of the two visual fields that provides for depth perception (3-D vision) results in:
B) Binocular vision

The ability of the eye to focus on close objects is known as:
C) Accommodation

Fibers from the medial side of each eye cross over to the opposite side of the brain at the:
D) Optic chiasma

Which is not a component of the vascular tunic of the eye?
D) Sclera

Rhodopsin is a molecule made of:
B) Protein and vitamin derivative.

We cannot see images formed on the optic disc.
A) True

Which one of the following correctly lists the order of the parts through which light passes as it enters the eye?
C) Cornea, aqueous humor, lens, vitreous humor

In nearsightedness:
B) Distant objects are blurry because the image is focused in front of the retina.

Vitamin A deficiency can lead to:
C) Night blindness

The fovea:
B) Is the region of the retina filled with cones that allows the most acute vision.

Sebaceous glands situated between the eyelashes release an oily secretion that lubricates the eye.
A) True

The aqueous humor of the eye is reabsorbed into venous blood through the:
C) Canal of Schlemm

Where do tears drain?
C) Into the nasal cavity

The eyes are not protected by the:
E) Both A (Pupil) and D (Conjunctiva) are correct.

The normal resting eye is generally "set" for distant vision.
A) True

Presbyopia is a condition resulting from:
A) Loss of lens elasticity.

Cones are:
E) All of these (Sensitive to red, green, and blue light, and relatively insensitive to dim light).

The function of the choroid layer of the eye is to:
A) Prevent light from scattering inside the eye.

The _ gland is located above the lateral end of each eye and releases tears.
A) Lacrimal

A thin, transparent mucous membrane that covers the inner surface of the eyelids and the anterior surface of the eye is the:
D) Conjunctiva

Eye layer made of nervous tissue → BE) Retina

Regulates the amount of light entering the eye → BD) Pupil

"White of the eye" → CE) Sclera

Colored portion of the eye → AD) Iris

Moves and supports the eyeballs → Extrinsic eye muscles

Flexible, transparent, and biconvex → ABE) Lens

The blind spot → AE) Optic disc

"Window" of the eye → D) Cornea

Provides nutrients to the cornea and lens → Aqueous humor

Photoreceptors used in dim light → CD) Rods

Hole in the center of the iris → BD) Pupil

Smooth muscle that controls the shape of the lens → Ciliary body

Structure that refracts light to focus on the retina → Cornea