Untitled Flashcards Set

Ciliary muscle

Controls the shape of the lens to allow focusing.

Vitreous humor

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

Astigmatism

Results from unequal curvatures of the cornea or lens.

Lens

The structure of the eye that focuses light on the retina.

Binocular vision

The overlapping of the two visual fields that provides for depth perception (3-D vision).

Accommodation

The ability of the eye to focus on close objects.

Optic chiasma

The point where fibers from the medial side of each eye cross over to the opposite side of the brain.

Sclera

Not a component of the vascular tunic of the eye.

Rhodopsin

A molecule made of protein and vitamin derivative.

Optic disc

The part of the eye where we cannot see images formed.

Light pathway through the eye

Order of light passage: Cornea, aqueous humor, lens, vitreous humor.

Nearsightedness

A condition where distant objects are blurry because the image is focused in front of the retina.

Night blindness

A condition that can occur due to Vitamin A deficiency.

Fovea

The region of the retina filled with cones that allows the most acute vision.

Sebaceous glands

Release an oily secretion that lubricates the eye.

Canal of Schlemm

Where the aqueous humor of the eye is reabsorbed into venous blood.

Tears drainage

Tears drain into the nasal cavity.

Pupil

One of the eye parts that does not offer protection.

Resting eye

The normal state of the eye, generally set for distant vision.

Presbyopia

A condition resulting from loss of lens elasticity.

Cones

Photoreceptors in the eye that are sensitive to red, green, and blue light.

Choroid layer

The function is to prevent light from scattering inside the eye.

Lacrimal gland

The gland located above the lateral end of each eye that releases tears.

Conjunctiva

A thin, transparent mucous membrane covering the inner surface of the eyelids and the anterior surface of the eye.

Retina

The eye layer made of nervous tissue.

Pupil

Regulates the amount of light entering the eye.

Sclera

The part of the eye known as the 'white of the eye'.

Iris

The colored portion of the eye.

Extrinsic eye muscles

Move and support the eyeballs.

Lens

The flexible, transparent, and biconvex structure of the eye.

Optic disc

The blind spot in the eye.

Cornea

Referred to as the 'window' of the eye.

Aqueous humor

Provides nutrients to the cornea and lens.

Rods

Photoreceptors used in dim light.

Pupil

The hole in the center of the iris.

Ciliary body

The smooth muscle that controls the shape of the lens.

Cornea

The structure that refracts light to focus on the retina.