Anatomy of the Eye

Flashcards about the anatomy of the eye.

What muscles help control eye movement?

Eye muscles

Superior and inferior __ muscles control the eyes.

Rectus

Medial and lateral __ muscles control the eyes.

Rectus

Superior and inferior __ muscles control the eyes.

Oblique

What is the function of the lacrimal apparatus?

Manufactures and drains tears to the eyes to keep it moist and keeps debris away

Tears are composed of what?

Salt, mucus, and bactericidal enzymes

What structure do tears empty into?

Nasal lacrimal ducts

What are the three layers of the internal structures of the eye?

Fibrous tunic, sclera, and cornea

What is the sclera?

Thick, white, opaque structure composed of collagen fibers meshed together and is known as the white of the eye

What is the anterior portion of the sclera?

Cornea

The cornea is innervated by which cranial nerve?

Cranial nerve number five

What is the watery fluid in front of the lens and the anterior chamber of the eye?

Aqueous humor

What is the junction of the sclera and the cornea called?

Canal of Schlim

What colors are cones sensitive to?

Red, green, or blue

What is the transparent jelly-like substance that gives shape to the eye?

Vitreous humor

What are the four basic processes necessary to form an image?

Refraction, accommodation, constriction, convergence

__is how the eye is able to bend light rays so that those rays will fall onto the retina.

Refraction

__is how the eye can focus on objects at various distances.

Accommodation

Involuntary rhythmic movements of the eyes

Nystagmus

What is the most commonly performed visual acuity test?

patient is placed 20 feet from the chart, and they're asked to read lines

__ indicates that the patient has normal vision, and they can read at 20 feet from that prescribed line.

Twenty twenty

What does slit lamp examination view?

Eyelid, sclera, iris, conjunctiva, and the cornea

IOP is measured by __.

Tonometry

What is total blindness defined as?

No light perception and no usable vision

The primary concern for a blind person is what?

Safety