Disorders of the Eye
Lens of eyes gradually becomes cloudy
Causes a painful, gradual blurring and loss of vision
Pupil turns from black to milky white
Occurs in people over 70
Cataracts
Excessive intraocular pressure causing destruction of the retina and atrophy of the optic nerve
Caused by overproduction of aqueous humor, lack of
drainage, or aging
Symptoms develop gradually — mild aching, loss of peripheral vision, halos around light
Glaucoma
What is the outer ear, collects sound waves and directs them into the auditory canal?
Pinna
What is a cavity in the temporal bone?
Middle ear
Cones are affected
Genetic disorder that is carried by female and transmitted to males
Usually have difficulty distinguishing between reds,
greens and occasionally blues
Color blindness
Leading cause of vision loss
An incurable eye disease
Happens when the small central portion of your retina, called the macula, wears down
Macular degeneration
What separates the outer from the middle ear?
Tympanic membrane
How does the pharynx connect with the middle ear?
Eustachian tube
Commonly known as pink eye
Inflammation of conjunctiva
Symptoms are redness, pain, swelling, and discharge
Highly contagious
Conjunctivitis
Light focuses in front of the retina because eyeball too long
Concave lenses help
Myopia: Nearsighted
What is lined with glands that secrete a wax-like substance called cerumen that protects the ear?
Auditory canal
What transmits sound waves from the eardrum to the inner ear?
Ossicles
What is the spiral shaped organ of hearing that contains the cochlear duct?
Cochlea
An emergency situation where the retina pulls away from the layer of blood vessels that provides it with
oxygen and nutrients
Detached retina
Light focuses behind the retina because
the eyeball is too short
Objects must be moved farther away from the eye to be seen clearer
Convex lenses help
Hyperopia: Farsighted
What is filled with fluid that vibrates when sound waves are transmitted by the stapes?
Cochlear duct
What are the three tiny bones called ossicles?
Malleus (hammer), incus (anvil), and stapes (stirrup)
What are the three structures in inner ear that contain liquid set in motion by head and body movements?
Semicircular canals
Complication of diabetes that affects the eyes
Caused by damage of the blood vessels of the retina
Symptoms include: Spots or (floaters); Blurred vision;
Impaired color vision; Dark or empty areas in vision and Vision loss
Can result in blindness
Diabetic retinopathy
Lens loses elasticity, cannot focus on close or distant objects
Usually occurs after age 40
Presbyopia: ¨Old-sightedness¨
What is the delicate, hair-like cells inside the cochlear duct, picks up vibrations of fluid and transmits them as a sensory impulse along the auditory nerve to the brain?
Organ of corti
What equalizes the air pressure in the middle ear with the outside atmosphere?
Eustachian tube