Eye and Ear Flashcards
Chapter 6
Myopia
a refractive error in which the light rays are brought to a focus in front of the retina resulting in difficulty viewing objects at a distance. Nearsightedness.
Otoscope
an instrument used to examine the external ear canal and tympanic membrane.
Presbyopia
a decrease in the elasticity of the lens that occurs with aging, resulting in a decreased ability to focus on close objects.
Refraction
the deflection or bending of light rays by a lens.
Tympanic membrane
a thin, semitransparent membrane between the external ear canal and the middle ear that receives and transmits sound waves. Also known as the eardrum.
Visual acuity
acuteness or sharpness of vision.
Astigmatism
a refractive error that causes distorted and blurred vision for both near and far objects due to a cornea that is oval shaped.
Audiometer
an instrument used to measure hearing acuity quantitatively for the various frequencies of sound waves.
Canthus
the junction of the eyelids at either corner of the eye.
Cerumen
a yellowish waxy substance secreted by glands in the ear canal which functions to lubricate and protect the ear canal. Earwax.
Hyperopia
a refractive error in which the light rays are brought to a focus behind the retina resulting in difficulty viewing objects at a reading or working distance. Farsightedness.
Impacted cerumen
cerumen that is wedged firmly together in the ear canal so as to be immovable.
Installation
the dropping of a liquid into a body cavity.
Irrigation
the washing of a body canal with a flowing solution.
The outer layer of the eye
sclera
