Visual & Auditory Key Terms

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Visual & Auditory Key Terms
2010-04-02 09:53:53
Visual & Auditory Key Terms from Ch 21 Lewis

Visual & Auditory
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  1. aqueous humor
    a clear watery fluid that fills the anterior and posterior chambers of the anterior cavity of the eye.
  2. astigmatism
    an unevenness in the corneal or lenticular curvature, causing horizontal and vertical rays to be focused at two different points on the retina, which results in visual distortion.
  3. conjunctiva
    the mucous membrane lining the inner surfaces of the eyelids and anterior part of the sclera.
  4. hyperopia
    farsightedness, or an inability of the eye to focus on nearby objects.
  5. lens
    biconvex, avascular, transparent structure located behind the iris.
  6. myopia
    nearsightedness, or an inability of the eye to focus on objects far away.
  7. nystagmus
    an abnormal involuntary repetitive movement of the eyes.
  8. presbyopia
    a hyperopic shift to farsightedness resulting from a loss of elasticity of the lens of the eye; the condition commonly develops with advancing age, with the first symptoms appearing about age 40 years.
  9. refraction
    the ability of the eye to bend light rays so that they fall on the retina.
  10. retina
    a layered nervous tissue membrane of the eye, continuous with the optic nerve, that receives images of external objects and transmits visual impulses through the optic nerve to the brain.
  11. sclera
    an opaque structure composed of collagen fibers meshed together that encircles the globe of the eye; commonly referred to as the "white" of the eye.
  12. tinnitus
    a subjective noise sensation, often described as ringing, heard in one or both ears.
  13. vertigo
    a sensation that a person or objects around the person are moving or spinning; usually stimulated by movement of the head.