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Sense Organs - Eye Terminology

AB
0.03Each blink is for _ seconds
6# of muscles control each eye's movement
30Blinking allows the eye to close approx _ minutes each day
1/6What percent of the eye is open to external environment?
2 to 10We blink every _ to _ seconds
AccommodationProcess whereby the lens changes shape to see objects at various distances
Aqueous HumorFluid in the eye that bathes the anterior region
BentAs light passes through the lens, it is _
ChangeTo focus light, the lens must _ its shape. 
ConjunctivaMembrane that lines the eyelid and covers the anterior of the eye
ConvergenceSimultaneous inward movement of both eyes (towards each other) in order to produce a single binocular vision of an object
Crystalline LensAdjusts the thickness and shape of the lens (refraction)
Ear & EyeTwo sense organs
ElasticityWith aging the lenses lose some _
EmmetropiaNormal vision
Fovea CentralisArea of sharpest vision
Lacrimal DuctsTear ducts
Lens AccommodationChanging of lens shape
Macula LuteaYellow spot in the center of the retina that contains the fovea centralis
Optic DiskRegion where optic nerve meets the retina and is insensitive to light
Optic DiskBlind spot
Optic NerveNerve carrying impulses - traveling to and from the brain
Reading GlassesProvide additional refraction the lenses can no longer provide.
RefractionBending of light rays (focusing)
RefractionFocusing
Sense OrganReceptors with sensitive cells activiated by a form of energy or stimuli in the internal or external environment
Snellen ChartRows of letters to be read from top to bottom - with gradual decrease in the size of lettering
Visual AcuitySharpness of vision tested with a Snellen chart
Vitreous ChamberCavity behind the lens containing vitreous fluid
Vitreous ChamberMaintains shape of eyeball


(AP) Human Geography Teacher
Lakeville South High School
Lakeville, MN

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