special senses: visual tests and experiments Flashcards Preview

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Flashcards in special senses: visual tests and experiments Deck (12):
1

• Accommodation

o The ability for an eye to focus differentially for objects of near vision (less than 6m, or 20 feet)

2

• Real image

o Reversed form left to right
o Inverted
o Smaller than object

3

• Emmetropic eye/ normal eye

o Able to accommodate properly

4

• Near point of accommodation

o Test for lens elasticity

5

• Vision acuity

o Sharpness of vision
o Teste with Snellen eye chart

6

• Depth perception or three-dimenional vision

o When the primary visual cortex fuses the slightly different images

7

• Lens selection disc

o Set of lens mounted on a rotating disc on a opthalmoscope

8

• Rheostat control

o A mirror that reflects the light so that the eye interior can be illuminated in opthalmoscope

9

• Myopia

o Nearsightedness
o Individuals in whom the image normally focuses in front of the retina

10

• Hyperopia


o Farsightedness
o The image focuses behind the retina

11

• Astigmatism

o Irregularities in the curvatures of the lens and or the cornea that lead to blurred vision

12

• Presbyopia

o Old vision
o When the elasticity of the lens dramatically decreases with age