V151 Test #2

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Author:
Kwytovak
ID:
245497
Filename:
V151 Test #2
Updated:
2013-11-06 18:18:19
Tags:
V151
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Description:
V151 test 2
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  1. Angular extent of monocular field of vision.
    • Nasal = 60 Degrees
    • Temporal = 100 Degrees
    • Superior = 60 Degrees
    • Inferior = 75 Degrees
  2. Visual Pathway through the brain
    • Nerve fiber anatomy
    • optic nerve head/ optic nerve
    • chiasm
    • optic tract
    • Lateral Geniculate Nucleus or Body
    • optic radiation
    • visual cortex
  3. Absolute Defect
    no stimulus perceived anywhere in the affected field –blind to all stimuli
  4. Relative Defect
    has less than normal sensitivity but some stimuli are detected.

    VF defect changes in size inversely with change in size and/or intensity of stimulus
  5. Types of VF defects Amsler's grid detects
    metamorphopsia caused by central lesions (ARMD)
  6. Acronym for normal pupil
    • P - Pupils
    • E - Equal
    • R - Round
    • R - React to
    • L - Light
    • A - Accommodation(near)
  7. autonomic nervous system
    Sympathetic - Stress Response (fight or flight)

    Parasympathetic - Calm, Relaxed state
  8. Horner's Syndrome
    Classic Triad: ptosis, miosis, and anhidrosis of face on affected side
  9. Iris Muscles
    Sphincter - Miosis (constricts pupil)

    Dilator - Midriasis (Dilates Pupil)
  10. Stereopsis levels of fusion
    each eye sees an object from a slightly different angle.  The brain fuses the images into one 3D image.
  11. levels of stereopsis
    • Gross Stereopsis - fly - 3000 sec. of arc
    • Intermediate - 3 rows of animals - 400, 200, and 100 sec. of arc
    • Fine - 10 groups of 4 rings - measure up to 20 to 40 sec of arc
  12. Color vision tests
    • Ishihara PIP (most common)(no blue/yellow)
    • Farnsworth-Munsell D-15 Dichromatous
    • Farnsworth-Munsell 100 Hue test
    • Farnsworth Lantern test
    • Nagel anomaloscope
  13. colors affected in acquired color deficiency
    usually blue/yellow defects

    caused by: cataracts, retinal disease, optic nerve disease
  14. most common color weaknesses found in inherited color deficiencies
    Red (protanomalous)

    Green (deuteranomalous)

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