VSP: Color Vision Anomalies

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Author:
linhhong
ID:
83310
Filename:
VSP: Color Vision Anomalies
Updated:
2011-05-02 18:33:35
Tags:
color vision
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Description:
Things to memorize in VSP color vision anomalies notes.
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  1. Typical Complete Monochromatism
    Functioning photopigments...?
    Inheritance...?
    • Rods only
    • Autosomal recessive

    • Symptoms:
    • - VERY few, if any, cones
    • - no photopic dark adaptation
    • - normal scotopic ERG, no photopic ERG
    • - photophobia
    • - poor VAs (~20/100-20/200)
    • - nystagmus common
    • - no wavelength discrimination
  2. Atypical Incomplete Monochromatism
    Functioning photopigments...?
    Inheritance...?
    • Rods and S Cones
    • x-linked recessive

    • Symptoms:
    • - abnormal VAs (~20/60-20/80)
    • - abnormal photopic/scotopic dark adaptation
    • - abnormal photopic/scotopic ERG
    • - photophobia
    • - mild nystagmus (if VA poorer than 20/60)
  3. Atypical Cone Monochromatism
    Functioning photopigments...?
    Inheritance...?
    • Cones (something wrong in the brain)
    • inheritance unknown

    • - everything is normal
    • - wavelength discrimination poor to none
  4. Which color anomaly is the result of inTERgenic crossover?
    Dichromatism (Deuteranopia & Protanopia)
  5. Which color anomaly is the result of inTRAgenic crossover?
    Anomalous Trichromatism
  6. Deauteranopia:
    Neutral point?
    Copunctal point on CIE?
    • 498nm
    • off of the CIE diagram
  7. Protanopia:
    Neutral point?
    Copunctal point on CIE?
    • 492nm
    • bottom right of CIE diagram
  8. Tritanopia:
    Neutral point?
    Copunctal point on CIE?
    Inheritance?
    • 569nm
    • bottom left of CIE diagram
    • autosomal dominant
  9. Protanomalous Trichromat:
    Point of least saturation?
    Inheritance:
    • 492nm
    • x-linked recessive
  10. Deuteranomalous Trichromat:
    Point of least saturation?
    Inheritance:
    • 498nm
    • x-linked recessive
  11. Tritanamalous Trichromat:
    Point of least saturation?
    Inheritance?
    • 570nm
    • autosomal dominant
  12. Photopigment is made up of:
    (__?__) + (__?__)
    chromophore + opsin
  13. Shorter/Longer wavelengths appear brighter (choose one).
    Shorter
  14. Deuteranomaly:
    Spectral sensitivity curve is shifted to the...?
    right (towards the red curve)
  15. Protanomaly:
    Spectral sensitivity curve is shifted to the...?
    left (towards the green curve)
  16. For which condition, deuteranopia or protanopia, is the photopic luminosity function similar to that of trichromats?
    Deuteranopia
  17. Ability to discriminate among different wavelengths worsens with prolonged viewing until they behave as a dichromat. Exhibited by some anamalous trichromats and even some normal trichromats.
    Color Asthenopia
  18. Poor color discrimination that is NOT associated with any documentable pathology or genetic defect.
    Color Amblyopia
  19. KOLLNER'S RULE:
    Acquired Blue-Yellow defects are from...?
    Acquired Red-Green defects are from...?
    • Blue-Yellow (tritan):
    • - ocular media (ex: nuclear cataract)
    • - choroid
    • - outer retina (ex: ARMD)
    • exceptions: diabetic retinopathy, glaucoma, papilledema, dominantly inherited optic atrophy)

    • Red-Green (protan/deutan):
    • - inner retina (ex: toxic amplyopia, papillitis, Stargardt's)
    • - optic nerve
    • - neural pathways (ex: optic neuritis/MS)
  20. "Color Temperature" should be used to describe only ____________ light sources.
    incandescent
  21. "Correlated Color Temperature" should be used to describe only ____________ light sources.
    non-incandescent
  22. CIE Chromaticity Diagram Loci:
    1) Curved part that has all spectral wavelengths?
    2) Straight line at bottom?
    3) The line of various standard illuminants, considered white light?
    • 1) Spectral Locus
    • 2) Purple Locus (Non-spectral purples)
    • 3) Planckian Locus
  23. Temperature for Illuminant C?
    6774 K (hottest one!)
  24. Function of Illuminant D65?
    Corrects for weaknesses of other standard illuminants in near UV.
  25. Chromatopsia:
    Yellowish tint in vision?
    When might it occur?
    Xanthopsia

    • Temporary side-effect of flouresscein angiography.
    • Also associated with digitalis poisoning.
  26. Chromatopsia:
    Blueish tint in vision?
    When might it occur?
    Cyanopsia

    Frequently described by patients immediately after nuclear sclerotic cataract extraction.

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