Color Vision 3 Flashcards
What’s the most common inherited CV disorder?
Red-Green
- 1 in 12 males
- 1 in 200 females
Dichromats are termed the _______. What are they missing?
- anopia
- missing 1 of 3 photopigments
Anomalous trichromats are termed _______. What is wrong with them?
- anomaly
- all 3 cones are present, but one cone is different/malfunctioned
In deuteranopia, what cone photopigment is missing? What replaces it?
- chorolabe (green) is missing
- erythrolabe replaces it
In protanopia, what cone photopigment is missing? What replaces it
- Erythrolabe is missing
- Chorolabe replaces it
In tritanopia, what cone photopigment is missing?
Cyanolabe
This model describes when the missing photopigment is replaced by a remaining photopigment.
Replacement model of Dichromacy
What is the most common color vision anomaly?
Deuteranomaly
deuteranomalous trichromacy
In Deuteranomalous Trichromacy, chorolabe is displaced where?
- chorolabe is displaced toward longer wavelengths (toward the right)
In Protanomalous Trichromacy, erythrolabe is displaced where?
- erythrolabe is deplaced toward shorter wavelengths (to the left)
Deutan/Protan deficits confuse what 2 colors?
red and green (usually inherited)
Tritan deficits confuse what 2 colors?
blue and yellow
The Trichromat spectral sensitivity curve shows how many peaks?
3 peaks
In deuteranopia, the SSC shows how many peaks? Which one is missing?
- only 2 peaks
- missing MW peak
In protanopia, the SSC shows how many peaks? What’s missing?
- 2 peaks
- missing LW peak
This is the loci of color in a CIE diagram that appear identical to a dichromat.
Color Confusion lines
This is a point where the color confusion lines converge and meet on the chromaticity diagram
Copunctal (convergence) point
For protanopes, where is the copunctal point?
700nm
For tritanopes, where is the copunctal point?
400nm
For deuteranopes, where is the copunctal point?
outside the CIE diagram
Is the color at each copuntcal point real or imaginary?
imaginary
Protanopes and deuteranopes share a confusion line _____ to the spectral locus.
parallel
This is a spectral wavelength that a dichromat selects to match a specified white light
Neutral pint
What are the neutral points for protanopia, tritanopia and deuteranopia?
Protan = 492nm deutan = 498nm tritan = 569nm
At what wavelength do protanopes and deuteranoepes become monochromats?
beyond 545 nm
Can someone be a deuteranomalous dichromat?
NO
Which condition shows a significant change in luminance function compared to normal trichromats?
Protanopia
Which cones play a larger role in generating the photopic luminance function curve?
LWS cones
What will a person with protanopia have difficulty doing?
Seeing the red tail-lights on cars
Based on the W curve, what will a stimulus of 446 and 450 look like to a normal trichromat?
look similar
Based on the W curve, what will a stimulus of 500 and 504 look like to a normal trichromat?
looks different
Dichromats (protanopia/deuteranopia) have the best wavelength discrimination where?
490 and 495
If a person confuses wavelengths along the spectral locus of 540 and 680, what type of deficiency do they have?
Unknown; can’t tell based off that
