Colour Vision Flashcards
Anomalous trichromat
Limited discrimination, but still contains all three photopigments.
Protanomlous trichromat
Sensitivity spectrum shifted to lower wavelengths, less sensitive to longer wavelengths. Red weak. Requires more red to match.
Deuteranomolous trichromat
Sensitivity spectrums hifted to longer wavelengths. Green weak. Requires more green to match.
Tritanomaly
Inherited blue-yellow wavelength spectrum shift. More rare.
Monochromatism/Achromatopsia
Rare condition of not being able to distinguish colours. They only have one retinal cone or lack all cone function/rod monochromat.
Protanope
Red deficient/lack erythrolabe - sensitivity reduced in the higher wavelengths.
Deuteranope
Green deficient/lack chlorolabe
Tritanope
Inherited blue-yellow deficiency
True/False: Nagel anomolascope can differentiate trichromacy and dichromacy.
TRUE: can distinguish between anomolous trichromacy and dichromat.
Most likely to have red/green colour defects?
Male.
Bilateral and stable usually.
Cause of acquired blue/yellow colour defects?
Outer retinal disease
Cause of acquired red/green colour defects?
Inner retina/optic nerve or visual pathway abnormalities, asymmetric or unilateral, progressive
