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20 Cards in this Set
- Front
- Back
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What type of color vision defect would you expect with an optic nerve disorder?
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red/green color defect
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Is chromotopsia a true color vision defect?
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No, chromotopsias do not produce a decreased ability to see colors.
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How many hues are in the 100 hue test?
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85
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How many of the Nagel anomaloscopes three primary colors (red, green, blue) are absorbed by S-cones?
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none
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What is the purpose of the X-chrom lens?
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enhance color discrimination in dichromats and anomalous trichromats
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What type of chromotopsia may occur secondary to cataract extraction?
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cyanopsia
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In what type of color vision deficiency would a patient report a halo?
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chromotopsia
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What type of color vision defect does digitalis produce?
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xanthopsia
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What type of color vision defect would sodium fluroescein produce?
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xanthopsia
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Would D-15 test would be better for detecting minor defects?
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desaturated D-15
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Can the D-15 test distinguish between a protanomalous dichromat from a protanope?
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D-15 cannot different dichromats from anomalous trichromats
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How many cycles per degree is 20/20 vision?
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30 cycles per degree
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How many cycles per degree is 20/10?
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60 cycles per degree
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What spatial frequences will corneal edema effect?
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all spatial frequencies
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A transluscent lens causes degradation of what spatial frequencies?
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all spatial frequencies
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At what spatial frequency are human beings most sensitive?
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4 cpd
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What is the name that refers to the packing density of photoreceptors as relating to acuity?
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Nyquist's theorem
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At what spatial frequencies will contrast sensitivity be effected by scarring due to contact lenses?
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moderate spatial frequency
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Does the hyperacuity decrease due to cataract patient?
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No
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What is the threshold of Vernier acuity?
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3 seconds of arc
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