Color Vision Part 4

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What lightbulbs can you use for color vision testing?

1. Macbeth's easel lamp 2. non-standard fluorescent tubes - Richmond lamp 3. 100 watt tungsten bulb w/ C daylight glasses 4. indirect sunlight

What is the Y axis for the Rayleigh equation for a normal trichromat?

17

Farnsworth-Munsell 100-Hue test, Protan deficiency

1st order

Farnsworth-Munsell 100-Hue test, Deutan deficiency

2nd order

Farnsworth-Munsell 100-Hue test, Tritan deficiency

3rd order

What is the X axis for the Rayleigh equation for a normal trichromat?

45

What are examples of an arrangment test?

Farnsworth D-15 Lanthony D-15 100 Hue

What test is good for picking up acquired color deficiencies?

HRR - good at blue/yellow

What was the original test for color blindness?

Holmgren's Worsted Yarn

What D-15 test helps you determine milder defects?

Lanthony D-15

What is used to test S cones?

Moreland Equation

What is tested by the Farnsworth Lantern (FALANT)?

ability to distinguish red from green lights

The majority of acquired color deficiencies are ___ (red/green; blue/yellow).

blue/yellow - but there are still red/green

Severity of anomalous color vision is based on number of ___ seen when measured Farnsworth D-15.

cross-overs

What are the inherited color anomalies?

dichromats anomalous trichromats

True or false. Pseudoisocrhomatic tests work to differentiate dichromats and anomalous tritanopes.

false

True or false. Everything looks dimmer to a protanope at all wavelengths compared to a normal trichromat.

false - it depends on the wavelengths - some wavelengths will appear brighter to a protanope and some will appear dimmer - red (greater than 640nm) will look dimmer and green (less than 546nm) will look brighter

True or false. Ishihara picks up blue/yellow defects.

false - only red/green

True or false. The nagel anomaloscope checks for all color deficiencies.

false only red green not tritans

Deutan anomalous color cross over

follow along deutan axis

The 15 color caps in the Farnsworth D-15 form a ___ within the CIE diagram.

hue circle

What illuminant on the CIE diagram is the standard for color vision testing?

illuminant C (~6800) A is lower (~ 2800) B is middle (~ 4800)

What test is good for picking up inherited R/G deficiencies?

ishihara

Why is illuminant C ideal?

it simulates indirect sunlight

What is the shared color confusion line?

lines that protans and duetans struggle with

Matches seen by protanope on Nagel Anomaloscope

luminance changes hue changes

How do we differentiate deuteranopia from protanopia?

luminance function - protanopes (missing L cones) displace toward shorter wavelength - deuteranopes (missing M cones) displace toward longer wavelength

Matches seen by deuteranope on Nagel Anomaloscope

luminance stays the same - but they see more than the one match seen by the normal trichromat

How many matches will a dichromat or an anomalous trichromat make on a Nagel Anomaloscope?

multiple - all along confusion line

What is the only instrument that can distinguish between anopia (dichromats) and anomaly (anomalous trichromats)?

nagel anomaloscope

How many matches will a normal trichromat make on a Nagel Anomaloscope?

only 1 - 546 (green) and 679 (red) to make 570 (yellow)

What test differentiates protans from deutans?

pseudoisochromatic plates - protan won't see red 2 - deutans won't see 6

What plots the x axis on the nagel anomaloscope?

red to green - bottom half

The radius of the hue circle on the Lanthony D-15 is ___ (smaller; larger) than the Farnsworth D-15.

smaller

What is the Rayleigh equation?

somewhere along the x axis, there is a match for somehwere along the y axis

How do anomalous trichromats perform compared to dichromats and normal trichromats?

they are somewhere in between in protanomaly: - L cones luminance functions shifts toward M cones (to the left) in deuteranomaly: - M cone luminance functions shifts toward L cones (to the right)

The top half of the bapartite field on a nagel anomaloscope changes in ___ while the bottom half changes in ___.

top half = luminance bottom half = hue

True or false. All the color caps on the Farnsworth-Munsell 100 hue test have the same saturation, brightness, but a different hue.

true

The top half of the bitartite field on a nagel anomaloscope is always ___.

yellow

What plots the y axis on the nagel anomaloscope?

yellow field - the luminance


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