Color vision

Question 1

What is color vision?

Answer 1

The ability to discriminate light solely based upon wavelength

Question 2

What is hue euivalent to in photometry?

Answer 2

Dominant wavelength

Question 3

What is brightness equivalent to in photometry?

Answer 3

Luminance

Question 4

What is saturation equivalent to in photometry?

Answer 4

Purity

Question 5

What does equal stimulation of cones result in?

Answer 5

White light

Question 6

What is protan?

Answer 6

Anomaly with erythrolabe or L cone

Question 7

What is deutan?

Answer 7

Anomaly with chlorolabe or M cone

Question 8

What is tritan?

Answer 8

Anomaly with cyanolabe or S cone

Question 9

Protanopes

Answer 9

Missing L cone

Question 10

Deuteranopes

Answer 10

Missing M cone

Question 11

Tritanopes

Answer 11

Missing S cone

Question 12

Anomalous trichromats

Answer 12

Have all three cones, with a deficiency of one

Question 13

What percentage of males have deuteranomaly?

Answer 13

5%

Question 14

What percentage of males have overall red-green deficiency?

Answer 14

8%

Question 15

What does spectral sensitivity determine?

Answer 15

Perceived brightness

Question 16

Protanope V(wavelength) curve

Answer 16

Displaced toward shorter wavelengths

Peak at 540nm

Question 17

Deuteranope V(wavelength) curve

Answer 17

Displaced toward longer wavelengths

Peak at 560nm

Question 18

What is wavelength discrimination?

Answer 18

A measure of hue discrimination

Question 19

What do confusion lines represent?

Answer 19

The locus of points on the CIE color space that cannot be dsitinguished based on their chromaticities

Question 20

What do spaces between confusion lines represent?

Answer 20

A noticeable change in wavelength

Question 21

McAdam’s ellipses

Answer 21

Confusion ellipses for trichromats

Question 22

What is the copunctal point?

Answer 22

Where all confusion lines meet

Question 23

What is a neutral point?

Answer 23

Where the confusion line that passes through white intersects the spectrum locus
Is confused with white

Question 24

Where is the neutral point for a protanope?

Answer 24

494nm

Question 25

Where is the neutral point for a deuteranope?

Answer 25

500nm

Question 26

Where is the neutral point for a tritanope?

Answer 26

570nm

Question 27

Do anomalous trichromats have a neutral point?

Answer 27

No, but they have abnormal saturation perception

Question 28

What three things does color vision testing give?

Answer 28

Normal or abnormal? Severity Type

Question 29

What principle does PIP use?

Answer 29

Color confusions

Question 30

Transformation plate

Answer 30

Color normal sees symbol | Color defective sees different symbol

Question 31

Vanishing plate

Answer 31

Color normal sees symbol | Color defective does not

Question 32

Hidden plate

Answer 32

color normal does not see symbol | Color defective does

Question 33

Diagnostic plate

Answer 33

Diagnose different classes of color deficiencies

Question 34

What color defect does the Ishihara plate test?

Answer 34

red-green

Question 35

Will HRR or Ishihara give severity?

Answer 35

HRR

Question 36

Does HRR or Ishihara have a tritan plate?

Answer 36

HRR

Question 37

How many cross-over errors are normal?

Answer 37

0

Question 38

How many single placement errors are normal?

Answer 38

1

Question 39

What is the most accurate instrument for diagnosis or red-reen color defects?

Answer 39

Anomaloscope

Question 40

Which test differentiaties between dichromats and anomalous trichromats?

Answer 40

Anomaloscope

Question 41

Mixtrue field

Answer 41

670nm and 546nm mixture

Question 42

Test field

Answer 42

Fixed wavelength of 590nm

Question 43

What defect will cause a lower luminance number than a trichromat?

Answer 43

Protan

Question 44

What lighting standard is used for testing?

Answer 44

Standard illuminant C

Question 45

Which type of defect is usually bilateral and symmetirc?

Answer 45

Congenital

Question 46

Which type of defect can be unstable over time

Answer 46

Acquired

Question 47

What can cause a blue-yellow defect?

Answer 47

Diseases of the outer retina and ocular media

Question 48

What can cause a red-green defect?

Answer 48

Diseases of the inner retina and the visual pathways or cortex

Question 49

Achromatopsia

Answer 49

Patient behaves as a monochromat

Question 50

How is rod monochromacy inherited

Answer 50

Autosomal recessive

Question 51

How can you help a rod monochromat

Answer 51

Red lenses

Question 52

What is a blue-cone monochromat

Answer 52

Patient has rods and S cones

Question 53

How is blue-cone monochromacy inherited

Answer 53

X-linked recessive manner

Question 54

How do you help a blue-cone monochromat

Answer 54

Magenta glasses

Question 55

Why is chromatopsia not a true color vision defect

Answer 55

Does not reduce the ability to discriminate colors

Question 56

What is a common cause of chromatopsia

Answer 56

Nuclear cataract

Question 57

What is cyanopsia

Answer 57

Blue tinge experience by patients due to more blue light hitting the retina

Question 58

How are congeital red-green defects inherited

Answer 58

X-linked recessive manner

Question 59

How are congeital tritan defects inherited

Answer 59

Autosomal dominant fashion