Short Quiz on COLOUR VISION & COLOUR BLINDNESS

Instruction

1. This Test has 11 Questions 
2. There is 1 Mark for each correct Answer

11

MCQ – 1

The colours best appreciated by the central cones of our foveo-macular area are :

Read and blue

Blue and green

Red and green

Blue and yellow

MCQ – 2

True about color blindness

Age related

Hereditary

Males only

Female only

MCQ – 3

True about color blindness:

More common in male

More common in female

Age related

b and c

MCQ – 4

A person has defective blue colour apprec-iation. His condition is better named as

Deuteranomalous

Deuteranopia

`Tritanopia

Tritanomalous

MCQ – 5

Protonopes have defect in identifying which colour

Red

Blue

Green

Black

MCQ – 6

Any spectral colour can be matched by a mixture of three monochromatic lights (red, green, blue) in different proportions. If a person needs more of one of the colour for matching than a normal person, then he has a colour anomaly. More red colour is needed in the case of :

Deuteranomaly

Tritanomaly

Protonomaly

Tritanomaly

MCQ – 7

Regarding color blindness true:

Mainly congenital

Can be testes with Fansworth 100 hue test

Isihara chart test red/green color blindness 

All

MCQ – 8

Congenital colour blindness is transmitted as:

Recessive disorder

Autosomal dominant

Sex-linked disorder

All of the above

MCQ – 9

Acquired blue blindness is a feature of:

Increased sclerosis of the crystalline lens

Disease of optic nerve

Disease of macula

All of the above

MCQ – 10

Most common type of colour blindness is:

Protanopes

Deuteranopes

Tritanopes

None

MCQ – 11

A person has defective blue colour appreciation. His condition is better named as-

Deuteranomalous

Deuteranopia

Tritanopia

Tritanomalous

MCQ – 1

The colours best appreciated by the central cones of our foveo-macular area are :

Read and blue

Blue and green

Red and green

Blue and yellow

Explanation :

D i.e. Blue & yellow 

Macular lesion tends to produce blue-yellow Q defects and optic nerve lesions produce red green defects Q


MCQ – 2

True about color blindness

Age related

Hereditary

Males only

Female only

Explanation :

B i.e. Hereditary Colour Blindness (Achromatopsia)

  • An individual with normal colour vision is k/a trichromate. In colour blindness, faculty to appreciate one or more primary colours is either defective (anomalous) or absent (anopia). It may be congenital or acquired.
  • Colour blindness is usually a hereditary condition that is present by birth, and though it is more common in males, it can occur in females also. It can also be an acquired condition through diseases of optic nerve or macula but is not normal age-related phenomena. There is no treatment.
  • Red & green pigment cones are coded on X-Chromosome and Blue cones on Chromosome 7.

MCQ – 3

True about color blindness:

More common in male

More common in female

Age related

b and c

Explanation :

A i.e. More common in males


MCQ – 4

A person has defective blue colour apprec-iation. His condition is better named as

Deuteranomalous

Deuteranopia

`Tritanopia

Tritanomalous

Explanation :

D. i.e. Tritanomalous

Suffix \”anomalous\” is used for defective colour vision & Suffix \”anopia\” is for absent colour vision.

Term

Meaning                                      

Nyctalopia

Night blindness

Hamarlopia

Day blindness

Achromatopsia

Colour blindness

Trichromate

Individual with normal colour vision

Protanomalous

Defective red colour appreciation

Deuteranomalous

Defective green colour appreciation

Tritanomalous

Defective blue colour appreciation

Protanopia

Complete red colour blindness

Deuteranopia

Complete green colour blindness

Tritanopia

Complete blue colour blindness

  • So anopics have dichromatic colour vision i.e. (are able to see two primary colours) & anomalous have trichromatic colour vision with anomaly (i.e. mechanism to appreciate all 3 primary colours is present but is defective for one or two of them)
  • Protan means first, deutan means second, and tritan means third. According to decreasing wavelength it is used for red (550-570 nm, so protan), green (520-540 nm, so deuteran) and blue (410-424 nm, so tritan).

MCQ – 5

Protonopes have defect in identifying which colour

Red

Blue

Green

Black

Explanation :

A i.e. Red


MCQ – 6

Any spectral colour can be matched by a mixture of three monochromatic lights (red, green, blue) in different proportions. If a person needs more of one of the colour for matching than a normal person, then he has a colour anomaly. More red colour is needed in the case of :

Deuteranomaly

Tritanomaly

Protonomaly

Tritanomaly

Explanation :

C i.e. Protonomaly


MCQ – 7

Regarding color blindness true:

Mainly congenital

Can be testes with Fansworth 100 hue test

Isihara chart test red/green color blindness 

All

Explanation :

A i.e., Mainly congenital B i.e., Can be tested by Farnsworth 100 hue test; C i.e. Ishihara chart test red/ green colour blindness 

Tests for color vision

Pseudoisochromatic charts

–   Ishihara plates mainly to screen congenital protan & deuterans (i.e., red & green defects)Q

–   Hardy -Rand – Rittler plates is more sensitive to Ishihara since it can defect all three congenital defects

  • Edridge Green lantern test : the subject has to identify various colours shown to him (in lantern) & judgement depends on mistake he makes.
  • City university test : a spectroscopic test where subject is asked to match central colour to its closest hue from 4 peripheral surrounding colour in each of 10 plates.
  • Fansworth Munsell 100 hue test is the most sensitiveQ for both congenital & aquired colour defects. It
    consists of 85 hue caps (not 100) and vision is judged by error score i.e., higher score = poorer vision.
  • Fansworth D 15 hue discrimination test is similar test but utilizes only 15 hue caps
  • Nagel\’s anomaloscope (asked to mix red & green to make a given shade)
  • Holmgren\’s wool testQ

MCQ – 8

Congenital colour blindness is transmitted as:

Recessive disorder

Autosomal dominant

Sex-linked disorder

All of the above

Explanation :

Ans. Sex-linked disorder


MCQ – 9

Acquired blue blindness is a feature of:

Increased sclerosis of the crystalline lens

Disease of optic nerve

Disease of macula

All of the above

Explanation :

Ans. Increased sclerosis of the crystalline lens


MCQ – 10

Most common type of colour blindness is:

Protanopes

Deuteranopes

Tritanopes

None

Explanation :

Ans.B. Deuteranopes

Red-green color blindness is the most common type of color deficiency. Also known as deuteranopia, this is most likely a congenital condition.


MCQ – 11

A person has defective blue colour appreciation. His condition is better named as-

Deuteranomalous

Deuteranopia

Tritanopia

Tritanomalous

Explanation :

For defective (anomalous) colour vision, suffix anomalous is used; and for absent colour suffix anopia is used.

Colour

Defective

Absent

Green Deuteranomalous Deuteranopia
Red Protanomalous Protanopia
Blue Tritanomalous Tritanopia

 


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