3.1.4 identifies abnormal colour vision and appreciates its significance

Question 1

Why might you assess a patient’s colour vision?

Answer 1

1. Career is such as police, armed forces, pilots, electrical engineers do need a good sense of colour vision to be able to do their job effectively
2. Educational purposes, such as primary school, colour-coded teaching, chemistry, history, geography,

3.For safety reasons, such as traffic lights, electrical wiring Next paragraph

4. Pathology reasons for example, changes in colour vision would be a sign of potential pathology.

Question 2

Explain a congenital colour vision deficiency

Answer 2

Congenital vision deficiency is linked to the X chromosome. It occurs in one and every 12 males and one in every 250 females.

Usually the mom carries the defective gene, but she usually has normal colour vision. The most common type of congenital colour vision deficiency is dueteranomaly which is in about 5% of all men. All first time males should have a vision assessment as part of their eye examination.

Question 3

What are the three types of colour vision deficiencies?

Answer 3

Trichromacy, dichromacy, monochromacy

Question 4

Explain and further classify trichromacy

Answer 4

Trichromic is when all cones and pigments are present and functioning.

They are further classified as
Protanomaly: abnormal long wavelength pigment

Duetranomaly: abnormal medium wavelength pigment

Tritanomaly: abnormal short wavelength pigment