Color Blindness

Color Blindness

Question 1. Visual pathway.
Answer:

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Question 2. Colour blindness.
Answer:

Definition:

• Inability to distinguish colour is called colour blindness.
• It is more common in males than in females.

Causes:

1. Herediatary

2. Acquired conditions.

• Trauma
• Chronic diseases
• Drugs like barbiturates
• Toxins like carbon monoxide.
• Alcoholism.
• Aging.

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Classification:

• Based on Young-Helmholtz trichromatic theory, colour blindness is classified into.

1. Monochromatism.

• In this condition, the person cannot appreciate any of the primary colour.

2. Dichromatism.

• In it, the subject can appreciate only two primary colours.

3. Trichromatism.

• Subject are able to perceive all the three colours but the intensity of one of the primary colors cannot be appreciated correctly.

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Question 3. Organ of corti.
Answer:

• It is the located on the basilar membrane extending from the apex to the base of the cochlea.

Cells of it:

• It consists of
  1. Border cells.
  2. Inner hair cells.
  3. Inner phalangeal cells.
  4. Inner pillar cells.
  5. Outer piller cells.
  6. Outer phalangeal cells.
  7. Outer hair cells
  8. Cells of Hensen.
  9. Cell of Claudius
  10. Tectorial membrane and lamina reticularis.