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    4. Structure of Retina MCQ - Practice Questions with Answers

    Structure of Retina MCQ - Practice Questions with Answers

    Updated on Sep 18, 2023 18:34 AM

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    • Structure of Retina is considered one of the most asked concept.

    • 13 Questions around this concept.

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    The purplish-red pigment rhodopsin contained in the rods type of photoreceptor cells of the human eye, is a derivative of:

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    Structure of Retina
    • The inner layer of the eyeball is called the retina.
    • From outside to inside, it is made up of pigmented epithelium, photoreceptor cells, bipolar cells and ganglion cells
    • The photoreceptor cells are Rods and Cones
    • The photosensitive pigment of rods is called rhodopsin (a derivative of vitamin A) 
    • Rods enable night vision. Cones are responsible for colour vision and are of three types depending on the photopigments:
      • The erythropsin in the red-sensitive cones.
      • The chloropsin in the green-sensitive cones.
      • The cyanopsin in the blue-sensitive cones.
    • Cone cells contain pigment iodopsin
    • The optic nerve leaves the eye from a point called a blind spot or optic disc
    • The blood vessels also leave and enter via the blind spot.
    • There is no photoreception at the blind spot so it is not involved in vision.
    • At the posterior pole of the eye, a bit inferior-lateral to the blind spot, there is a yellowish spot called macula lutea with a central depression called fovea centralis.
    • The fovea is rich in cone cells and it is the point of maximum visual resolution.
    • The following diagram depicts the arrangement of various layers of cells in the retina:

     

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