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Structure of Retina - Practice Questions & MCQ
Edited By admin | Updated on Sep 18, 2023 18:34 AM | #NEET
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Structure of Retina is considered one of the most asked concept.
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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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