Question

Describe RETINA & SCLERA of an human eye. [DETAILED ANSWER FOR 10 MARKS BUT IF COPIED, ANSWER WILL GET DELETED]

Answer 1

retina are millions of light sensitive cells, which come in two main varieties: rods and cones.

Rods are used for monochrome vision in poor light, while cones are used for color and for the detection of fine detail. Cones are packed into a part of the retina directly behind the retina called the fovea, which is responsible for sharp central vision.

When light strikes either the rods or the cones of the retina, it's converted into an electric signal that is relayed to the brain via the optic nerve. The brain then translates the electrical signals into the images a person sees, Fromer said.

The sclera, also known as the white of the eye, is the opaque, fibrous, protective, outer layer of the human eye containing mainly collagen and some elastic fiber.
1) In humans, the whole sclera is white, contrasting with the coloured iris, but in other mammals the visible part of the sclera matches the colour of the iris, so the white part does not normally show. In the development of the embryo, the sclera is derived from the neural crest.
2) In children, it is thinner and shows some of the underlying pigment, appearing slightly blue. In the elderly, fatty deposits on the sclera can make it appear slightly yellow. Many people with dark skin have naturally darkened sclerae, the result of melanin pigmentation.

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Answer 2

⭐⭐⭐⭐⭐ ANSWER ⭐⭐⭐⭐⭐

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⚡ RETINA - It is the innermost delicate membrane having a large number of photosensitive cells called 'rods' and 'cones'. The cones are sensitive to colour while the rods are sensitive to the intensity of light. However, the distribution of these cells is not uniform. The most sensitive region of retina id called yellow spot or fovea centralis.

⚡ SCLERA - It is the outermost protective covering of the eye. It is made of white tough fibrous tissues. It protects the vital internal parts of the eye. The sclera layer continues in front of the eye as cornea. This is a transparent white portion of the eye which covers the bulge of the surface of the eyeball. It allows the light to enter the eyeball. The cornea is protected by transparent conjunctiva.


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