Question

Describe the structure of humen eye
With its picture

Answer 1

Answer:

Structure of human eye

The internal structure of the eye includes retina, lens, aqueous humor, vitreous humor and optic nerve. ... A lens is a biconvex, transparent and adjustable structure that focuses light to the retina, hence forming images on it. Aqueous humor is a watery fluid that is present in the area between the lens and the cornea.

Answer 2

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Eye :

The eyes are a pair of sensory organs of

vision. These are located in the orbit of skull

with a cushion of fat around them. Each eye

is spherical/rounded and called eyeball. The

eyes are protected bones, eyebrows, upper and

lower eyelids with eyelashes and the lacrimal/

tear glands. Movement of the eyeball within

the orbit is controlled by 6 sets of muscles.

Wall of the eyeball is made up of 3 layers

(1) sclera, (2) choroid and (3) retina

1. Sclera/scelrotic :

It is the outermost layer made of dense fibroelastic connetive tissue with collagen fibres. It provides attachment to the eyeball muscles. The anterior thick, transparent part of sclera is cornea. It is slightly bulged out for focussing light on the retina. The sclera is provided with blood vessels, however the cornea is devoid of them. Cornea is nourished by aqueous humour and also by lacrimal secretion. The exposed part of sclera and the entire Cornea are covered by a transparent membranous covering called conjuctiva. It provides protection and lubrication to the cornea.

2. Choroid /Uvea :

It is the middle, vascular and pigmented layer. It is not a complete layer and can be divided into 3 regions -

a. Choroid proper b. Ciliary body c. Iris

a. The choroid proper :

It lines the sclera. Due to its pigmented nature it prevents internal reflection. The blood vessels of choroid provide nutrition and oxygen to the retina.

b. Ciliary body :

It is a thick, muscular

3. Retina :

It is the innermost, delicate, non

vascular light sensitive layer. It has 2 regions

(a) single layer of pigmented non sensory part

lining the iris and ciliary body

(b) sensory part

lining the choroid. It has an outer pigmented

part and an inner nervous part.

The inner nervous part is transparent and made of 3 layers

(1) outer photosensitive layer made of

rod and cone cells.

(2) middle layer of bipolar

nerve cells

(3) inner layer of ganglion cells. The

nerve fibres from the basal end of the ganglion

cells collectively form the optic nerve.

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