what is human eye ? define all parts of eyes ??
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the human eye is of the most valuable sense organs that enables us to see the whole world around us.
- Sclera : is a tough outercoat that protects the entire eyeball.
- Choroid : it is a thick white transparent wall.. a vascular layer of the eye which contains blood vessels that nourish the inner parts of the eye. it protects the eye from foreign particles entering into it.
- Cornea : is the front portion of the eye. convex in shapeand bulges outside. light enters the eye through cornea..
- Iris : is a dark muscular diaphragm located just behind the cornea...it regulates the amount of light entering the eye by adjusting the size of pupil.
- Pupil : is a hole i the middle of the iris. its size decreases or increases depending upon the density of light entering the eye....
- Eye lens : is made up of a transparent jelly like substance which is made up of proteins. it is held in position by ciliary muscles and suspensory ligaments
- Ciliary muscles and suspensory ligaments : adjust the focal length of the eye so that we can see distant and nearby objects clearly.
- Aqueous humor : is a viscous liquid filled in the area bw the cornea and eyelens. it prevents the eye from collapsing due to changes in the atmospheric pressure...
- Retina : is a delicated membrane havig a large no. of light sensitive cells they get activated upon illumination and generate electric signals..they are of two types : (i) Rods and (ii) Cones
- Rods : cells that respond to intensity of light
- Cones : cells that respond to colour of objects..
- Macula : is a tiny area which is responsible for clear and sharp vision..there's a small depression inside the macula that is called FOVEA CENTRALIS, here max no of cones are present
- Vitreous Humor : its a jelly like substance filled in the space bw retina and eye lens....it helps in maintaining the shape of the eye...it is a small region in retina where the optic nerve enters the eye.....it is sensitive to light ...hence called the BLIND SPOT
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the human eye is of the most valuable sense organs that enables us to see the whole world around us.
Sclera : is a tough outercoat that protects the entire eyeball.
Choroid : it is a thick white transparent wall.. a vascular layer of the eye which contains blood vessels that nourish the inner parts of the eye. it protects the eye from foreign particles entering into it.
Cornea : is the front portion of the eye. convex in shapeand bulges outside. light enters the eye through cornea..
Iris : is a dark muscular diaphragm located just behind the cornea...it regulates the amount of light entering the eye by adjusting the size of pupil.
Pupil : is a hole i the middle of the iris. its size decreases or increases depending upon the density of light entering the eye....
Eye lens : is made up of a transparent jelly like substance which is made up of proteins. it is held in position by ciliary muscles and suspensory ligaments
Ciliary muscles and suspensory ligaments : adjust the focal length of the eye so that we can see distant and nearby objects clearly.
Aqueous humor : is a viscous liquid filled in the area bw the cornea and eyelens. it prevents the eye from collapsing due to changes in the atmospheric pressure...
Retina : is a delicated membrane havig a large no. of light sensitive cells they get activated upon illumination and generate electric signals..they are of two types : (i) Rods and (ii) Cones
Rods : cells that respond to intensity of light
Cones : cells that respond to colour of objects..
Macula : is a tiny area which is responsible for clear and sharp vision..there's a small depression inside the macula that is called FOVEA CENTRALIS, here max no of cones are present
Vitreous Humor : its a jelly like substance filled in the space bw retina and eye lens....it helps in maintaining the shape of the eye...it is a small region in retina where the optic nerve enters the eye.....it is sensitive to light ...hence called the BLIND SPOT