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Mahek Arora from DELHI PUBLIC SCHOOL, asked a question
Subject: Science , asked on 1/10/14

parts of human eye and its functions

Vartika From Notre Dame Academy, added an answer, on 26/2/11
731 helpful votes in Science

Parts of Human Eye & Their Functions:

The human eye is a ball about 2.5 cm in diameter. It consists of the following parts:

1) Sclerotic: Sclerotic is the outer coating of the eye which is white in colour, that protects the interior of the eye and provides the shape to the eye.

2) Cornea: The front part of sclerotic is transparent to light and is termed as cornea. The light coming from an object enters the eye through cornea.

3) Iris: Iris is just at the back of cornea. This controls the size of the pupil. It acts like a shutter of a photographic camer and allows the regulated amount of light to enter the eye.

4) Eye Lens: Eye lens is a double convex lens with the help of which image is formed at retina by refraction of light.

5) Ciliary Muscles: The eye lens is held by ciliary muscles. Ciliary muscles help the eye lens to change its focal length.

6) Pupil: At the centre of the iris there is a hole through which light falls on the lens, which is called pupil.

7) Aqueous humour : The space between cornea and eye lens is filled with a transparent fluid called aqueous humour.

8) Vitreous Humour: The space between eye lens and retina is filled with a jelly like transparent fluid called vitreous humour.Eye Image

9) Retins : Retina serves the purpose of a screen in the eye, wherethe images of the objects are formed. Retina is at the back of the eye lens. Retins is made of light sensitive cells, which are connected to the optical nerve.

10) Optic Nerve: Optic nerve carries the information to brain.

11) Principal Axis

12) Blind Spot : The region of eye containing the optic nerve is not at all sensitive to light and is called blind spot. If the image of an object is formed in the blind spot, it is not visible.

13) Yellow Spot : The central part of retina lying on the optic axis of eye is most sensitive to light and is called yellow spot.

14) Eye Lids: Eye lids are provided to control the amount of light falling on the eye. They also protect the eye from dust particles etc.

Hope it will be helpful... :)

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Rudraksh Dixit From Vindhyachal Academy, added an answer, on 1/10/14
102 helpful votes in Science

The given figure shows the structure of the human eye.

The human eye is roughly spherical in shape with diameter of about 2.3 cm. It consists of a convex lens made up of living tissues. Hence, human lenses are living organs contrary to the simple optical lenses.

Thewhite of the eyeis known as thesclera. It is the tough, opaque tissue that protects the outer layer of the eye.Irisis the coloured part of the eye, and thepupilis the black,

The following table lists the main parts of the human eye and their respective functions.

S. No.

Human eye part

Function

1.

Pupil

Opens and closes in order to regulate and control the amount of light

2.

Iris

Controls light level similar to the aperture of a camera

3.

Sclera

Protective outer coat

4.

Cornea

Thin membrane which provides 67% of the eyes focusing power

5.

Crystalline lens

Helps to focus light into the retina

6.

Conjunctiva

Covers the outer surface (visible part) of the eye

7.

Aqueous humour

Provides power to the cornea

8.

Vitreous humour

Provides the eye its form and shape

9.

Retina

Captures the light rays focussed by the lens and sends impulses to the brain via optic nerve

10.

Optic nerve

Transmits electrical signals to the brain

11.

Ciliary muscles

Contracts and extends in order to change the lens shape for focusing.

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Arpitha From Kendriya Vidyalaya, added an answer, on 28/2/15
8 helpful votes in Science
thanks for giving the answer.......
 
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Arpitha From Kendriya Vidyalaya, added an answer, on 2/3/15
8 helpful votes in Science
thanx//,,,,
 
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Upasana Das From Kendriya Vidyalaya, added an answer, 2 weeks, 2 days ago
88 helpful votes in Science
thanks 4 d answers
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Esther From Kendriya Vidyalaya, added an answer, 2 weeks, 5 days ago
7 unhelpful votes in Science
The parts of the  human eye and functions are :
1.Corne
2.Pupil
3.Iris
4.Blind spot
5.Optic nerve
6.Yellow spot
7.Eye lens
 
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Jigyasa Singh From Zee High Sch, added an answer, 1 day, 17 hours ago
1 helpful votes in Science
Refer S.Chand for the Answer
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Cm And Swathi .m From Sri Chaitanya Techno School, added an answer, 22 hours, 32 minutes ago
1 helpful votes in Science
1)PUPIL:IT REGULATES AND CONTROLS THE AMOUNT OF LIGHT ENTERING THE EYE.
2)CORNEA:IT IS A TRANSPARENT PROTECTIVE LAYER IN THE HUMAN EYE.
3)IRIS: IT IS A DARK MUSCULAR DIAPHRAGM THAT CONTROLS THE SIZE OF PUPIL.
4)CILIARY MUSCLES: THESE CAN PROVIDE THE FINER ADJUSTMENT OF FOCAL LENGTH
5)CRYSTALLINE LENS : IT PROVIDES THE FINER ADJUSTMENT OF FOCAL LENGTH
6)RETINA : IT IS A LIGHT SENSITIVE SCREEN OF THE EYE ON WHICH REAL IMAGE AND INVERTEDOF THE OBJECT IS FORMED.
7)RODS: IT HELPS TO DETECT THE INTENSITY OF LIGHT.
8)CONES:CONES HELP US TO IDENTIFY THE COLOUR
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Trinton Stewart , added an answer, on 30/10/14
1 helpful votes in Science

google exist lol

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Faheem From The Indian School, added an answer, 2 days ago
1 helpful votes in Science
thank u for the answers, i had the same question
 
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Venkat Sai Ram From Triveni Talent School, added an answer, on 11/12/16
40 helpful votes in Science
Yes
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Taimoor Faheem , added an answer, on 4/2/15
2 unhelpful votes in Science
it is so simple. I L y
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Maha Lakashmi From Delhi Public School, added an answer, 4 weeks ago
15 helpful votes in Science
thank you it is very helpful for my exams
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Akshal Jain , added an answer, on 18/8/14
2 unhelpful votes in Science

I don't know

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Waymae Lynn Ayson , added an answer, on 26/6/14
2 unhelpful votes in Science

what is the function of extraocular muscle?

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G.shashirekha , added an answer, on 2/1/14
3 unhelpful votes in Science

how do the lutein and corotenoids help eye protection

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