advertisement

Amazing Human Eye

67 %
33 %
advertisement
Information about Amazing Human Eye
Education

Published on March 5, 2014

Author: 7activestudio

Source: slideshare.net

Description

The human eye: is the most valuable and sensitive sense organ and it is a natural optical instrument. The important parts of the eye: Cornea, Iris, Pupil, Eye Lens, Retina.
Power of Accommodation: The ability of the eye to focus objects lying at different distances is called the power of accommodation of the eye.
Least Distance of Distinct Vision Near point: Near point or least distance of distinct vision is the point nearest to the eye at which an object is visible distinctly
The far point of the eye:
Far point of the eye is the maximum distance up to which the normal eye can see things clearly. It is infinity for a normal eye.
The twinkling of a star is due to atmospheric refraction of starlight.
Scattering of light:
When a beam of light falls on an atom, it causes the electron in the atom to vibrate. The vibrating electrons, in turn, re-emit light in all directions. This process is called scattering.

7 Active Technology Solutions Pvt.Ltd. is an educational 3D digital content provider for
K-12. We also customize the content as per your requirement for companies platform providers colleges etc . 7 Active driving force "The Joy of Happy Learning" -- is what makes difference from other digital content providers. We consider Student needs, Lecturer needs and College needs in designing the 3D & 2D Animated Video Lectures. We are carrying a huge 3D Digital Library ready to use.

For more information:

http://www.7active.in

Contact: 040-64501777 / 65864777
9700061777
advertisement

Learning Objectives The Human Eye The Important Parts of The Eye Power of Accommodation Defects of vision and their correction Myopia or Near-sightedness, Hypermetropia or Farsightedness Presbyopia

The Important Parts of The Eye Cornea Cornea: The front part of the eye is covered by transparent spherical membrane called cornea.

The Important Parts of The Eye Cornea Iris Iris: Just behind the cornea is a dark coloured muscular diaphragm which has a small circular opening in the middle.

The Important Parts of The Eye Cornea Pupil Iris Pupil: Pupil is the small circular opening of iris. The pupil appears black because no light is reflected from it.

The Important Parts of The Eye Cornea Pupil Iris Eye Lens Eye Lens: The eye lens is a convex lens made of a transparent jelly like proteinaceous material.

The Important Parts of The Eye Ciliary muscles Cornea Pupil Iris Eye Lens Ciliary muscles: The eye lens is held in position by ciliary muscles. The ciliary muscles help in changing the curvature and focal length of the eye lens.

The Important Parts of The Eye Ciliary muscles Cornea Pupil Iris Eye Lens Retina Retina: The inner back surface of the eye ball is called retina. It is a semi-transparent membrane which is light sensitive and is equivalent to the screen of a camera.

The Important Parts of The Eye Ciliary muscles Vitreous humour Cornea Pupil Iris Eye Lens Retina Vitreous humour: The space between the retina and eye lens is filled with another fluid called vitreous humour.

The Important Parts of The Eye Ciliary muscles Vitreous humour Cornea Blind spot Pupil Optic Nerve Iris Eye Lens Retina Blind Spot: It is a spot at which the optic nerve enters the eye and is insensitive to light and hence the name.

Power of Accommodation Near object Far object Power of Accommodation: The ability of the eye to focus objects lying at different distances is called the power of accommodation of the eye.

Power of Accommodation Ciliary muscles Thin Eye Lens Thick Eye Lens When the ciliary muscles are relaxed, the eye lens becomes thin. Thus, its focal length increases and we see the distant objects clearly. When the ciliary muscles are contract, then the curvature of the eye lens is increases and the eye lens becomes thick. Thus, its focal length decreases and we see the nearby objects.

Power of Accommodation Near Point of the Eye Far Point of The Eye 25 cm Near point or least distance of distinct vision is the point nearest to the eye at which an object is visible distinctly. Far point of the eye is the maximum distance up to which the normal eye can see things clearly. It is infinity for a normal eye.

Defects of Vision and Their Correction

Myopia or Near-sightedness Myopic Eye Correction Concave Lens Myopia :The light from a distant object arriving at the eye lens may get converged at a point in front of the retina in the vitreous body. Correction for myopia: To compensate this, we interpose a concave lens between the eye and the object, with the diverging effect desired to get the image focused on the retina.

Hypermetropia or Farsightedness Hypermetropic Eye Hypermetropia: If the eye-lens focuses the incoming light at a point behind the retina, this defect is called far sightedness or hypermetropia. Correction Convex Lens Correction for hypermetropic eye: A convergent lens(convex lens) is needed to compensate for the defect in vision.

Presbyopia Presbyopia is a common type of vision disorder that occurs as you age. It is often referred to as the aging eye condition. Presbyopia results in the inability to focus up close, a problem associated with refraction in the eye.

Cataract Milky and Cloudy Eye Cataract: The crystalline lens of people at old age becomes milky and cloudy. This condition is called cataract. This causes partial or complete loss of vision. It is possible to restore vision through a cataract surgery.

THANK YOU

Add a comment

Related presentations

Related pages

20 Facts About the Amazing Eye - Discovery Eye Blog

11 thoughts on “ 20 Facts About the Amazing Eye ” Francisco Espino June 25, 2014. ... – The human eye can distinguish about 10 million different colors.
Read more

The human eye is a marvellous design – Glory be to God

The human eye is a marvellous design. Glory be to God not random chance. ... As you read about the amazing complexity of the eye please ask yourself: ...
Read more

The Incredible Human Eye - Amazing Incredible!

The Incredible Human Eye. Dec 23 '07 4262 photography, art. The iris, the most visible part of the vertebrate eye, is composed of pigmented bundles of ...
Read more

How the Human Eye Sees - WebMD - Better information ...

The human eye is an amazing organ. WebMD explains how it works.
Read more

Interesting Facts About The Human Eye

A selection of ten interesting facts about The Human Eye. TEN FACTS. Thousands of interesting facts and other bits of fun trivia Show navigation Hide ...
Read more

14 Unbelievable Facts About The Human Eye - BuzzFeed

14 Unbelievable Facts About The Human Eye. My EYES. H/t this fascinating Quora thread. Robyn Wilder. BuzzFeed Staff, UK. 1. Your retinas ...
Read more

115 Amazing Human Eyes - YouTube

115 Amazing Human Eyes SxmsCelik. Subscribe Subscribed Unsubscribe 36,122 36K. Loading... Loading... ... Physics Human Eye part 1 (Eye ...
Read more

Amazing facts of human eye video - YouTube

Do you know all facts about eyes? to learn amazing facts about human eye watch this video.
Read more

Amazing Photos of Human Eyes - Design Ideas and Tech ...

Incredible photo series by Suren Manvelyan features extremely detailed close-ups of human eyes. “Every day we see hundreds of eyes but do not ...
Read more