the human eye
DESCRIPTION
the human eyeTRANSCRIPT
![Page 1: The human eye](https://reader038.vdocument.in/reader038/viewer/2022100603/559655cb1a28ab80768b47a9/html5/thumbnails/1.jpg)
EYEEYE
The eye is an extension of
the brain
Made by kush sehgalxi science r.no 29
![Page 2: The human eye](https://reader038.vdocument.in/reader038/viewer/2022100603/559655cb1a28ab80768b47a9/html5/thumbnails/2.jpg)
Eye brain Eye brain proxomityproxomity
This shows the optic
nerve bundle
Spinal cord
![Page 3: The human eye](https://reader038.vdocument.in/reader038/viewer/2022100603/559655cb1a28ab80768b47a9/html5/thumbnails/3.jpg)
Cross Cross sectionsection
The positions of
Retina
Lens
Cornea
Sclerotic
Optic nerve
Cilary muscles
Suspensory ligaments
![Page 4: The human eye](https://reader038.vdocument.in/reader038/viewer/2022100603/559655cb1a28ab80768b47a9/html5/thumbnails/4.jpg)
Retina – receives the imageRetina – receives the image
Full of light receptors which are sensitive to:
Colour Light levels
Massive blood supply is also needed
Fovea is the main focal point and has greatest density of light receptors
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Retina receptorsRetina receptors
Light receptors are called rods and cone
![Page 6: The human eye](https://reader038.vdocument.in/reader038/viewer/2022100603/559655cb1a28ab80768b47a9/html5/thumbnails/6.jpg)
Focusing Focusing on objectson objects
The lens and cornea focus the light on the retina
![Page 7: The human eye](https://reader038.vdocument.in/reader038/viewer/2022100603/559655cb1a28ab80768b47a9/html5/thumbnails/7.jpg)
FocusingFocusing The lens job is
to make the rays hit the same point
The red rays will be out of focus
![Page 8: The human eye](https://reader038.vdocument.in/reader038/viewer/2022100603/559655cb1a28ab80768b47a9/html5/thumbnails/8.jpg)
Near visionNear vision
to bend the light more to focus it
Fat lens needed
![Page 9: The human eye](https://reader038.vdocument.in/reader038/viewer/2022100603/559655cb1a28ab80768b47a9/html5/thumbnails/9.jpg)
Distance visionDistance vision
Rays enter the eye closer together
Need less bending
Thinner lens needed
![Page 10: The human eye](https://reader038.vdocument.in/reader038/viewer/2022100603/559655cb1a28ab80768b47a9/html5/thumbnails/10.jpg)
Changing lens thicknessChanging lens thickness The lens is slightly
elastic, its relaxed state is short and fat.
Cilary muscles are attached to the lens, when contracted they pull the lens thin
![Page 11: The human eye](https://reader038.vdocument.in/reader038/viewer/2022100603/559655cb1a28ab80768b47a9/html5/thumbnails/11.jpg)
Controlling Controlling light levelslight levels
Your eye are very sensitive and can be damaged by harsh light.
Your iris controls light allowed into the eye by changing the size of the pupil