EYE AS OPTICAL INSTRUMENT
As an optical instrument the eye be compared with a camera as below
1.Eye lids act shutter of the camera.
2.Cornea and crystalline lens act as focusing system of the camera.
3. Iris acts as diaphragm which regulates size of the entering the eye.
4. Choroid helps in forming the darkened interior of the camera.
5. Retina acts as light-sensitive plate or film on which image is formed.
To be more precise,the functioning of the eye can be considered to be analogous to a closed circuit colour TV system as depicted in (Fig).
The optic nerve and its connection convey the details of the image to the occipital region of the cerebral cortex,where they are processed before reaching consciousness.
As an optical instrument the eye be compared with a camera as below
1.Eye lids act shutter of the camera.
2.Cornea and crystalline lens act as focusing system of the camera.
3. Iris acts as diaphragm which regulates size of the entering the eye.
4. Choroid helps in forming the darkened interior of the camera.
5. Retina acts as light-sensitive plate or film on which image is formed.
To be more precise,the functioning of the eye can be considered to be analogous to a closed circuit colour TV system as depicted in (Fig).
The optic nerve and its connection convey the details of the image to the occipital region of the cerebral cortex,where they are processed before reaching consciousness.
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