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Power of Accommodation- Human Eye
 

Power of Accommodation- Human Eye

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Power of Accommodation

Power of Accommodation
Human Eye & The Colourful World

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    Power of Accommodation- Human Eye Power of Accommodation- Human Eye Presentation Transcript

    • Power of Accommodation Presented by,
    • Modify the curvature to some extent Composed of a fibrous, jelly-like material Lens Ciliary muscles
    • Ciliary muscles Modify the curvature to some extent Change in curvature Change its focal length
    • Distant vision Ciliary muscles are relaxed Ciliary muscles are relaxed Lens becomes thin Focal length increases Enables us to see distant objects clearly
    • Close vision
    • What is accommodation? The ability of the eye lens to adjust its focal length is called accommodation
    • However, the focal length of the eye lens cannot be decreased below a certain minimum limit. Near point of the eye Far point of the eye The minimum distance, at which objects can be seen most distinctly without strain, is called the least distance of distinct vision. It is also called the near point of the eye. The farthest point upto which the eye can see objects clearly is called the far point of the eye. For a young adult with normal vision, the near point is about 25 cm. It is infinity for a normal eye. Therefore, a normal eye can see objects clearly that are between 25 cm and infinity.
    • Cataract The crystalline lens becomes milky and cloudy (at old age). This condition is called cataract. This causes partial or complete loss of vision. It is possible to restore vision through a cataract surgery.
    • Why do we have two eyes for vision and not just one?
    • Why do we have two eyes for vision and not just one? It gives a wider field of view. A human being has a horizontal field of view of about 150° with one eye and of about 180° with two eyes. The ability to detect faint objects is, of course, enhanced with two detectors instead of one. Some animals, usually prey animals, have their two eyes positioned on opposite sides of their heads to give the widest possible field of view.
    • Stereopsis is the impression of depth that is perceived when a scene is viewed with both eyes
    • Thank you 