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The Human Eye. Comparing human eye to camera Hyperopia , Presbyopia & Myopia. Components of the Eye. Pupil. Iris. Iris. Pupil. Components of the Eye. Iris. Pupil. Cornea. Lens. Components of the Eye. Retina. Iris. Pupil. Cornea. Lens. Components of the Eye. Retina. Iris.

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the human eye

The Human Eye

Comparing human eye to camera

Hyperopia, Presbyopia & Myopia

components of the eye
Components of the Eye

Pupil

Iris

Iris

Pupil

components of the eye1
Components of the Eye

Iris

Pupil

Cornea

Lens

components of the eye2
Components of the Eye

Retina

Iris

Pupil

Cornea

Lens

components of the eye3
Components of the Eye

Retina

Iris

Optic Nerve

Pupil

Cornea

Lens

components of the eye4
Components of the Eye

Image formed on retina will be smaller & inverted.

You “see” with your brain

Your brain will “flip” the image

eye accommodation
Eye Accommodation

Ciliary muscles can change the shape of the lens slightly to accommodate focusing on distant & nearby objects.

hyperopia far sightedness
Hyperopia(Far-sightedness)

Problem focusing on nearby objects. Due to either:

  • Distance between lens & retina are too small
  • Focusing power of cornea-lens combination is too weak  light is focused behind the retina

Solution: Corrective converging lens

(or positive meniscus)

presbyopia
Presbyopia

Also problem on seeing nearby objects.

HOWEVER, this is due to aging  because lens lose their elasticity.

Solution: Corrective converging lens.

myopia near sightedness
Myopia (Near-sightedness)

Problem focusing on distant objects. Due to either:

  • Distance between lens & retina are too large
  • Focusing power of cornea-lens combination is too strong  light is focused in front of retina

Solution: Corrective diverging lens

(or negative meniscus)