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Cornea ­ refracts light into the eye
Iris - controls amount of light entering
the eye
Optic Nerve- carries impulses from the
receptors to the brain
Blind spot ­ contains no light receptors
Retina- contains light receptors
Lens- focuses the light onto the retina…read more

Slide 3

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-Focusing on near and distant objects
Near Objects:
*Ciliary muscles contract, suspensory ligaments
slacken and lens becomes fat.
Distant objects:
*Ciliary muscles relax, suspensory ligaments tighten
and lens goes thin.…read more

Slide 4

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Correcting eyesight
Long sighted:
*Are unable to focus on near objects; the images are
focused behind the retina.
*Corrected by convex lenses.
Short Sighted:
*Are unable to focus on distant objects; the images
are focused in front of the retina.
*Corrected by concave lenses.…read more

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Binocular and monocular vision
*Binocular vision- two eyes which work together, humans
and some animals have this
- Good for judging distances
- Good for judging speed(handy for catching prey)
*Monocular Vision- one eye on each side of the head
- Wider field of view
- Can't easily judge depth or speed
- The organisms are more likely to notice predators…read more


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