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Human Eye, Camera and Squid Eye Comparison

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by

Renée Michaud

on 27 March 2017

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Transcript of Human Eye, Camera and Squid Eye Comparison

Squid Eye
Squid eyes are similar to human eyes except for small differences. Their vision helps them survive in their specific environment because they have larger eyes and no blind spot to help them see at all times, and they can see in the dark. These aspects meet the needs of a squid because they can see predators approaching easily, can find food, and can do all of this in the deep parts of the ocean they live in.
Human Eye and Squid Eye Comparisons
Comparison Diagrams
Camera
Shutter- Opens to take a picture
Film- Catches the image
Protective Glass- Lens cover protects the lens
Diaphragm- Stops light from getting in except for in the aperture
Automatic Brightness Adjustment- Opens and closes the diaphragm according to the brightness of the subject
Lens- Lets light into the camera to focus it
Focusing Ring- Allows for the camera to focus at different levels
Aperture- Hole through which light enters the camera
Human Eye and Camera Comparisons
- Vitreous humor
- Aqueous humor
- Optic nerve
- When light is low eyes don't sense color as easily
- What you see generates from the brain
- Eyes can't take in detail of something moving too fast
- Human eye has more pixels than a camera
Human Eye
Cornea- Thick-celled clear covering over eye
Pupil- Expands and contracts to let more or less light into the eye
Retina- Receives light focused from lens, contains photoreceptors, blind spot in back of eye
Iris- Colored part of eye, muscles inside control pupil dilation
Iris Reflex- Opens and closes iris according to the brightness of the subject
Lens- Focuses the image on the retina
Ciliary Muscle- Pulls and releases on the lens to make it thinner or thicker
Optic Nerve- Transmits signals from light receptors in the retina to the brain
Aqueous Humor- Fluid between the iris and the cornea; keeps the eyeball rigid and refracts light
Vitreous Humor- Fills out shape of eyeball, transparent/jellylike fluid, contains blood vessels and is the chamber behind the lens
Human, Camera and Squid Eye Comparison
Human Eye to Camera:
Eye
Camera
Same
Cornea-Protective glass
Retina-Film
Pupil-Shutter/aperture
Iris-Diaphragm
Iris reflex-Automatic brightness adjustment
Lens-Lens
Ciliary muscle-Focusing ring
- Flash
- Mode switch
- Power
- Camera censors always have same sensitivity to light
- Can function in high speed; freeze motion
How the Human Eye Sees
How Cameras See
Larger eyes
Cannot see in color (no cones)
Camouflage all around lens
No blind spot
Photoreceptors face towards light
Eyes derived from skin
Squid Eye
Same
Human Eye
Have cones
Photoreceptors face away from light
Eyes are outgrowths of the brain
Blind spot in back of eye
Lens
Optic nerve

In a camera, the aperture opens up at the front of the camera an the light goes in through the lens.
In the human eye, light enters through the cornea and then passes through the lens. The iris controls the amount of light let into the eye through the pupil, and the pupil is what lets light into the eye. The image is then "recorded" in the retina. Once the retina receives the image, it's then transformed into electrical impulses that are carried to the brain by the optic nerve.
Human Eye to Squid Eye:
Works Cited
https://cephalopods2014.wordpress.com/anatomy/

https://gillylab.stanford.edu/neuroscience.html

http://www.d.umn.edu/~olse0176/Evolution/octo.html

https://answers.yahoo.com/question/index?qid=20100416163822AAd4weZ

http://www.iflscience.com/plants-and-animals/squid-and-humans-evolved-same-eye/

http://scienceblogs.com/pharyngula/2008/05/15/the-subtly-different-squid-eye/

http://animals.mom.me/squids-eye-survive-its-environment-8618.html
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