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Eye Anatomy of a Bald Eagle

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Chocolate Lovers

on 8 June 2015

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Transcript of Eye Anatomy of a Bald Eagle

Comparative Eye Anatomy of a Bald Eagle Project
Human Eye
Human Eye vs. Bald Eagle Eye
Works Cited
Similarities/Differences of Eye Structure
Both have cornea, iris, retina, pupil, lens, optic nerve and most basic structures.
By: Jianna George
Block 4

Structure of the Eye and Functions
Black circular opening inside of the iris which lets light in.
Colored part of the eye which grows and shrinks to control the amount of light that enters through the pupil.
Clear layer that covers the front of the eye. It focuses light as it enters the eye.
The white part of the eye that is tough and gives the eye its shape. It's also attached to the extra ocular muscles.
The thin clear layer of skin that covers the insides of the eyelid and the sclera. It keeps bacteria/dust/anything from getting to the back of the eye.

Bald Eagle Eye
The human eye is very intricate with it's many structures. Each structure in the eye has a different function.
In addition to this the cell structure of the human eye contains two different types of main structures.
Cell Structure Comparison
The Retina contains two different photoreceptors; rods and cones.
Rods are more sensitive than cones and therefore are usually used when there is low light to help you see better.
Cones are used to allow you to see colors.
Located at the back of the eye. It contains specialized cells, which help it convert light signals into nerve signals and then send them to the optic nerve. It basically sends signals to the brain which then are converted into images.
Clear, flexible structure located behind the pupil and iris which helps control/focus the amount of light as it goes through the eye to the retina.
Optic Nerve:
A bundle of nerves that transmit nerve signals to the brain.
Eye Structures and Functions (cont.)
Structures and Functions
- same as a human eye (controls amount of light that enters the pupil

Bald Eagles have an inner eyelid (nictitating membrane) which wipes dirt and dust from the cornea.

Our human eyes have millions of rods and cones; an eagle's eyes have tens or hundreds of millions.
Unique Characteristics Comparisons
Humans don't have an inner eyelid.
- same as human (clear layer that covers the front of the eye, focuses light as it enters eye) but can change the shape.
- same as human (focuses light as goes through eye to retina)
Sclera -
hidden under the eyelid (same functions as human eye)
Pecten -
thin folded tissue that goes from the retina to the lens. Supplies nutrients and vitamins through the vitreous humor of the eye which reduces the number of blood vessels in the retina. This means there is less blood vessels to scatter light that comes in it allows them to have an extremely sharp vision.
Structures and Functions
However the eagle has a pecten while human eyes don't have that. There are also slightly different functions for the cornea
Humans can only change our lenses to bring things into focus.

Bald Eagles can change their lenses and cornea which is why they have a better vision.
Optic Nerve -
same as human (A bundle of nerves that transmit nerve signals to the brain)
Similarities/Differences of Eye Structure
Haliaeetus leucocephalus
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