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Anatomy Eye Report

Our eyes refract, or bend, light in a similar way as camera lenses. Light enters the eye and is refracted by the cornea and lens to focus on the retina. This allows for electrochemical impulses to be sent along the optic nerve to the brain for interpretation and sight. Refraction can cause nearsightedness or farsightedness if the light is focused in front of or behind the retina, respectively, resulting in blurry vision corrected by diverging or converging lenses.

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brylle
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59 views1 page

Anatomy Eye Report

Our eyes refract, or bend, light in a similar way as camera lenses. Light enters the eye and is refracted by the cornea and lens to focus on the retina. This allows for electrochemical impulses to be sent along the optic nerve to the brain for interpretation and sight. Refraction can cause nearsightedness or farsightedness if the light is focused in front of or behind the retina, respectively, resulting in blurry vision corrected by diverging or converging lenses.

Uploaded by

brylle
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Download as DOCX, PDF, TXT or read online on Scribd
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good morning everyone I am Brylle Reann Lim and I will discuss how refraction occurs in our

eyes.

So first lets understand how Refraction work in our eyes?

Our eyes are similar to a lens in a camera, when it sends a message to produce a film, the lens
in the eye 'refracts' or bends incoming light onto the retina.

Our ability to “see” starts when light reflects off an object at which we are looking and enters
the eye. As it enters the eye, the light is unfocused. The first step in seeing is to focus the light
rays onto the retina, which is the light sensitive layer found inside the eye. Once the light is
focused, it stimulates cells to send millions of electrochemical impulses along the optic nerve to
the brain. The portion of the brain at the back of the head interprets the impulses, enabling us
to see the object.

When light passes from the air into your eyes the light is refracted, or bent. This bending begins
at the cornea and continues through the rest of the eye, because these structures are denser
than air. In a normal eye looking at distant images, the ciliary muscle is relaxed, the lens is flat,
and the light from that object is bent to focus a clear image on the retina's surface.

Another name for normal vision is emmetropia. But not everybody has normal vision. People
with nearsightedness or myopia can see nearby objects clearly but distant objects are blurry.
The nearsighted eye is too long and shaped a bit like a football. So in viewing distant objects
light is bent, but focuses too soon at a point in front of the retina. When the light reaches the
retina it is out of focus, so the image is blurry.

Nearsightedness is corrected with a diverging lens that refracts the light to focus it correctly on
the retina. People with farsightedness, or hyperopia, can see distant objects clearly, but have
difficulty seeing things nearby. Hyperopia results from an eye that is too shallow. Light focuses
on a point behind the eye. So again, the light striking the retina is not focused, and the images
blurry. A converging lens can correct for farsightedness. It's very common that as people age
and the lens loses elasticity, near objects become blurry. This form of hyperopia, called
presbyopia, is why many adults require reading glasses.

now let me pass the spotlight to Nicole lao where she will discuss to us how the neural visual
pathway works.

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