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Vision

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by

kenzie dennis

on 24 February 2017

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Transcript of Vision

Vision:
Parts of the Eye:
Frequency of light and the visible spectrum:
Color Blindness:
Intensity:
the amount of energy in light waves ( determined by wave’s amplitude, or height)

Amplitude:
the height of light waves.

Brightness of light:
The brightness of light is related to intensity or the amount of light an object emits or reflects. Brightness depends on light wave amplitude, the height of light waves. Brightness is also somewhat influenced by wavelength. Yellow light tends to look brighter than reds or blues.

Video:
Wavelength
Red<Orange<Yellow<Green<Blue<Indigo<Violet
(In order of highest to lowest wavelength or lowest to highest frequency)

R - 650 nm
O - 590 nm
Y - 570 nm
G - 510 nm
B - 475 nm
I - 445 nm
V - 400 nm


Pictures
By: Aaliyah, TC, Eduardo, Kenzie, Dhivya, Josh, Nimra
Cornea
: the transparent layer forming the front of the eye that refracts, bends the light and is responsible for the light the enters the eye

Lens
: located behind the pupil and iris, the lens help focus light that enters the eye in order to create clear images of objects positioned at different distances

Accommodation
: process by which the eye’s lens changes shape to focus near or far objects on the retina
Rod
: light sensitive cell located in the retina responsible for monochrome vision in poor light and side vision

Cones
: specialized light sensitive cell(photoreceptor) in the retina that provides color vision and sharp central vision

Difference between rods and cones:
Rods are responsible for side vision while cones are responsible for central vision. Rods are responsible for monochrome vision and the cones provide color vision Rod: light sensitive cell located in the retina responsible for monochrome vision in poor light and side vision



Iris
: Muscle that contracts and expands the pupil according to the amount of light present in the environment. It is what gives the eye it's color.

Pupil
: It is a hole in the center of the eye that helps light hit the retina. This allows the retina to process light information. The size of the pupil is controlled by the iris.

Retina
: A layer of receptors that are sensitive to light. Located at the back of the eye, the retina triggers nerve impulses. These nerve impulses Travel to the optic nerve then to brain, where the image is processed.

Fovea
: A small “pit” or depression at the center of the eye comprised of tightly packed cones. It is responsible for controlling sharp central vision and some actives that depend on this include driving and reading .

Macula
: A pigmented oval shaped area that surrounds the Fovea. It is responsible for for keensight vision.
Transduction
: when the eyes transform the energy into neural messages that the brain processes into what you consciously see.
Color Blindness
- a variety of disorders leading to the inability to see some colors. The mutation is found in the X chromosome that is why more male are color blind than females because males only have X chromosome. This increases the probability of them having it because they don't have a dominant X non colorblind gene to “cancel” it out.

Monochromacy-
Complete color blindness where everything you see is in different shades of gray making day to day tasks extremely difficult. Monochromacy can include 4 types
Rod Monochromacy
Blue- Cone Monochromacy
Cone monochromacy
Cerebral Achromatopsia



Dichromacy-
two types of cones which are able to perceive color; blues and yellows stand out and have trouble differentiating between pale shades of colors.

Anomalous trichromacy-
In people with this condition all of their three cone types are used to perceive light colours but one type of cone perceives light slightly out of alignment,



Color Vision:
Color vision
- ability to distinguish objects based on wavelengths

Trichromatic theory-
One receptor is sensitive to the color green, another to the color blue and a third to the color red. Aka young- helmholtz theory.

Opponent-process theory-
developed by Ewald Hering cone photoreceptors are linked to to form opposing color pairs- blue yellow, black white, and red green.

Afterimages
- being able to see an image after you have stopped staring at it.

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