The flashcards below were created by user
scari
on FreezingBlue Flashcards.
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Wavelength
the distance between successive peaks or troughs
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Frequency
the number of waves per second
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Amplitude
Height difference between wave trough and peak
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Higher energy waves of light are what color?
Blue light waves are higher or lower energy?
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Red waves have a higher or lower energy?
Which color light wave has a lower energy?
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What is the spectrum humans can see?
400-700nm is the spectrum that ______ can see
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Pupil
The opening that allows light into the eye
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Iris
Pigmented (color) of eye, expands or contracts to make the pupil smaller or larger.
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When the pupil size is decreased what can be seen better (in good light)?
Distant objects come into better focus.
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If the pupil size is increased what happens to the depth of field?
The depth of field is decreased (you can see better up close).
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Your pupil size will be larger or smaller in bright light?
Smaller.
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How does bright light effect your depth of field (depth of focous)?
It will increase it.
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What is visual acuity limited by?
How does the number of photons hitting the retina effect your visual acuity?
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About how many degrees is the visual field for each eye?
150
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How does the wavelength of light relate to vision?
- Shorter wavelength=higher frequency
- Longer wavelenght=lower frequency
- Wavelength effects what we can and cannot see.
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Why can we see objects?
Because photons reflect off of them and hit our eyes (retina)
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Refraction is related to vision how?
Immages are formed in the eye due to the ______ of light.
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Fovea
center of color vision good for bright light
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Fat lens is for:
Near (keep the cookies close)
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Flat lens is for
Far (in the distance everything looks flat)
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accomodation is
changing the shape of the lens
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Layers of the retina
nerve fibers, ganglionic layer, inner plexiform layer, bipolar layer, outer plexiform layer, photoreceptor layer, pigmented cell layer, Choroid.
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Sensory retina:
photoreceptor, bipolar cell, ganglion cell
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Pigmented retina
single layer of pigmented cells
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Divergence
happens when light strikes a concave surface
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Convergence
Happens when light strikes a convex surface
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Focal point
point where light rays converge and cross (more spherical = more bent)
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Emmetropia
normal resting condition of the lens
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Convergence
Eyes both move toward the centerline
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Refraction in the eye is measured in
Diopters
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To be near sighted means that your eye is too long so you...
Can see close objects clearly but not distant
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Myopia is corrected by what kind of lens?
Concave, or radial kertotomy, or laser corneal sculpting
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In myopia where does the cornea and lens focus the object?
in front of the retina
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Hyperopia is also called what?
Farsightedness
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How is hyperopia corrected?
convex lenses
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Hyperopia's symptoms:
close objects are blurry but distance is okay
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Where is the immage focused with Hyperopia?
behind the retina
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Light turns the cell on or off?
OFF it was depolarized and firing till it got turned off.
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More light hitting a receptor would cause what?
more stopping of firing
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How many different kinds of opsins are present in cones?
three kinds of opsins green, red, and blue are present in what structure?
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How are bipolar cells classified?
Which cells are classified by the amount of glutamate released by photoreceptors?
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What is the source of output to the brain from the retina?
Ganglion cells are the source output to the brain from where?
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