問題一覧
1
What the function/ definition of vision
detects color and intensity of light. eyes focus on an object and the brain process it
2
How many layers does the eyes
3
3
Which are a layers of the eye
fibrous layer, vascular layer , inner layer
4
Lens
directly behind the pupil, the curve of the lens helps us focus on near or far objects
5
The structure that can contract or dilate to allow more or less light to enter the eye is the
iris
6
Choroid
black layer that contains melanin and helps prevent the scattering of incoming light
7
Parts of (fibrous layer of the eye)
sclera, cornea
8
Light enters the eyes through the——— then is——— Bent, So that it can be focused on———. on its way to the retina, It passes through the———, the ——— the ———,the———, and the ———. The——— and ——— of the innermost layer are the ———.they respond So the light and form a nerve impulse that leaves the eye through the———and then goes to the ———. when in the brain the impulse traveled through the ——— of the ——— Where Visual interpretation occurs, Known as “seeing”.
pulpil, refreacted, retina, cornea, aqueous humor , lens, victreous humor, rods, cones, photoreceptor cells, optic nerve, brain, occipital lobe, cerebrum
9
Parts of the (vascular layer of the eye)
choroid, ciliary muscle , iris, lens
10
Fibrous layer
has tough fibrous tissue
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Vascular layer
has a dense network of blood vessels
12
Parts of the (inner layer of the eye)
retina, optic nerve , retinal blood vessels
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Ciliary muscle
holes the lens in place when we look at distant objects
14
Ciliary muscle (how it works when viewing an object in the distance?)
it relaxed and the lens is slightly curved
15
Ciliary muscle (how it works when viewing an object that near?)
is contracted and the causes the lens to curve more
16
Conjuctiva
mucous membrane that lines the fibrous layer
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Ciliary body
secretion of vitreous fluid,changes shape of the lens
18
Rods
detect night vision,dim light and color
19
Rods are located
in the central portion of the retina called fouea central
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The central portion of of the retina is called
fovea centralis
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Cones
detect bright light
22
Cones are located
they are scattered throughout the central portion of the retina called the fovea centralis and allow us to distinguish between different colors
23
The 3 kinds of cones are
see red, green , blue
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Fluids of the eye
fill the spaces in the eye, help to maintain the normal shape, and reflect light
25
Aqueous humor
watery fluid in the anterior or front chamber of the eye constantly being formed,drained and replaced if it is blocked,pressure inside the eye will build up(glaucoma)
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Aqueous humor is located
watery fluid in the (anterior or front) chamber of the eye
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Vitreous humor
jelly-like fluid in the posterior chamber of the eye
28
Vitreous hunmor is located
in the posterior chamber of the eye
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Retina
makes up most of the inner layer that contains the microscopic photoreceptors cells that detect light
30
Pupil
black center of the iris it is actually a hole in the doughnut shaped iris muscle
31
Iris
colored portion of the eye behind the cornea , it is a muscle that dilates and constricts to let light in
32
Glaucoma
an abnormal condition of increased pressure within the eye . prolonged pressure can damage the retinal and optic nerve
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Presbyopia
hyperopia (farsightedness) and impairment of vision caused by advoncing years
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Astigmatism
uneven focusing of the image,resulting from distortion of the curvature of the lens or cornea
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Strabismus
crossed eye ,eyes don’t line up in the same direction
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Myopia
nearsightedness; parallel rays entering the eye are focused in front of the retina producing a fuzzy image . if our eyeballs are enlongated the image focuses in front of the retina rather than on it .
37
Hyperopia
farsightedness, inability of the eye to focus on nearby objects; rays of light entering the eye are brought to focus behind the retina producing fuzzy image