Help
Options
Didn't know it?
click below
click below
Knew it?
click below
click below
Don't Know
Remaining cards (0)
Know
retry
shuffle
restart
0:00
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.
Normal Size Small Size show me how
Normal Size Small Size show me how
Packet
Chapter 15
| Question | Answer |
|---|---|
| secures the lens to the ciliary body | ciliary zonule |
| fluid that fills the anterior segment of the eye; provides nutrients to the lens and cornea | aqueous humor |
| white, opaque portion of the fibrous layer | sclera |
| area of the retina that lacks photoreceptors | optic disc |
| muscular structure that manipulates the lens | ciliary body |
| nutritive region of the middle layer of eyeball | choroid |
| drains the aqueous humor of the eye | canal of schlemm |
| portion of the inner layer concerned with image formation | retina |
| gel-like substance, filling the posterior segment of the eyeball; helps reinforce the eyeball | vitreous humor |
| drains into the scleral venous sinus (canal of schlemm) | aqueous humor |
| smooth muscle structures | ciliary body,iris |
| refractory media of the eye | aqueous humor, cornea, lens,vitreous humor |
| anteriormost clear part of the fibrous layer | cornea |
| pigmented "diaphram" of the eye | iris |
| area of acute or discriminatory vision | fovea centralis |
| lenses | lens |
| diaphragm | iris |
| light-sensitive layer of film | retina |
| focusing by changing the focal distance | accommodation |
| case | sclera |
| reducing light entry by selecting | pupillary constriction |
| the closest point at which clear focus is possible | near point of vision |
| the electromagnetic waves to which the photo-receptors of the eyes respond | visible light |
| the point at which light rays are converged by a convex lens | focal point |
| a lens that is thickest at the edges; diverges the light rays | concave lens |
| the point beyond which accommodation is unnecessary | far point of vision |
| light bending | refraction |
| ability to focus for close vision (under 20 feet) | accommodation |
| normal vision | emmetropia |
| inability to focus well on close objects; farsightedness | hyperopia |
| reflex constriction of pupils when they are exposed to bright light | photopupillary |
| clouding of lens, resulting in loss of sight | cataract |
| nearsightedness | myopia |
| burred vision, resulting from unequal curvatures of the lens or cornea | astigmatism |
| condition of increasing pressure inside the eye, resulting from blocked drainage of aqueous humor | glaucoma |
| medial movement of the eyes during focusing on close objects | convergence |
| reflex constriction of the pupils when viewing close objects | accommodation pupillary reflex |
| inability to see well in the dark; often a result of vitamin A deficiency | night blindness |
| how many variety of cones are there? | 3 |
| colors of light that the cones respond to | red, blue, green |
| lack of all color receptors results in | total color blindness |
| because color blindness is sex linked it occurs most commonly in | males |
| black and white or dim vision is a function of the | rods |
| density of cones is greatest in the | fovea centralis |
| rods are the densest in the | retinal periphery |
| attached to the eyes are the | extrinsic muscles |
| anterior aspect of each eye is protected by the | eyelids |
Created by:
csouder