Busy. Please wait.
or

show password
Forgot Password?

Don't have an account?  Sign up 
or

Username is available taken
show password

why


Make sure to remember your password. If you forget it there is no way for StudyStack to send you a reset link. You would need to create a new account.
We do not share your email address with others. It is only used to allow you to reset your password. For details read our Privacy Policy and Terms of Service.


Already a StudyStack user? Log In

Reset Password
Enter the associated with your account, and we'll email you a link to reset your password.

Remove Ads
Don't know
Know
remaining cards
Save
0:01
To flip the current card, click it or press the Spacebar key.  To move the current card to one of the three colored boxes, click on the box.  You may also press the UP ARROW key to move the card to the "Know" box, the DOWN ARROW key to move the card to the "Don't know" box, or the RIGHT ARROW key to move the card to the Remaining box.  You may also click on the card displayed in any of the three boxes to bring that card back to the center.

Pass complete!

"Know" box contains:
Time elapsed:
Retries:
restart all cards




share
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

visual system

anatomy and physiology visual system

QuestionAnswer
Name the primary organs of vision Eye optic nerve Chasm &tract cranial N. 2 thalamus of the brain Primary visual cortex Lateral geniculate nucleus, in the thalamus
Eye is long myopia
Lens is clouding up cataracts
Loss of lens elasticity presbyopia
Poor drainage of aqueous humor by canal of schlemm glaucoma
Eye is short hyperopia
Irregular curvature of the lens or cornea astigmatism
Symptom of myopia? Objects appear blurry far away Difficulty seeing close objects
symptom of cataracts? Lens is clouding up
symptom of presbyopia? Loss of lens elasticity
symptom of glaucoma? Poor drainage of aqueous humor by canal of schlemm
symptom of hyperopia? Eye is long,farsighted objects are blurry close up
symptom of astigmatism? Irregular curvature of the lens or cornea
Secondary organs of vision Extra-ocular eye muscles Eyelids conjunctiva, lacrimal apperatus
Function of the retina thin layer of tissue lines the back of the inside of the eye , it receives light that the lens has focused converts into neural signals and then sends these signals to the brain for visual recognition.
optic nerve function Transfers visual information from the retina to vision centers of the brain, via electrical impulses.
optic nerve made up of? ganglionic cells or nerve cells of over one million nerve fibers
Rods- type 1 of 2 types of photo receptors *Night vision- light sensitive *can fire in low light only once * Best for peripheral vision * peripheral has majority of rods. * Only one type of rod. +not at the back of eye Front and side only
Cones- 2nd type of photo receptors Day vision or color vision Less sensitive to light Best for central vision+very little at sides 3 types of cones: red blue green cones
What is the visual reflex center called? Superior colliculus
Where is there an increase in intra-ocular pressure? what is the pathology? describe glaucoma
Where is the primary structure of vision located? The visual reflex center -superior colliculi
accommodation reflex
Where is the greater amount of cones located? The macula lutea