Save
Busy. Please wait.
Log in with Clever
or
show password
Forgot Password?
Don't have an account?  Sign up 
Sign up using Clever
or
Username is available taken
show password


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. Your email address is only used to allow you to reset your password. See 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.
focusNode
Didn't know it?
click below
 
Knew it?
click below
Don't Know
Remaining cards (0)
Know
0:00
edit
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

HBS 2.4 Key Terms

Optical

TermDefinition
Accommodation the automatic adjustment of the eye for seeing at different distances affected chiefly by changes in the convexity or the crystalline lens
Astigmatism a defect of an optical system causing rays from a point to fail to meet a focal point resulting in a blurred and imperfect image
blind spot the small circular area in the retina where the optic nerve enters the eye that is devoid of rods and cones and is insensitive to light
cone any of the conical photosensitive receptor cells of the vertebrate retina that function in color vision
cornea the transparent part of the coat of the eyeball that covers the iris and pupil and admits light to the interior
Depth perception the ability to judge the distance of objects and the spatial relationship of objects at different distances
Hyperopia a condition in which visual images come to a focus behind the retina of the eye and vision is better for distant than for near objects (can't see close objects well)
iris the opaque muscular contractile diaphragm that is suspended in the aqueous humor in front of the lens of the eye, is perforated by the pupil and is continuous peripherally with the ciliary body, has a deeply pigmented posterior surface which excludes the
Myopia a condition in which the visual images come to a focus in front of the retina of the eye because of defects in the refractive media of the eye or of abnormal length of the eyeball resulting especially in defective vision of distant objects
optic nerve transmits visual information from retina to the brain
pupil the opening in the iris, which admits light into the interior of the vertebrate eye
Refraction the deflection from a straight path undergone by a light or a wave of energy in passing obliquely from one medium into another in which its velocity is different
rod any of the long rod-shaped photosensitive receptors in the retina responsive to faint light
Created by: Escalena1
Popular Biology sets

 

 



Voices

Use these flashcards to help memorize information. Look at the large card and try to recall what is on the other side. Then click the card to flip it. If you knew the answer, click the green Know box. Otherwise, click the red Don't know box.

When you've placed seven or more cards in the Don't know box, click "retry" to try those cards again.

If you've accidentally put the card in the wrong box, just click on the card to take it out of the box.

You can also use your keyboard to move the cards as follows:

If you are logged in to your account, this website will remember which cards you know and don't know so that they are in the same box the next time you log in.

When you need a break, try one of the other activities listed below the flashcards like Matching, Snowman, or Hungry Bug. Although it may feel like you're playing a game, your brain is still making more connections with the information to help you out.

To see how well you know the information, try the Quiz or Test activity.

Pass complete!
"Know" box contains:
Time elapsed:
Retries:
restart all cards