Busy. Please wait.

show password
Forgot Password?

Don't have an account?  Sign up 

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.
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.
Don't know
remaining cards
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:
restart all cards
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


Cornea Transparent part of the eye. Continuous with the sclera.
Sclera White part of the eye. Outermost layer of the eye made up of tough connective tissue.
Choroid Middle layer of the eye. Made up of melanocytes that absorb light.
Tapetum Reflective layer found in some animals. Allows for night vision.
Retina Innermost layer. Made up of photoreceptors. (Rods and Cones)
Aqueous Humor Located at the front of the eye. Provides shape and nourishment to the front of the eye.
Iris Coloured part of the eye. Made up of smooth muscles and connective tissue. Controls the amount of light entering the eye.
Lens Transparent tissue that is stretched and compressed to focus light on the retina. Held in place by cilliary muscles.
Vitreous Humor Located inside the eyeball. Provides nutrients and shape to the inside of the eyeball.
Rods Located in the retina. Used for black and white and night vision.
Cones Located in the retina. Used for coloured vision. Three types: red, blue, and green
Night blindness When the rods do not function properly.
Colour blindness X-linked recessive. Cones don't work properly or at all.
Glaucoma An increased amount of aqueous humor or fluid in the eye creates pressure that will lead to blindness.
Myopia Nearsightedness. The eyeball is too long. Need concave lens to fix.
Hypermetropia Farsightedness. The eyeball is too short. Need convex lens to fix.
Cataract The lens becomes cloudy or opaque
Astigmatism Uneven curvature of the cornea or lens.
Created by: Mystyn