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Eyes

TermDefinition
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
 

 



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