Eye - Chapter 12

Term Definition
Sclera Tough, white outer layer of the eyeball (6 muscles attach and move the eye around)
Cornea colourless, transparent, front part of the sclera where light enters "window of the eye"
Pupil The 'window' through which light enters the lens of the eye
Iris Color ring around the pupil that contracts and relaxes regulating the amount of light entering the eye
Retina Light rays converge here
Rods Sensitive to bright light
Cones Sensitive to colour
Optic Nerve Nerve that transmits signals from the retina of the eye to the brain for interpretation
Blind Spot area of the retina where the optic nerve and blood vessels connect – there are no rods or cones there
Ciliary Muscles Bands of muscles behind the pupil that holds the lens in place
Normal Vision Normal vision is 6/6 which indicates what can normally be seen at 6 metres.
Refractive Vision Problems Vision defects that prevents an eye from focusing an image properly on the retina
Aqueous Humor Directly behind the corneo in a transparent liquid
Lens Thick double-convex tissue
Vitreous Humor Behind the lens is a transprent jelly-like material
List in order the refracting parts of the eye (4 things) 1. Cornea, 2. Aqueous Humor, 3. Lens, 4. Vitreous Humor
Retina is made up of two kinds of nerve cells: Rods and Cones
We actually "See" with what organ? The brain
Myopia Can see nearby things but not distant objects
Hyperopia Can see distant objects clearly but have trouble focussing on object close up
Astigmatism A condition in which the corenea has a irregular curve.
Additive colour mixing Process of adding together colours of light to produce other colours
Primary light colours red, blue and green
Secondary light colours created when primary light colours are combined – magenta yellow and cyan
Complementary light colours Any two colours of light that produce white light when added together

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