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54 Cards in this Set
- Front
- Back
Cones are responsible for:
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Day Vision, detail and color
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Rods are responsible for:
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Night vision, peripheral, and black & white
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Exo means.....
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Out
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Eso means....
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In
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Hyper means....
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Up
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Hypo means....
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Down
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Phoria means...
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Tendency
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Tropia means
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Definite and obvious
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Aniseikonia means....
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Unequal retinal size
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Iseikonic means...
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Lenses that manipulate image size
*When you have unequal image sizes, fusion is hard to occur. |
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Gray lens color
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Nuetral, transmits colors evenly-sees colors as they are, reduces glare.
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Green Lens
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Resemble natural color sensitivity, allows maxium amount of useful light to reach eyes, reduces glare
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Brown & Amber Lens
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Blocks blue light, reduces glare, improves contrast
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Polorized
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Prevents light from scattering, which causes glare made from crystals that are alighned so that they change orintation of the light rays.
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Anti-Reflective Coating
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Blocks light reflections, including reflections off back of lens into your eye
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Spectrum nm 589
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Controls light to enhance color contrast, see colors accurately, intensifies perception of red, green, yellow & blue
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Ultraviolet
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Not visible to the human eye. Means beyond violet
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Photo keratis
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Effects cornea and conjunctiva.
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Cataracts
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Effects crystalline lens and macular swelling. May cause pinguecula - yellowish spots on the front of the eye
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UV coating for the lenses....
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Sunscreen for your eyes.
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UV C=
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200-290nm
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UV B=
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290 - 320nm
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UV A=
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320 - 400nm
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Blue Light
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400 - 500nm. Percievable by the eye. May damage retina. Passes through the crystaaline lens to retina. Causes glare on sunny days. May cause macular degeneration.
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5 Layers of the cornea
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1.Epithellum 2. Bowman's Layer 3. Stroma 4.Decements Layer
5. Endothellum |
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Nanometer
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One billionth of a meter
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UV
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-200 -400
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Visable
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-380 -760
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Infared
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>760nm
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V I B G Y O R
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Violet, indigo, Blue, Green, Yellow, Orange, Red.
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ROY G. BIV
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The Light Spectrum Backwards
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"Milli" means
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Thousandth
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1 Millimeter equals
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1/1000 of a meter
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"Centi" means
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Hundredth
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Rods are repsonsible for:
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Night vision, peripheral, and black & white
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UV B =
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290 -320nm
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UV Coating for lenses provides.....
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Sunscreen for your eyes.
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Cr-39 is what index of refraction
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1.498
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Crown glass is what index of refraction
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1.523
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Hi-lite is what index of refraction
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1.70
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Index of refraction is measured by what mathematical symbol.
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N
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N =
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Speed of light in the air.
___________________ Speed of light in material. |
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F =
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Focal length
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D =
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Diopter
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Stronger power =
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Shorter focal lengths
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Weaker powers =
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Longer focal points
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Minus powers =
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Negative focal lengths
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Plus powers =
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Positive focal points
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Fresnel Prism
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Used in vision therapy. It's a "cling" on type prism, can be easily taken off. Does not add any thickness to lenses.
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"A" =
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Eye Size
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"B" =
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Vertical measurement
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"DBL" =
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Distance between lenses.
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"ED" =
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Effective diameter
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Frame PD =
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A + DBL
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