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35 Cards in this Set
- Front
- Back
- 3rd side (hint)
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Hyperflange |
Used to thin the edge of a HIGH MINUS contact lens. |
Hyperflanges are not for Hyperopia... |
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TUHOY, Kevin
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Introduced plastic corneal lens. (1947)
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Plastic pioneer
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Soft Lenses became available in...
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1971
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In what year did Kevin Tuhoy introduce the plastic corneal lens?
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Truncation
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Cutting off a portion of a lens(usually Bifocal) in order to stabilize it.
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Tree trunks don't move...
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Along with the Posterior Optical Zone (POZ) size, this determines lens vault.
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Base Curve
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It's pretty base-ic...
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KALT, Eugene
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Fit first Keratoconus lens. (1888)
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K is for KALT, K is for...
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WICHTERLE, Otto
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Introduced soft (HEMA) lenses. (1960)
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Otto, you big softie!
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HEMA
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Soft Lens material
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What's it used for Otto? :D
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Will a flatter curve have a longer, or steeper radius of curvature?
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Longer
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If a hill is flat, is it steep?
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What type of astigmatism?
45.00@20 / 46.00@110 |
With the rule
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WTR=Flatter Horizontally
ATR=Flatter Vertically Irregular= Not within 30° of 90 or 180 Oblique= Meridians less than 90° apart |
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The area of the cornea with the steepest curvature is the...
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Apex
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Alpha, Peak, Climax
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First step before using Keratometer...
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Adjust the Eyepiece
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What's the first step in using your Lensometer?
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Topographer
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Provides a computer-generated map of corneal curvature.
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Computers and Maps
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How much corneal astigmatism?
46.00@180 / 43.75@90 |
2.25 Diopters
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Just make sure you subtracted properly.
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How can a +1.25 auxiliary lens be used in Keratometry?
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Extends the range of the Keratometer upwards from 52.00 to 61.00 Diopters.
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More power to you..
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What type of astigmatism?
43.00@145/ 41.00@55 |
Irregular Astigmatism
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WTR=Flatter Horizontally
ATR=Flatter Vertically Irregular= Not within 30° of 90 or 180 Oblique= Meridians less than 90° apart |
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Sclerotic Scatter |
Illumination used to detect disturbances in normal corneal transparency. |
SCATTERS light thru cornea.. |
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Direct Focal Parallel Piped |
Illumination used to detect vertical striae. |
Vertical stripes.. |
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Diffuse Illumination
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Used to observe fluorescein patterns
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You know this!!
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What does Rose Bengal do?
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Stains devitalized cells
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You know this!! Remember A&P?
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Red Free Slit Lamp Filter |
Used to observe neovascularization |
Blood is red.. this is red free... hmmmm... |
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Specular Reflection Illumination
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Used to view the endothelium
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Fluorescein dye is best illuminated by..
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Cobalt Light
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It's a blue-ish slit lamp filter...
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Optic Section |
Used to observe corneal thickening, thinning, and the depth of scars |
Cross section.. |
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What lens material would be used for someone interested in intermittent wear?
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HEMA
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Soft
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In cases of high corneal astigmatism, which type of RIGID lens would probably result in the best fit? |
Bitoric |
Goes both ways.. |
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Wetting angle describes..
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The ability of a fluid to spread across the surface of a Rigid lens
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Definition
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What does D.K. value of a material indicate?
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Permeability
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O2 flow..
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Which lens material would alleviate problems such as corneal hypoxia and excessive deposits?
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FSA
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Fixes Sh! Already
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What is the correct base curve and power for this patients contact lens if fit on "K"?
43.00/ 44.25@90 -4.00+1.25@90 |
43.00 -2.75
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Check your transposition.
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Sagittal Value describes.. |
Lens Vault |
The answer is locked in the v___ |
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Compensate for vertex distance when more than..
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4 Diopters of power
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Not 7.
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Which lid position is preferred for fitting Rigid Gas Permeable lenses?
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U +2, L=0
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Up Up
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When observing a fluorescein pattern, what would an oval touch in the vertical meridian indicate?
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A flat fit and against the rule astigmatism.
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Describe the fit and type of astigmatism.
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True or False: D.K. value increases with water content.
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True
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Think about it. Water contains oxygen...
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