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44 Cards in this Set
- Front
- Back
- 3rd side (hint)
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The lipid layer is formed by |
The Meibomian glands |
Oils come from glands |
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The mucin layer is formed by |
The Goblet cells |
Mucus is formed by cells |
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Which slit lamp illumination is best used to observe fluorescene patterns? |
Diffuse illumination |
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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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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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Red Free Slit Lamp Filter |
Used to observe neovascularization |
Blood is red.. this is red free... hmmmm... |
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Optic Section |
Used to observe corneal thickening, thinning, and the depth of scars |
Cross section.. |
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Sagittal Value describes.. |
Lens Vault |
The answer is locked in the v___ |
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Anisometropia |
A condition where each of the two eyes have unequal refractive errors, but are both hyperopic or myopic. |
Condition where one eye is "stronger" than the other. |
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Antimetropia |
A condition where the eyes have refractive errors that differ. |
Anti = Opposites |
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Conventional Slab Off Prism |
Base Up in the Most Minus eye |
Base Direction? |
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Reverse Slab Off Prism |
Base Down in the Most Plus eye |
Base Direction? |
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True or false. Reverse Slab Off is molded, NOT ground. |
True |
Reverse |
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Excessive movement of a soft contact lens can be corrected by |
Larger diameter, steeper base curve |
Think of 2 ways you could reduce movement |
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What is the primary cause of spherical aberration? |
Incorrect base curve |
Why do we use corrected curve theory? |
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Name for the refractive error when light focuses before the retina |
Myopia |
If your eyeball is too long, you have the axial form. |
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Name for the refractive error when light focuses after the retina |
Hyperopia |
Premature babies often have this error because their eyes are too small and their crystalline lenses are too weak. |
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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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Which instrument is the most accurate for measuring the diameter of a contact lens? |
Measuring magnifier |
You want to measure something small... |
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What is a Strabismus? |
A permanent displacement of the eye, usually caused by a muscle problem. |
StrabisMUS |
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What is the ANSI tolerance in diopters for a contact lens with a power of -5.00? |
0.12 diopters |
The ANSI tolerance for all spherical contacts under 10.00 diopters is 0.12. Over 10, and that changes to 0.25 diopters. |
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What would be a patient's chief complaints if a contact lens were fit too tight? |
Burning, stinging, and blurred vision. |
Their eyes would "feel hot" 👀🔥 |
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What are the two factors that determine lens vault? |
Base curve and poz size |
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What is the minimum blank size formula? |
ED +2 (total decentration) |
You need the ED and the PD. |
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Which layer of the tear film changes the corneal surface from hydrophobic surface to a hydrophilic one? |
Mucin layer |
This is the same layer that is produced by the Goblet cells. |
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What does a lid recording of -2 indicate? |
Eyelid rests 2mm below limbus |
It's a LID recording. |
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What is the rule of thumb when selecting the diameter of a soft contact lens? |
2mm larger than the HVID |
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ANSI tolerance for total diameter of an RGP lens is |
0.05 millimeters |
It's really really small |
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Which slit lamp illumination is best used to view the endothelium? |
Specular Reflection |
The endothelium is at the back of the cornea, so you'll need the light to reflect. |
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Residual astigmatism can usually be tolerated if the amount is less than |
0.75 Diopters |
How many Diopters? |
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Name 2 tools that can be used to check the diameter of a contact lens |
Measuring magnifier and V-groove |
One slides, one magnifies |
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3 o'clock, 9 o'clock staining is most often seen in connection with which lens material? |
PMMA |
4 letters |
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The size of the corneal cap from which K readings are taken is |
3 millimeters |
How many letters in cap? |
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A contact lens fitting method that employs the use of charts is called the |
Dyer Monogram method |
One chart (Mono,... |
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A fitting method based on the physical size and shape of the eye is called the |
Hartstien Modification |
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Which instrument can be used to check peripheral curve width? |
Hand Magnifier |
Peripheral curves are SMALL |
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What kind of contact lenses should fluorescien dye never be used on? |
Silicone Hydrogel |
It's okay on RGPs... |
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The pH level of human tear film is |
7.4 |
Slightly alkaline |
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What does adding an IPC do to a lens fit? |
It loosens it. |
Does it tighten, or loosen it? |
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Which kind of bifocal contact lenses can rotate without affecting vision? |
Annular Bifocal Contacts |
It's easy as ABC... |
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Which corneal layer is responsible for keeping the cornea in a state of deturgesence? |
The endothelium |
It's the layer that does NOT quickly reproduce. |
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The Fairness to Contact Lens Consumers Act of 2003 was enacted by |
the Federal Trade Commission |
FTC, fairness to contact |
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What is the procedure for drop ball testing of safety lenses? |
For ANSI standards, a 5/8th inch steel ball is dropped onto the lens from 50 inches up. For OSHA standards, a 7/8th inch steel ball is used. |
State the ball size for both ANSI and OSHA |
