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24 Cards in this Set
- Front
- Back
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Aqueous layer |
Middle layer, produced by lacrimal gland, made up of salts and sugar spiky |
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Oily layer |
Outermost layer , produced by meimbomian glands , lipid layer |
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Average blinking rate? |
7x |
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5 layers of the cornea |
Epithelium Bowman Stroma Decemets Endothelium |
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Anatomical disorders and contraindications for CL wear |
Pregnancy Keratoconus Dry Eye Diabetes |
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BASE CURVES |
8.0 - steep 8.4 median 9.0 flat |
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K readings |
40 flat 44 average 46 steep |
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WTR |
+ cyl x 90 or - cyl x 180 |
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Soft CL lenses are made of |
Hydrophilic plastics |
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Soft contact lens design |
Spin casting Dry casting Lathe cutting Lenticular |
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Aspheric lens |
Only used on ASTIGMATISM patients |
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Base curve |
Primary curve of the CL designed to match the Contour of the cornea |
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Sagittal depth |
Vertical depth of the CL AKA VAULT steeper the lens the greater the sagittal depth |
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Soft CL should have a |
Diameter of 1-1.5 mm larger than the iris diameter |
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Center thickness |
Thickness of the geometric center of the lens . Determines both 02 and permeability |
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More water content |
The thicker the lens will be |
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Daily cleaners |
Enzymatic cleaners can clean up proteins from tear film |
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Reactions to daily cleaners |
Lens dryness Ocular irritations Acute red eye (sudden) |
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Preservatives can cause |
Lens discoloration Chronic red eye |
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Cleaning systems |
Peroxide kills all microbes, fungi, HIV |
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Which of the following lens solutions may cause sensitivity with red eyes as their only symptoms ? |
Enzymes Thimerosal Chlorexheaxdine |
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Average diameter of a soft CL |
13.8 mm - 14.5 mm |
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Normal TBUT time is |
15-45 secs |
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Diameter of the soft CL should be at least _____ larger than the cornea |
2—-3 mm |
