CL Care and Maintenance Flashcards

1
Q

FDA Group 1

A

Low water content, non-ionic

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2
Q

FDA Group 2

A

High water content, non-ionic

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3
Q

FDA Group 3

A

Low water content, ionic

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4
Q

FDA Group 4

A

High water content, ionic

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5
Q

why do we have silicon in lenses?

A

great affinity for oxygen; increases transmissibility of oxygen to our eyes

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6
Q

con of silicon

A

hydrophobic (repels charged particles and attracts uncharged particles)?

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7
Q

what lens does not belong into any of the FDA groups?

A

Dailies Total 1

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8
Q

ionic lenses

A

charged and attracts oppositely charged particles

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9
Q

1234
LHLH
NNII

A

fda group mneumonic

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10
Q

Fluorine advantage to lenses

A

attracts water and keeps lens moist; reason why we choose lenses with Fluorine

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11
Q

What filter makes staining easier to visualize?

A

wratten filter

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12
Q

why do we need to rub the lens?

A

! Rinsing alone does not detach adherent/penetrating fungi
! Micro-organisms are not the only ‘concern’
! other lens contaminants also require removal
! finger-borne contaminants (←lens handling)
! inevitable surface deposition needs to be contained
! a clean lens is usually more comfortable
! Lens wettability is enhanced

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13
Q

is unpreserved normal saline ok to use for lens care?

A

no

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14
Q

Any process that kills or eliminates transmissible agents

A

sterilization

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15
Q

The killing and/or the removal of some or all resident pathogenic organisms

A

disinfection

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16
Q

The killing, and/or the inhibition of growth, of selected micro-organisms

A

preservation

17
Q

WHAT IS A CLEANING SOLUTION?

A

Contains cleaners which are ionic or nonionic surfactants.
EDTA may be used to enhance microbial activity of the preservatives and soften the water by removing ions which also enhances the cleaning activity.
Mild abrasives may be added Opti-Free.* Usually not meant for use in the eye. Visibly tinted e.g., Boston Advance

18
Q

daily cleaner function action

A

Emulsify or solubilize contaminants and/or loose foreign matter on lens surfaces

19
Q

WHAT IS A SURFACTANT?

A

A surfactant cleaner lowers surface tension and emulsifies lipids, oils and other materials.
Prophylactic daily use to prevent deposits.
Rub vs No Rub (Mechanical cleaning vs Rinse only)

20
Q

uncharged molecule

A

lipids anchor onto hydrophobic lens or epithelium and consequently brings water with them

21
Q

WHAT IS AN ENZYMATIC CLEANER?

A
  • Effective in removing proteinaceous coatings.
  • Proteolytic enzymes (breaks down protein bonds)
  • Papain (papaya-based enzyme/meat tenderizer)
  • Pancreatin (hog pancreas derived enzymes protease,lipase & amylase)
  • Subtilisin (extracellular enzyme produced by B. licheniformis)
22
Q

ENZYMATIC PROTEIN REMOVERS PANCREATIN

A

! Protease (protein), lipase (lipid) and amylase (polysaccharides)
! Pig pancreas derivative
! Cleaning efficacy similar to papain

23
Q

ENZYMATIC PROTEIN REMOVERS

SUBTILISIN A & B

A
! Proteases
! Derived from Bacillus bacteria 
! Low toxicity; used in food products
 ! Less specific binding characteristics 
! May be more effective than papain
24
Q

WHAT IS A SOAKING SOLUTION?

A

Maintains hydration, prevents contamination from microorganisms, helps maintain a clean surface by solubilizing debris
Usually not meant for use in the eye

25
Q

WHAT IS A PRESERVATIVE?

A

Inhibit all microbial growth
Maintain the number of micro-organisms below a certain (safe) level
Act as a LCP ‘defence system’ Must be:
compatible with ingredients, CLs, & container non-toxic & non-irritating
stable over time
effective against a broad spectrum of organisms
Preservative free vs disappearing preservatives