Term
| What important part of the eye holds tear fluid? |
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Definition
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Term
What are the causes of glaucoma?
What part of the eye can this cause damage to?
Who is mostly at risk? |
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Definition
Intraocular pressure buildup, improper drainage of aqueous humor
Optic Nerve
African American |
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Term
T/F
Macular Degeneration is irreversible
Who is mostly at risk? |
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Definition
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Term
Which opthalmic disease is associated with diabetes?
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Definition
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Term
1)normal vol of tear fluid in Cul-de-sac____
2)max vol in cul-de-sac_____
3)optimal vol for opth. soln____
4) Normal vol of a drop____ |
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Definition
1)normal vol of tear fluid in Cul-de-sac 7-8 mcL
2)max vol in cul-de-sac 30mcL
3)optimal vol for opth. soln 5-10 mcL
4) Normal vol of a drop~50mcL |
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Term
| What is the residence time and bioavailabilty for eye drops? |
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Definition
Res time (1-2min) low
Bioav( ~<1%) very low |
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Term
T/F
An opthatlmic soln should have low viscosity |
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Definition
FALSE
want high viscosity |
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Term
What sterility techniques are used for opth.?
Are there preservatives? |
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Definition
Autoclaving/filtration
Yes but limited in used during eye surgery(LVP) |
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Term
What tonicity should opth. have?
This is equivalent to ____NaCl in ___water |
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Definition
Isotonic
0.9 gNaCl in 100mL water |
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Term
How would you adust...
a) tonicity of fluid> body fluid
b)tonicity of fluid<body fluid |
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Definition
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Term
100 mL of a solution contains 1g Atropin sulfate and 0.5g of Boric acid. How much NaCl should be added to make an isotonic solution?
Atropine: NaCl equiv=0.12
Boric Acid: NaCl equiv=0.52 |
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Definition
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Term
T/F
Hard contact lenses may be useful for astigmatism |
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Definition
FALSE
hard contacts wont change the shape of the eye (astigmatism) |
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Term
Hard, Soft, RGP contacts
a) 13-15mm, contain 30-80% water, permeable to oxygen
b) Durable, rigid plastic resin, impermeable to oxygen
c) Hydrophobic material, durable and oxygen permeability |
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Definition
a) Soft
b) hard
c) rigid gas permeable |
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Term
Hard, Soft, or RGP lenses
a) pourous, less durable, hydrophilic transparant plastic, accumulae proteinaceous matter
b) do not attract proteins, most preferred
c) 7-10mm, need soln to provide cushioning |
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Definition
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Term
| What cleaning agents are used for contact lenses? |
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Definition
Surfactants (non ionic)
Chealating Agents
Enzymatic cleaners |
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Term
What are used as buffers for contact lenses?
What are used as lubricants for contacts? |
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Definition
Citrates and Phosphates
Propylene glycol, PEGs, HPMC |
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Term
What are the preservatives ad disinfectants used for contacts?
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Definition
Thimersal, Hydrogen Peroxide, Benzalkonium Chloride
Boric Acid/scorbic acid
Chlorhexidine
Polyhexamethylene biguanide |
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