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BOARDS2: Contact lenses > CL materials > Flashcards

CL materials Flashcards

1
Q

what classifies AIDS

A

HIV + CD4 count <200

HIV+ 1 AIDS defining illness (CMV, Kaposi Sarcoma, HSK, non healing ulcer for 1 month)

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2
Q

PMMA lenses

A

Dk of 0, hydrophobic, less wettable, excellent optics

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3
Q

what is an advantage of PMMA lenses compared to SCL materials?

A

clearer optics

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4
Q

what does a red cap on a CL solution mean

A

it should not be put directly into the eye

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5
Q

what cn be measured with a radiuscope

A

BC

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6
Q

hydrogel SCL

A

primarily made of HEMA. Hydopgilic lenses with adequate oxygen permeability

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7
Q

siHy

A

made of silicone and water (newest technology) and are more permeable to oxygen than traditional hydrogel SCL

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8
Q

conventional RGP

A

were composed of PMMA, which is hydrophobic, light weight, excellent optics, but not oxygen permeability. Rarely used today

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9
Q

current RGP lenses

A

made of fluoro-silicone-acrylate. wettable, have minimal protein deposits, and have adequate oxygen permeability. Should be replaced more frequently as the Dk increases. examples of GP CLs include Boston, Fluoroperm, and Paragon

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10
Q

Group 1 hydrogels

A

low water, nonionic

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11
Q

group 2 hydrogels

A

hi water, nonionic

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12
Q

group 3 hydrogels

A

Ionic, low water

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13
Q

group 4 hydrogels

A

ionic, high water

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14
Q

group 5 SCL

A

siHy

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15
Q

how to remember the different FDA classifications for hydrogels

A

NNII, low high low high

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16
Q

low water SCLs

A

dailies

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17
Q

high water SCLs

A

extended wear

18
Q

which group of CLs gets more deposits

A

group 4

19
Q

rigidity

A

additional property of SCL that describes the stiffness of the material. it depends on the thickness and the modulus of elasticity of the CL (primarily applies to SiHy). in general, as water content increases, the modulus of elasticity decreases (SiHY becomes less rigid)

20
Q

when going from PMMA to RGP

A

stay in low Dk and then work up

-low Dk more sturdy and what they are used to

21
Q

high modulus

A

less water, stiffer

22
Q

benefits of high modulus

A

better handling

easier application and removal

23
Q

cons of high modulus

A 
GPC
SEALS
Limbal epithelial hypertrophy 
mucin balls
edge fluting
24
Q

spin cast

A

the SCL is made by a rotating mold

25
Q

lathe cut

A

the SCL is made by cutting and is then ground with a lathe (diamond or laser)

26
Q

molded

A

SCL material is in a liquid state and is injected into a mold

27
Q

relative and absolute contraindications for CL wear

A 
AIDS or any immunocompromised state
corneal infection or inflammation
hx of CL overwear 
anterior seg disease 
excessive dry eye 
irresponsible patient 
young children 
systemic conditions with poor wound healing 
decreased immune response 
monocular patients 
filtering bleb 
incomplete blinkers
28
Q

therapeutic CLs indications

A 
keratoconnus or ectasia
corneal abrasions/erosions (BCL)
corneal distortions (GP)
aniridia, occlusion to eliminate diplopia, or cosmoses (tinted or opaque CLs)
reduce myopia progression (orthoK)
aphakia 
Tx od DED (sclerale)
29
Q

orthoK

A

reverse geometry design that may be helpful to reduce myopia progression

30
Q

keratoconnus and CL

A

Rose K CL, GP CL, with a soft skirt GP lens piggy back on SCL

31
Q

presbyopia and CL

A

monovision, MFSCL, bifocal GP

32
Q

dry eye and CLs

A

thick traditional hydrogel lenses or siHy CL

33
Q

children and CL

A

dailies to minimize the effect of inadequate CL maintenance and cleaning

34
Q

To minimize GPC

A

dailies, clear care

35
Q

SJS and CL

A

scleral oir haptic GPCL

36
Q

extended wear CL

A

FDA approved contact lens material

37
Q

enzymatic cleaners

A

remove accumulated deposits from the surface of the CL

heavy deposited, complaints of protein deposits

38
Q

instrument to measure power

A

lensometer

39
Q

instrument to measure BC

A

radiuscope or keratometer

40
Q

instrument to measure CT

A

thickness gauge

41
Q

instrument to measure OAD, OZD, peripheral curve widths

A

measuring magnifier, reticule

BOARDS2: Contact lenses (5 decks)

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