Quiz For All About SiHy

What is the first practical plastic contact lens

CAB

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PMMA

Correct Incorrect Correct answer

HEMA

Correct Incorrect Correct answer

TRIS

Correct Incorrect Correct answer

Which classification does not apply to a GP lens

low Dk

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high Dk

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moderate Dk

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mid Dk

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SiHy lenses are a combination of which polymers

HEMA and silicone

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PMMA and HEMA

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HEMA and TRIS

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hydrogel and PMMA

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Modulus is _______________________

the amount of measured strain in a polymer

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the amount of force applied to a lens during testing

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stress divided by strain in a lens material

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completely dependent on lens thickness

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What is one way to measure lens material wettability

using the contact angle

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with a lens caliper

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this cannot be measured

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patient subjective feeling during a blink

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How often are frequent replacement lenses discarded

daily

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every six months

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every one to three months

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bi-weekly

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What was a primary drawback of pHEMA

it was too expensive

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the lenses were too thick for good oxygenation

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the lenses can only be used as a implant

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it is not strong enough for overnight wear

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What is a favorable property of silicone

poor performance

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thermally unstable

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comfortable for a healing eye

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extremely hydrophilic

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Which addition can make silicone more hydrophilic

polyethylene glycol

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polymethylmethacrylate

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custom lathing

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extra Dk

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A standard test for CoF ___________________________

is never performed by the government

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routinely leaves out one or two lens properties from a study

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has not been perfected

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is done in office prior to dispensing lenses

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What is PVP

a storage chemical

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a pale blue tint in the contact lens

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an agent added to produce mucin balls

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polyvinylpirrolidone

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Which is a correct statement

SiHy material efrofilicon A cannot be customized

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SiHys were the first material to be approved by the FDA for wear up to 30 days

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SiHys are only lathed

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SiHys can be manufactured on a large scale

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How many soft lenses fit in the United States are created from SiHy material

50%

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25% to 50%

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62% to 68%

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90%

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What helps to decrease the attraction for deposits on the SiHy lens

lower silicone content

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patient blinking instructions

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ductal plugs

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higher silicone content

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Which of these is a typical wetting agent

Hydroxyethylmethacrylate

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Formaldahyde

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Polyvinyl alcohol

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PSP

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What does surface treatment technology do

modifies the lens to ensure wearing suitability

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alter the patient blink rate

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increase thickness

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decrease thickness

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What is a hallmark of a tear friendly lens

dry eye syndrome

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canthal irritation

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protect lysozyme

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allow oxidation from UV exposure

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Which of these will reduce evaporation in the lens

UV treatment

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long-chain PVP

Correct Incorrect Correct answer

CoF

Correct Incorrect Correct answer

Mucin balls

Correct Incorrect Correct answer

Uniform dehydration, dehydration in a linear fashion and dehydration found on the entire lens are _________________:

levels

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properties

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stages

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CoF factors

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How soon can the accumulation of lipids on a lens begin

after several days

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within hours

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after a month approximately

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by the end of the day

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What is SEAL

silicone emphasis arcuate lipidemia

Correct Incorrect Correct answer

superior epithelial arcuate staining

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superior epithelial arcuate lesions

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simple elastic added latex

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Which statement is correct

Mucin balls always cause discomfort

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SEAL is not attributable to mechanical irritation

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a patient might be allergic to the lens material itself

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corneal erosion is caused by only one factor

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Contact lens wearers are ____________________________

all prone to infections

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12 times more likely to report dry eye symptoms

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unable to wear spectacles on an airplane

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allowed to sleep in all types of contact lenses

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What percentage of patients use measures to facilitate lens wear

approximately 50%

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only 26%

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about 90%

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less than 48%

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What is helpful for the patient who spends a good amount of time using a computer

a reduced blink rate

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a more rapid than normal blink rate

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the use of rewetting drops every 20 minutes

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the ability of SiHy to transmit oxygen independent of water content

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What is the source of epithelial stem cells

the stroma

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the limbal area

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the posterior chamber

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the aqueous

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If a lens is a daily disposable ______________________

it is thrown away at the end of the day

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it will always be hydrophobic

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then an enzyme cleaner must be used daily

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then the use of soaking is mandatory

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What do care solution manufacturers strive to achieve

extremely low cost

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optimal biocompatibility

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demulcent content only

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blinking restriction

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There is a correlation between _________________________

cost and comfort

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lens shape and blink rate

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blink rate and ionicity

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subjective comfort and friction

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What is not true regarding colored soft lenses

they were once limited to the hydrogel material

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they are now only available in dot-matrix form

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custom soft colored lenses are available

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colored lenses in the SiHy material are widely available

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What is the most common multifocal SiHy lens

a monthly replacement schedule lens

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daily disposable multifocal designs

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water gradient

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prism ballast

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What forms of customized, lathed SiHy lenses are available

only spheres

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only torics

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only tinted

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Rose K2 soft CL

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Which lens uses Hydraluxe as a proprietary technology

Air Optix Hydraglide PurVision Ultra Premio

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Johnson and Johnson Acuvue Vita

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MyDay

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Energys

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What is special about the Clariti brand

it is a planned replacement

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it employs prism ballast

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it has WetLoc technology

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it has a 38% water content

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Which of these tests will likely predict successful use of SiHy lenses

a good tear film test

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the Snellen test

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a demand periphery test

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a refraction

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What is correct about SiHy wearing schedules

they differ significantly from that of hydrogel lens wear

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SiHy is only approved for daily wear

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wearing schedules are essentially the same as for hydrogel lenses

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SiHy lenses are always worn overnight

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What is the primary cause of discontinued contact lens use

the use of expired solutions

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lens discomfort

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lack of patient motivation

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spouse critical of lens use

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What is true about patient compliance regarding SiHy lenses

patient compliance is no less important than with any contact lens

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patient compliance is not a factor when SiHy lenses are used

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patient compliance is good even when a patient stretches lens use time

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patient compliance is not problematic

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Which of these strategies is recommended for patient comfort

skip cleaning

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switch back to RPG

Correct Incorrect Correct answer

Switch to sleep-in lenses for lens deposits

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add rewetting drops for dry eye syndrome

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Which lens has a central RGP surrounded by a SiHy periphery

a multifocal lens

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a prism ballast lens

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the Duette

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the Rose K2

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