Quiz For Soft Contact Lenses: Best Practices

One technique to evaluate the fit of a soft lens is

lens fluidity

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lack of movement

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reading chart

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visual acuity

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An optimal lens fit is:

marginally positioned

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not needing maintenance

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well centered

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adherent to the cornea

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_______________________ have a life span greater than 6 months and are usually replaced at intervals of no more than one year

conventional lenses

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frequent replacement lenses

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disposable lenses

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latex lenses

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These lenses are discarded after every use:

conventional lenses

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disposable lenses

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daily wear lenses

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sleep in lenses

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Low water content lenses __________________________

are no longer used

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are very hard to handle

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may mask low amounts of astigmatism

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only come in colored lenses

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Disposable lenses implies that a lens can be:

used continuously for 60 days

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worn for up to one year

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worn for up to three months

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discarded after use

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___________________ lenses can be worn for a maximum of 7 days or 6 nights

standard

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frequent replacement

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extended wear

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spherical only

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_________________ is the primary material used in many soft contact lenses

PMMA

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hydrogel

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silicone

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cellulose acetate butyrate

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Hydrogel material is classified as being:

hydrophobic

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hydrophilic

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gas permeable

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extended wear

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Hydrogel lenses are classified by the following two characteristics

hydrophobic and PMMA

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extended wear and daily wear

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ionic character and water content

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RGP and gas permeable

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These lenses require routine disinfection:

daily disposable

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extended wear disposable

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daily wear

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one day disposables

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One important ocular criterion to choose a type of soft lens for a patient is:

the patients budget

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a complete exam

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the reason for the appointment

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the patients previous experience with contact lenses

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The most important technique to be learned by the patient is:

lens removal

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lens rinsing

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the taco test

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cosmetic application

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The base curve of a lens is traditionally based upon:

the lens material

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the lens type

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the lens power

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the keratometric value of the central cornea

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Lens removal technique for soft lenses is

always taught before the exam

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only taught by the doctor

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to be mastered by the patient before the lenses can be taken home

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not necessary

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Hydrophilic lens base curves range from

8.5 to 8.8 mm

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9.5 to 10.3 mm

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8.0 to 9.2 mm

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7.5 to 8.3 mm

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The majority of soft lens fits will be successful using this base curve range:

8.5 to 8.8 mm

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9.5 to 10.3 mm

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8.0 to 9.2 mm

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7.5 to 8.0 mm

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Soft lens power is based upon

the manifest refraction plus compensation for vertex distance

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the power of the tear lens

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the lens material

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base curve selection

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Spherical equivalent can be calculated as:

half of the sphere added to the cylinder power

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a function of base curve only

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half of the cylinder added to the sphere power

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reducing the sphere by 0.25

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Which of these is a method of diagnostic lens fit

individual same lens

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bilateral spherical equivalent

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bilateral comparative lens

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individual equivalent

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In the ______________ method, a different lens design is placed on each eye and compared

bilateral

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individual

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bilateral comparative

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equivalent comparative

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Hydrophilic lens diameters range from:

7.0 to 10.5 mm

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13.8 to 14.5 mm

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12.5 to 16.0 mm

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10.0 to 11.0 mm

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_____________ defines the position of the hydrogel lens in relation to the corneal diameter

base curve

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lens coverage

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lens movement

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lens centration

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Primary gaze movement is measured ____________________________

after the lens has settle following each blink

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immediately prior to each blink

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after the patient looks right and left quickly

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just prior to a push-up test

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What is the most reliable test for determining the adequacy of the hydrogel lens fit

primary gaze

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lateral movement

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push-up

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vertical movement

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The overall soft lens fit can be considered as acceptable, if there is

partial corneal coverage with a reduced range of movement

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complete corneal coverage with an optimal range of lens movement

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adequate corneal coverage with excessive lens movement

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lens adherence

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When is the spherocylindrical over-refraction performed

the patient complains of redness

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the doctor comes into the office

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after lens equilibration

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after instilling eye drops

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Insertion and removal training is necessary

until the patient has proven he/she can successfully insert and remove the lenses

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only if the patient has worn lenses in the past

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only when fitting disposable lenses

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after the patient has worn the lenses for one month

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First-time soft contact lens wearers should

wear the lenses for up to 14 hours right away

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wear the lenses a maximum of 4 hours the first day

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use eye drops every hour

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wear the lenses a maximum of 8 hours the first day

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During the initial after care visit, the patient should:

read a new care pamphlet

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be switched to a new lens

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answer a new questionnaire

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be asked about their comfort level with lens insertion and removal

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In which original FDA classification group would you find low-water, non-ionic lenses

group one

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group two

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group three

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group four

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What is the material added so that a contact lens better mimics the body’s natural biological process

polymerization

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biomimesis

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stabilization

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sterilization

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Why would manufacturer add PVP to the matrix of a soft contact lens

better shape retention

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increased ionic cohesion

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increased water content

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increased thickness

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Will a patient ever wear two different brands of soft contact lenses

no, soft contact lenses are never prescribed in that fashion

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no, a patient could easily mix up the right for the left

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yes, a patient can demand anything he or she prefers

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yes, due patient needs, a doctor may prescribe two different brands, one for each eye

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A patients spectacle Rx is – 5.00 d.s. ou. What is correct regarding contact lenses for this patient

the contact lenses will be the same

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the contact lenses will be slightly weaker

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the contact lenses will be slightly stronger

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this patient should not have contact lenses

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Your patient asks to purchase some Halloween design contact lenses but does not have a prescription. The correct action is

order the lenses since they are just plano power

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order the lenses but do not dispense them until the patient brings a prescription

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do not order the lenses under any circumstances

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have the patient return with a written prescription and the order the lenses

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A soft contact lens label should include which parameter

the base curve

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whether it is a right or left lens

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the ingredients of the soaking solution it was shipped in

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the lens edge thickness

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A prospective patient brings in vials of the lenses currently being worn. Can you refill based on the vials

yes, just order the same brand

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yes, just choose any brand with the same water content

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no, the patient needs to have a current prescription for any contact lenses

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no, the patient can simply buy them at the pharmacy

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What is needed during a typical contact lens fitting

a reading test

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current blood pressure

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a Schirmer test

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a test for diabetes

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Can the pH of a soft contact lens change

no, it is set into the plastic matrix

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yes, lens solution and the patients own tear can change it

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pH is never measured for the eye or the tears

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pH is not considered at all in contact lens wear

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Quiz For Soft Contact Lenses: Best Practices

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