Quiz For Astigmatism and Contact Lenses

________________astigmatism cannot be corrected by spectacle lenses

irregular

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regular

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with the rule

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against the rule

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In ____________astigmatism the cornea is steeper in the vertical meridian and flatter in the horizontal

with the rule

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against the rule

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regular

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irregular

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In ____________astigmatism the cornea is steeper in the horizontal meridian and flatter in the vertical.

with the rule

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against the rule

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regular

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irregular

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In simple myopic astigmatism

one point of light comes to focus on the retina and one point comes to focus in front of the retina

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one point comes to focus on the retina and one point comes to focus behind the retina

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both points of light come to focus in front of the retina

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both points of light come to focus behind the retina

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In simple hyperopic astigmatism

one point of light comes to focus on the retina and one point comes to focus in front of the retina

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one point comes to focus on the retina and one point comes to focus behind the retina

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both points of light come to focus in front of the retina

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both points of light come to focus behind the retina

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In compound myopic astigmatism

one point of light comes to focus on the retina and one point comes to focus in front of the retina

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one point comes to focus on the retina and one point comes to focus behind the retina

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both points of light come to focus in front of the retina

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both points of light come to focus behind the retina

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In compound hyperopic astigmatism

one point of light comes to focus on the retina and one point comes to focus in front of the retina

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one point comes to focus on the retina and one point comes to focus behind the retina

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both points of light come to focus in front of the retina

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both points of light come to focus behind the retina

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In mixed astigmatism

one point of light comes to focus on the retina and one point comes to focus in front of the retina

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one point comes to focus in front of the retina and one point comes to focus behind the retina

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one point of light comes to focus behind the retina while the other comes to focus on the retina

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both points of light come to focus behind the retina

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When are bitoric lenses prescribed

when there is at least 1.50 D of corneal astigmatism accompanied by a significant amount of residual astigmatism

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only for bifocal contact lenses

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when there is no corneal astigmatism

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only when there is a small amount of corneal astigmatism and no residual astigmatism

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For which of the following could prism ballast be used

for all aspherics

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for all spherical lenses

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for all soft lenses

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for some bifocals

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Using the Rx below – A rigid contact lens fit “on K” would require which of the following powers? Rx – 3.50 + 1.25 x 90 K: 42.00 x 180/43.75 x 90

– 2.25 D

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– 2.50 D

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– 2.75 D

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– 3.00 D

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The power of the tear lens in the previous questions is

plano

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+ 0.50

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– 0.50

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none of the above

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Rx – 2.25 – 0.25 x 180 What is the power of a rigid contact lens fit 0.75 diopters steeper than K?

– 2.25 D

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– 2.50 D

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– 2.75 D

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– 3.00 D

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The power and thickness of the lacrimal lens will vary with the

refraction

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lens-cornea relationship

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"K" readings

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lens thickness

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The rotation of a toric contact lens may be inhibited by

using PMMA material

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using RGP material

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changing the vertex distance

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using a truncated lens

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When a lens is ___________a portion of it is sectioned off

made with a steeper base curve

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made with a flatter base curve

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truncated

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fenstrated

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The expression LARS stands for:

left add, right subtract

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a famous Swedish contact lens fitter

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long adds remain safe

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left adjust, remaining seal-off

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Astigmatic contact lenses may be classified into the following categories

dual toric

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multiple toric

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triple toric

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bitoric

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________maintain their shape on the eye and don’t conform to the unequal contours of an astigmatic cornea

RGP lenses

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toric soft lenses

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spherical soft lenses

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hydrogel lenses

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The tear lens behind the RGP contact lens

is not affected by lens rotation

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is greatly affected by lens rotation

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does not help correct for corneal astigmatism

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can correct for residual astigmatism

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Residual astigmatism may be caused by

a spherical cornea

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a spherical crystalline lens

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a dirty lens

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atoric posterior corneal surface

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Anterior toric contact lenses with spherical back surfaces

are typically fit when there is a significant amount of residual astigmatism

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are typically fit when there is no residual astigmatism

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are available in RGP lenses only

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are available in soft lenses only

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Posterior base curve toric lenses

are only used for hard lenses

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are only used for soft lenses

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are used when there is 0.25 D of corneal astigmatism

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are used when there is at least 1.50 D of corneal astigmatism

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When a rigid lens is fit on K the tear lens

has no power

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has cylinder power

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has plus power

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has minus power

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When a rigid lens is fit steeper than K, the tear lens

has no power

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has plus power

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has minus power

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has plano power

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When a rigid lens is fit flatter than K, the tear lens

has no power

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has plus power

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has minus power

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has plano power

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Astigmatism is

only correctable with LASIK

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not correctable through the use of eyeglasses

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only correctable through the use of contact lenses

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a common refractive error

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____________is used for the correction of astigmatism

cylinder

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prism

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slab-off

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peripheral curves

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__________astigmatism can be caused by a diseased or damaged cornea

regular

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irregular

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residual

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corneal

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Axis is always recorded as angle in degrees between ______and ______degrees

180 and 270

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90 and 270

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0 and 180

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0 and 270

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The normal cornea is essentially spherical in shape, and it

has two focal points

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refracts light evenly in all directions

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is shaped like a football

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steepens at the periphery

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Refractive surgeries require

healthy eyes that are free from retinal problems

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patients who are over the age of 40

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spectacles

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the same treatment for all patients

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Which of the following is not a sign or symptom of keratoconus

thinning of the corneal apex of ≥ 1.00 mm

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corneal opacities

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thickening of the corneal apex of ≥ 1.00 mm

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Munson’s sign

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The keratometer measurement can be extended to what range

36.00 to 52.00 diopters

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53.00 to 61.00 diopters

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there is no set range

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the keratometer range cannot be extended

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Toric contact lenses may be indicated when

spherical lenses did not provide sufficient optical correction

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the patient has low amounts of astigmatism

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when the patient normally wears bifocal spectacles

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a spherical lens provided sufficient optical correction

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Every toric lens will

stabilize after 20 minutes

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rotate, even if just a small amount

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cause ocular irritation

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not return to correct axis orientation

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What attachment to the slit lamp can measure lens rotation

a topogometer

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a slide rule

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a protractor

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a LARS attachment

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An aspheric back surface lens can aid in stabilization by

adding drag to the motion of the lens

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toric lenses never have aspheric back surfaces

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utilizing lower lid attachment

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rotating freely

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Which of these is a benefit of a toric contact lens

poorer vision when compared to a spherical equivalent lens

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poor durability

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poor correction of astigmatic problems

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better correction of higher amounts of astigmatism

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When is it beneficial to wear spectacles over contact lenses

to ride roller coasters

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if the patient wants to use sunglasses

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when the patient wears spherical contact lenses, but needs full correction for specific tasks

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if the dispensary does not have the correct contact lens in stock

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