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III. Advanced Contact Lenses > Soft Toric (M1) > Flashcards

Soft Toric (M1) Flashcards

1
Q

Who are the best candidates for soft torics?

A
  1. poor VA with spherical soft CL
  2. GPs difficult to fit or not tolerated
  3. high sphere vs cyl (around
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2
Q

What is the order of choosing parameters in selecting soft toric lenses?

A
  1. cyl axis
  2. cyl power
  3. sphere power
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3
Q

What are the different stabilization techniques for soft torics?

A
  1. prism
  2. truncation
  3. thin zones
  4. peri-ballast
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4
Q

If the soft toric lens is rotated clockwise, does the cyl axis increase or decrease? 1. What should be done? 2

A
  1. decrease

2. add amount rotated

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5
Q

What are the 1 day soft toric lenses that have a periballast design?

A
  1. softlens daily disposables for astigmatism

2. clariti 1 day toric

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6
Q

What does the corneal toricity and lenticular astigmatism lead to?

A

refractive astigmatism

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7
Q

If poor visual acuity is found with soft torics, what should be done?

A
  1. confirm rotational stability
  2. compensate for stable rotation
  3. spherical over-refraction
  4. spherocyclindrical over-refraction
  5. recheck baseline data
  6. new lens
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8
Q

What are the disadvantages of prism ballast soft torics?

A
  1. less O2 transmissibility
  2. discomfort lid-lens interact
  3. visual problems with unilateral
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9
Q

What type of soft toric soft lens has thinning at the top and bottom of lens?

A

thin zones

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10
Q

What is the average cornea topography value? 1. What is the range? 2

A
  1. 7.80mm (43.25D)

2. 7.00 (48.25D) to 9.50mm (35.50D)

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11
Q

What are the features of “blink stabilized” lenses?

A

thicker zones nasal and temporal

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12
Q

What type of soft toric lens has a minus carrier over the entire lens an then thin superiorly with no prism in optic zone?

A

peri-ballast

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13
Q

What are the 1 day soft toric lenses that have a thin design?

A
  1. dailies aqua comfort plus for astigmatism

2. 1 day acuvue moist for astigmatism

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14
Q

For every 10deg of axis misalignment, how much cyl is induced?

A

1/3 of cyl power (in wrong meridian though)

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15
Q

What are the major aspects that encompass the fit assessment of a soft toric?

A
  1. centration
  2. movement
  3. orientation
  4. rotation
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16
Q

What is the first soft toric lens ordered for the patient with a vertex Rx of -3.00-3.12x180?

A

-3.50-2.25x180 (-2.25 is max)

17
Q

If the soft toric lens is rotated counter-clockwise, does the cyl axis increase or decrease? 1. What should be done? 2

A
  1. increase

2. subtract amount rotated

18
Q

How do you know the issue with the soft toric is a problem with axis based on the over-refraction?

A

the spherical equivalent will be plano at a random axis (cyl)

19
Q

What is the amount of prism found in prism ballast? 1. What is the lens stabilized by? 2

A
  1. 0.75 to 2pd

2. thickness difference and weight (minimal)

20
Q

Where does the lens marking now sit after the change in axis is made due to a rotation?

A

same as before change

21
Q

When are soft torics most necessary?

A
  1. refractive astigmatism -0.75 or more

2. corneal toricity does NOT equal refractive astigmatism

22
Q

For a truncated soft toric lens, what does the truncation line up with?

A

lower lid

23
Q

What percentage of soft lenses are toric?

A

34%

24
Q

If a patients spec Rx has an axis of 85, what should the axis of the soft toric be? 1. For 15deg? 2

A
  1. 90

2. 10

25
Q

If the exact cylinder power is not available, what should be done?

A

select lower cyl power

26
Q

How long should a soft toric settle before analyzing?

A

15min

27
Q

What is the soft toric lens type that has the toricity on the back surface of the lens? 1. What type of patient is this good for? 2

A
  1. purevision for astigmatism (or ultra)

2. high corneal cyl patients

28
Q

Who are not good candidates for soft torics?

A
  1. cylinder greater than sphere

2. oblique cylinders

29
Q

What are the things that can lead to rotation of a soft toric?

A
  1. large diameters
  2. thickness differential of lens allows orientation
  3. blink forces
  4. “watermelon seed” effect
  5. gravity

III. Advanced Contact Lenses (16 decks)

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