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CL 3 Final > Review of CL I and II > Flashcards

Review of CL I and II Flashcards

1
Q

Which type of optics has a varying curvature across the surface of the lens to counter spherical aberration

A

Aspheric optics

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2
Q

What are the 2 types of BCL?

A

acuvue oasys, air optix night and day

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3
Q

What must the power of the lens be to be considered a true BCL?

A

plano

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4
Q

is the Dk of SiHy >/< Hydrogel?

A

SiHy > Hydrogel

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5
Q

Since SiHy has a higher Dk, what type of lenses is it used in?

A

extended wear lenses

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6
Q

What happens to the following properties of a hydrogel contact when water content is increased?
* durability
* Dk
* deposit formation
* dry eye symptoms

A

All increase except for durability

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7
Q

What happens to the Dk of a SiHy contact when the water content is increased?

A

decreases; silicone content is what increases the oxygen permeability

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8
Q

A low/high modulus resists deformation, holds shape better, is easier to handle and provides better visual acuity

A

high

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9
Q

Does a low or high modulus lens experience more edge lift, fluting, superior epithelial arcuate lesions, mucin balls, GPC?

A

high modulus

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10
Q

How do we determine the diameter of a SCL?

A

HVID + 2

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11
Q

What happens to the sag height of a SCL as the diameter increases assuming a fixed base curve radius?

A

increases

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12
Q

Which BC do we start with when fitting SCL if there is more than one available?

A

steep

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13
Q

Is LARS calculated from the patient or doctors perspective?

A

doctor’s perspective

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14
Q

Fill in the blanks

A

A. Spherical RGP
B. Front Toric RGP
C. Back Toric RGP
D. Bitoric RGP
E. SPE Bitoric
F. CPE Bitoric

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15
Q

A GP lens moves along the direction of most/least resistance

A

least

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16
Q

Where is the GP lens the loosest?

A

Where the cornea is the steepest

17
Q

How much movement is normal in a GP lens?

A

1.0-1.5 mm

18
Q

How do you increase edge lift of a GP lens?

A

increase PC width (must narrow OZD or increase OAD)

19
Q

For every _____ mm change in BC, you must change the power by ______ D

A

0.10 mm; 0.50 D

20
Q

What are the clinically meaningful parameter change values for BCR, OAD/ OZD, PCR, PCW and CT?

A
  • BCR: 0.1 mm (0.50 D)
  • OAD/ OZD: 0.3 mm
  • PCR: 0.5 mm
  • PCW: 0.2 mm
  • CT: 0.02 mm
21
Q

How is SPE bitoric special in regards to rotation?

A

Vision is unaffected by rotation of the lens on the eye; acts like a spherical lens- can rotate while centered

22
Q

When does residual astigmatism occur?

A

When refractive astigmatism does not equal corneal astigmatism

23
Q

What is unique about writing the prescription for a back toric GP?

A

Only have to specify power in the most plus meridian

24
Q

When might you need toric peripheral curves?

A

When edge lift is not equal but it is symmetric

25
Q

How is a front toric GP stabilized?

A

BD prism (0.75-2.00 BD); can truncate if a slight adjustment is all that’s needed

26
Q

What Dk do you order if prism is added?

A

higher Dk

27
Q

What does simultaneous aspheric mean in regards to multifocal contacts?

A

change in power from center to periphery; SCL: center near or center distance; GP: mainly center distance

28
Q

Who are the best candidates for aspheric GP’s?

A

low lower lid (and/or loose lids); smaller- average pupil size; low-medium adds; critical vision not essential; computer; athletes

29
Q

Which aspect of fit is critical when fitting aspheric GP’s?

A

centration; optics should be over the pupil

30
Q

What should be modified if the aspheric GP is decentered or moves excessively?

A

steepen base curve (0.10 mm); or increase lens diameter (0.50 mm)

31
Q

Which type of GPs are segmented like bifocal glasses and use prism ballasting to promote proper orientation?

A

translating

32
Q

Where should a translating GP rest in primary gaze?

A

on or near the lower lid

33
Q

What amount of nasal rotation may be helpful for reading?

A

<15 degrees

34
Q

Where is the segment line on a translating GP?

A

at or near lower pupil margin

CL 3 Final (8 decks)

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