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CL > Radiuscope > Flashcards

Radiuscope Flashcards

0
Q

Name 2 stabilization techniques:

A

Truncation and prism ballast

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1
Q

Translating Design, aka:

A

Segmented or Alternating design

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2
Q

Truncation: usually remove ___mm to ___mm from the ____ edge of the lens

A

0.5-1.5

Lower

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3
Q

Name 2 advantages of a truncation:

A
  • Good stability

- Easily observed and measured on an eye

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4
Q

Disadvantages of truncation:

A
  • Less comfortable
  • Cosmetically more noticeable
  • Less satisfactory with oblique cylinders
  • Increased deposits along truncation edge
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5
Q

(True or false) Prism ballast stabilization technique usually employs 1-3 prism diopters base down.

A

False.

Usually employs 1-1.5 prism diopters base down.

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6
Q

Advantages of prism ballast?

A
  • more comfortable
  • better with oblique cylinders
  • cosmetically less noticeable
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7
Q

Name 2 disadvantages of prism ballast stabilization techniques:

A
  • careful slit lamp evaluation required to assess lens rotation
  • lenses are thicker, no uniform distribution on oxygen (therefore always watch for some form of stippling).
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8
Q

Simultaneous vision designs are:

A

Concentric and aspheric

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9
Q

The only type of multifocal contact lens that can be described as “progressive” is?

A

Aspheric design

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10
Q

Marco/Nidek start at the____ moving tray ______ until you find the 1st image, this is the _____ image.

A

Top
Downwards
Real

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11
Q

Marco/Nidek you zero at the ____ image

A

Real

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12
Q

Marco/Nidek you read BCOR at final image which is the ____ image

A

Aerial

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13
Q

If you move the stage, the aerial image will do what?

A

Move around

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14
Q

If you move the stage, the real image will do what?

A

remain in 1 place

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15
Q

Neitz/Amtek start at the____ moving tray ______ until you find the 1st image, this is the _____ image.

A

Bottom
Upwards
Aerial

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16
Q

Neitz/Amtek you zero at the ____ image

A

Aerial

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17
Q

Neitz/Amtek you read BCOR at final image which is the ____ image

A

Real

18
Q

Why would you fit a high + RGP which is lenticulated with a - carrier?____
And what does is do to the edge of the lens?____
The flatter the carrier, the ____ it will position on the eye.

A

It thickens the lens
It thickens
Higher

19
Q

Ortho-k and reverse geometry lens, BCOR____ (flatter or steeper) and peripheral curve____ (flatter or steeper).

A

BCOR flatter

PC steeper

20
Q

What do you call an unfinished RGP lens?

A

RGP button

21
Q

n__n
| 0 |
u—u

A

Intraocular soft contact lens

22
Q

Rx BOZR FOZR Toricity

cyl cyl sph ?

A

Back toric

23
Q

Rx BOZR FOZR Toricity

cyl cyl cyl ?

A

Bi-toric

24
Q

Rx BOZR FOZR Toricity

cyl sph cyl ?

A

Front-toric

25
Q

Rx BOZR FOZR Toricity

sph cyl

A

Mean back surface has been warped

26
Q

What is an x-chrom lens?

A

Red lens placed on non-dominant eye for red green colour blindness.

27
Q

CL with a black pupil on it?

A

For cosmetic lenses, CFlex 38 ciba vision

28
Q

Rigid lens with an attached skirt

A

Hybrid lens (better for keratoconus than piggy back)

29
Q

Soft lens with RGP riding on top of it?

A

Piggy-back lens

30
Q

What is flatter: PC or BC?

A

Peripheral curve is flatter than your BC

31
Q

What lenses are adjusted on velvetine pads ?

A

Concentric lenses

32
Q

With a flat sponge or toe pad, how do you add - power?

A

Removing plastic from the center of lens

33
Q

With a flat sponge or toe pad, how do you add + power?

A

Removing plastic from the periphery of lens

34
Q

Name of device that holds the lens during modification?

A

Green suction cup/spinners/greenies/lens holders

35
Q

How much power can safely be added to a lens without distortion?

A

-0.12 to -0.50D

+0.12 to +0.37D

36
Q

On average, how long does it take to make the modification?

A

5-10 minutes

37
Q

What modification procedures can be done in office?

A
  • diameter reduction
  • peripheral curve adjustments
  • power adjustments
  • edge shaping
  • polishing
38
Q

Diameter and PC modifications are performed in the adjustment bucket with what solution?

A

Water

39
Q

The V-stone is used for which mod?

A

Reducing diameter

40
Q

What do you call the tools to polish the hard lenses after diam and PC mods?

A

Velvetine pads

41
Q

What solution do you use with the tools you use to polish hard lenses after diam and PC mods?

A

(Tools= velvetine pads)

X-pal or boston lens solution

42
Q

Order of modifications

A
  1. Diameter reduction
  2. Peripheral curve adjustment
  3. Edge profile changes/shaping
  4. Polishing
  5. Power adjustments

CL (4 decks)

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