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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

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 ?

24
Rx BOZR FOZR Toricity | cyl sph cyl ?
Front-toric
25
Rx BOZR FOZR Toricity | sph cyl
Mean back surface has been warped
26
What is an x-chrom lens?
Red lens placed on non-dominant eye for red green colour blindness.
27
CL with a black pupil on it?
For cosmetic lenses, CFlex 38 ciba vision
28
Rigid lens with an attached skirt
Hybrid lens (better for keratoconus than piggy back)
29
Soft lens with RGP riding on top of it?
Piggy-back lens
30
What is flatter: PC or BC?
Peripheral curve is flatter than your BC
31
What lenses are adjusted on velvetine pads ?
Concentric lenses
32
With a flat sponge or toe pad, how do you add - power?
Removing plastic from the center of lens
33
With a flat sponge or toe pad, how do you add + power?
Removing plastic from the periphery of lens
34
Name of device that holds the lens during modification?
Green suction cup/spinners/greenies/lens holders
35
How much power can safely be added to a lens without distortion?
-0.12 to -0.50D | +0.12 to +0.37D
36
On average, how long does it take to make the modification?
5-10 minutes
37
What modification procedures can be done in office?
- diameter reduction - peripheral curve adjustments - power adjustments - edge shaping - polishing
38
Diameter and PC modifications are performed in the adjustment bucket with what solution?
Water
39
The V-stone is used for which mod?
Reducing diameter
40
What do you call the tools to polish the hard lenses after diam and PC mods?
Velvetine pads
41
What solution do you use with the tools you use to polish hard lenses after diam and PC mods?
(Tools= velvetine pads) | X-pal or boston lens solution
42
Order of modifications
1. Diameter reduction 2. Peripheral curve adjustment 3. Edge profile changes/shaping 4. Polishing 5. Power adjustments

CL (4 decks)

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