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More ABO Stuff > Stuff I Can’t Get Right > Flashcards

Stuff I Can’t Get Right Flashcards

1
Q

Titanium frames

A

Advantages: Hypoallergenic, lightweight, corrosion-proof, strong
Disadvantages: not easy to manufacture, can be labeled titanium while containing other metals

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2
Q

ANSI Z87.1 -2003
High Impact

A
  • No less than 2mm thick at thinnest point
  • 1/4” steel ball shot at lens at 150’/s
  • Sandblasted
  • Poly or Trivex
  • Etched temple
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3
Q

Vitreous Chamber

A

Between retina and lens
Filled with vitreous humor

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4
Q

ANSI Z87.1 -2003
Basic Lenses

A
  • 3.0mm thick (>+3.00: 2.5mm)
  • 1” steel ball dropped 50”
  • Sandblasted
  • Must have warning label
  • Etching on temple
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5
Q

1.7X High Index

A

1.70 ABBE: 36
1.74 ABBE: 33
Pros: Thickness
Cons: Cost, ABBE value
Must have AR

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6
Q

Posterior Chamber

A

Between the iris and lens
Contains aqueous humor

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7
Q

Macula

A

Small, sensitive area of the central retina, providing vision for fine work and reading

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8
Q

Anterior Chamber

A

Between the cornea and iris
Contains aqueous humor

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9
Q

Layers/Tunics of the Eye

A

1- Fibrous tunic (sclera and cornea)
2- Vascular tunic (iris, choroid, ciliary body; nourishment)
3- Nervous/Neural tunic (inner layer of photoreceptors and neurons; consists of retina)

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10
Q

Trivex

A

N=1.53
ABBE: 43-45
Pros: mid to high RX, coatings and tints, replaces poly, good/great optics
Cons: thickness rivals plastic

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11
Q

Papilla

A

Small bump where the optic nerve exits the eye

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12
Q

Memory Metals

A

Pros: Bend instead of break, return to original shape, spring-like quality, lightweight
Cons: Poorly designed, impossible to adjust, bad for asymmetrical faces

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13
Q

Medial Rectus

A

-Rotates eye towards nose
-Attaches to the eye and runs straight back

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14
Q

Polyamide

A

-Nylon
-Lightweight
-Chemical resistant
-High UV resistance
-Don’t use heat

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15
Q

Glass

A

N=1.53
ABBE: 58
Pros: scratch resistance, optics, coatings, chemical resistance
Cons: weight, safety, availability, processing time

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16
Q

Superior Rectus

A

Eye looks up
Attaches directly to eye and runs straight back

17
Q

Polycarbonate

A

N=1.586
ABBE: 31
Pros: safety, availability, weight, high sph rx, good for children and people w/ one eye
Cons: coatings and tints, high cyl rx, ABBE value

18
Q

Superior Oblique

A

Eye rolls, looks down, to the side
Attaches under superior rectus but follows same path

19
Q

Keratoconus

A

Degenerative corneal disease where the center of the cornea becomes conical in shape

20
Q

Fovea

A

Depression in the retina that contains only cones and provides acute eyesight

21
Q

Optyl

A

Memory plastic
Can be adjusted with heat and holds shape when cooled

22
Q

Aphakia

A

Condition of the eye with the crystalline lens removed or missing due to trauma

23
Q

Aphakic Lens

A

Lens worn after cataract surgery when an intraocular implant is not put into the eye after removal

24
Q

Base In/Base Out Prism

A

Patient may describe objects as being tilted

25
Q

Limbus

A

Where the cornea and sclera join

26
Q

Plastic

A

N= 1.49/1.50
ABBE: 58
Pros: cost, optics, coating and tints, basic rx
Cons: thickness, weight, will break if cracked or drilled

27
Q

Low Power Aspheric Lens

A

All aspheric lenses not specifically designed for post-cataract use

28
Q

Vogel’s Rule

A

Plus lens
- BC= spherical equivalent +6.00D

Minus lens
- BC= half spherical equivalent +6.00D

29
Q

Vertex Distance

A

Distometer
From front of cornea to back of lens
Plus lens
- towards eye loses, away from eye gains
Minus lens
- towards eye gain, away from eye loses

30
Q

1.6X High Index

A

ABBE: 36-42
Pros: high rx, coatings, optics
Cons: cost, inconsistent tinting, some labs won’t drill
AR

31
Q

Light

A

Form of radiant energy
186,000m/s

32
Q

Monel

A

Nickel based
Pros: easy to adjust, hold adjustments, strong, lightweight, wide range of colors, economical, solder
Cons: plating can wear off, prone to breaking, erodes quickly, heaviest of metal frames

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