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Contact Lenses > Soft Contact Lens Properties > Flashcards

Soft Contact Lens Properties Flashcards

1
Q

What are optical properties?

A

Power

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2
Q

What are physical properties?

A

Equipment

Areas To Evaluate

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3
Q

What are areas to evaluate?

A 
Surface scratches
Lathe marks 
Material inclusions 
Air bubble defects
Identification marks
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4
Q

What are material properties?

A 
Water content
Modulus 
Wettability
Surface friction 
Oxygen permeability 
Refractive index 
Spectral and luminous transmittance
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5
Q

What material property is seeing how much water is in the contact lens?

A

Water content

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6
Q

What is the formula for water content?

A

(mhydrated-mdry)/(mhydrated)x100

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7
Q

What material property is the stiffness of the material?

A

Modulus

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8
Q

Are soft contact lenses more comfortable or easier to handle?

A

more comfortable

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9
Q

Are stiff contact lenses more comfortable or easier to handle?

A

easier to handle

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10
Q

Modulus :

Will the higher number be soft or stiff?

A

stiff

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11
Q

Will the lower number be soft or stiff?

A

soft

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12
Q

What refers to how easily a liquid spreads over the surface of contact lens?

A

Wettability

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13
Q

Does wettability increase as amount of water increase?

A

Yes

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14
Q

What material is hydrophobic and needs surface coating?

A

Silicone hydrogels

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15
Q

What impacts comfort of the lens when blinking?

A

Surface friction

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16
Q

How is surface friction measured?

A

Microtribometry

17
Q

What material property is how well oxygen passes through specific material?

A

Oxygen permeability

18
Q

What material property is how well oxygen passes through a contact lens with a specific material and thickness?

A

Oxygen transmissibility

19
Q

What measures refractive index of soft contact lenses?

A

Abbe refractometers

20
Q

What measures the % transmission of different wavelengths of light?

A

Spectrophotometer

21
Q

What are parts of the lens geometry?

A 
Diameter 
Sagittal depth 
Thickness
Radius of curvature
Edge appearance
22
Q

What are the 3 different measurements of radius of curvature?

A

Front optic zone
Back optic zone
Average base curve of back surface

23
Q

What are the edge designs?

A

Round
Knife
Chisel

24
Q

What are the edge defects?

A

Notch or chip

Tear or cut

Contact Lenses (18 decks)

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