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OPT 2500 ( FULL OVERVIEW ) > UNIT FOUR - CL Characteristics/Manufacturing > Flashcards

UNIT FOUR - CL Characteristics/Manufacturing Flashcards

1
Q 
LENS CHARACTERISTICS:
Oxygen permeability (DK Value)
A 
D= diffusion coefficient for oxygen movement in the lens material 
K= solubility of oxygen in the material
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2
Q 
LENS CHARACTERISTICS:
Oxygen transmissibility (DK/L)
A 
D= diffusion coefficient for oxygen movement in the lens material 
K= solubility of oxygen in the material
L= lens thickness
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3
Q

LENS CHARACTERISTICS:

Wettability

A

Wetting angle

Functional wettability

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4
Q

LENS CHARACTERISTICS:

Heat transfer

A

………..

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5
Q

LENS CHARACTERISTICS:

Stability

A

Flexure

Warpage

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6
Q

LENS CHARACTERISTICS:

Durability

A

…………..

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7
Q

LENS CHARACTERISTICS:

Deposit resistance

A

………………

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8
Q

LENS CHARACTERISTICS:

Electrostatic properties

A

Ionic

Non-ionic

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9
Q

LENS CHARACTERISTICS:

Reproducibility

A

……………

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10
Q

Rigid lens materials (4 total)

A

Polymethylmethacrylate (PMMA)
Cellulose Acetate Butyrate (CAB)
Silicone Acrylate (SA)
Fluoride-Silicone Acrylate (FSA)

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11
Q

Rigid lens designs (6 designs)

A 
Spherical
Front surface toric
Back surface toric
Bitoric
Aspheric
Cosmetic
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12
Q

RIGID LENS MANUFACTURING:

Lathe cut

A 
Liquid monomers
Polymerization using heat & UV light
Base curve
Peripheral curves
Anterior curves
Edge
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13
Q

RIGID LENS MANUFACTURING:

Cast molded

A

Base curve

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14
Q

Soft lens materials (3 materials )

A

Hydroxyethylmethacrylate (HEMA)
Glyceryl Methylmethacrylate (GMMA)
Silicone Hydrogel

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15
Q

Soft lens designs ( 7 total)

A 
Spherical
Front surface toric
Back surface toric
Bitoric
Aspheric
Cosmetic
Therapeutic
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16
Q

SOFT LENS MANUFACTURING:

Lathe cut

A 
Liquid monomers
Polymerization using heat & UV light
Base curve
Peripheral curves
Anterior curves
Edge
Hydration
Extraction (rinsing)
Inspection
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17
Q

SOFT LENS MANUFACTURING:

Spin cast

A 
Liquid monomers 
Spinning molds of front surface 
Polymerization using heat&UV light
Edge
Hydration 
Extraction (rinsing)
Inspection
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18
Q

SOFT LENS MANUFACTURING:

Cast molding

A 
Liquid monomers
Concave&convex molds
Polmerization using heat&UV light
Edge
Hydration
Extraction (rinsing)
Inspection
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19
Q

Manufacturing concerns

A 
Lens design 
Material characteristics 
Production volume
Reproducibility 
Quality control
20
Q

Manufacturing costs

A

Research and development
Engineering and equipment
Materials
Labor

21
Q

Manufacturing methods (4 total)

A

Lathe cast
Spin cast
Spin cast/lathe cast
Cast molded

22
Q

Standard Lathe manufacturing process :

Posterior surface

A

Button mounting
Cutting central posterior curve
Polishing CPC or base curve
Generating secondary and peripheral curves

23
Q

CNC multi-Axis Lathe Manufacturing Process

A 
Computer entry 
Network capabilities 
Base and peripheral curves 
Aspheric curves 
Toric curves 
Edge design
24
Q

Cast Molded Radius buttons

A

Liquid monomer
Polymerization in molds
Buttons with finished base curve


25
Q

Standard lathe manufacturing:

Anterior surface

A

Blocking
Lathe anterior surface
Edging

26
Q

What are the three parts that are needed to be inspected?

A

Base curve and surface quality
Power
Edge

27
Q

During the inspection process, base curve and surface quality can be inspected by what?

A

Radiuscope

28
Q

During the inspection process,power can be inspected by what?

A

Lensometer or auto lensometer

29
Q

During the inspection process, edge can be inspected by?

A

Projection magnifier

30
Q

What are some of the soft lens additional Procedures?

A

Hydration, extraction, tinting, wet inspection, final packaging, sterilization, and labeling.

31
Q

What are some of the contact lens packagings?

A 
Vials(older design)
Blister packs (current)
32
Q

What are some advantages of lathe cutting ?

A

Design options
Material options
Low volume production

33
Q

What are some disadvantages of lathe cutting?

A

Labor costs
Material waste
Reproducibility

34
Q

What was the original manufacturing process of contact lenses ?

A

Spin cast

35
Q

What are the steps of the Spin cast manufacturing process?

A

1) Stainless steel tools form molds
2) Mold place in spinning cavities in lens production table
3) Liquid monomer is injected into spinning, computer controlled mold
4) Lens form solidifies under UV light
5) Edge is trimmed and rounded
6) lens hydrated and rinsed

36
Q

What are some advantages of Spin cast manufacturing?

A

Unit cost
Reproducibility
Comfort

37
Q

What are some disadvantages of Spin cast manufacturing?

A

Cost of initial set up

Visual acuity 

38
Q

What is the most popular method of manufacturing today ?

A

Cast molding

39
Q

What is the process for cast molded manufacturing?

A

1) stainless steel tools form convex and concave plastic injection molds
2) reusable quartz molds may be used
3) concave mold is filled with liquid monomer
4) convex mold is placed on top and clamped
5) polymerization occurs as lenses are exposed to heat and UV light 

40
Q

What are some of the additional processes for Cast molding ?

A

Hydration, rinsing, tinting, surface treatment, wet inspection, packaging, and labeling 

41
Q

What are additional names for cast molding ?

A

Fully molded, light stream molded, stabilized soft molded, and wet molded.

42
Q



A
43
Q

What are some cast molded lens designs and types?

A

Frequent replacement, disposable, spherical, toric, and multifocal.

44
Q

What are some advantages of cast molded manufacturing?

A

Lower unit cost
Surface quality
Reproducibility

45
Q

What are some disadvantages of cast molded manufacturing?

A

Initial set up costs
Limited parameters
Edge finish

OPT 2500 ( FULL OVERVIEW ) (7 decks)

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