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Contact Lenses > Types & Materials > Flashcards

Types & Materials Flashcards

1
Q

General Types of Contact Lenses

A

Scleral
Rigid
Soft

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2
Q

Scleral Lenses:

Diameter

A

13mm to 25mm

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3
Q

Scleral Lenses:

Materials

A

PMMA (fenestration)
Silicone Acrylates
Flurosilicone Acrylates

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4
Q

Scleral Lenses:

Comfort

A

Excellent

Surface drying/deposits may reduce comfort

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5
Q

Scleral Lenses:

Vision

A

Excellent

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6
Q

Scleral Lenses:

Prescription Availability

A

+40D to -40D and prim

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7
Q

Scleral Lenses:

Advantages

A

Never lose them

No foreign bodies once inserted

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8
Q

Scleral Lenses:

Disadvantages

A

Insertion and removal uncomfortable
Chair time - lens dispense on going process
Reduced corneal sensitivity

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9
Q

Rigid Lenses:

Diameter

A

5mm-12mm

avrg 7.3mm to 9.8mm

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10
Q

Rigid Lenses:

Materials

A

Flurosilicone Acrylates

PMMA

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11
Q

Rigid Lenses:

Comfort

A

Initial - very poor
Lens felt on blink
(damaged, dry & scratched will reduce comfort)

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12
Q

Rigid Lenses:

Vision

A

Good VAs

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13
Q

Rigid Lenses:

Prescription Availability

A

+40D to -40D in 0.25 steps

2 Base DN prism

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14
Q

Rigid Lenses:

Advantages

A

Lots of oxygen
Better tear exchange
Accessible price

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15
Q

Rigid Lenses:

Disadvantages

A

Long adaption
Chair time
Easy to lose
Flare

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16
Q

Soft Contact Lenses:

Diameter

A

12mm-15mm

17
Q

Soft Contact Lenses:

Materials

A

Hydrogel

Silicon hydrogel

18
Q

Soft Contact Lenses:

Comfort

A

Good general comfort

Worse if dry, especially in high water content

19
Q

Soft Contact Lenses:

Vision

A

Pretty good

20
Q

Soft Contact Lenses:

Prescription Availability

A

Max +30D to -30D
Generic -12D to +8D
Cyl -6D

21
Q

Soft Contact Lenses:

Advantages

A

Great for infrequent use
Extended wear - material dependent
Cost

22
Q

Soft Contact Lenses:

Disadvantages

A

Prone to infections - absorbs
Restricted fitting ranges
Prone to deposits - but replaced

23
Q

Rigid Lens Materials (PMMA):

Advantages:

A

Good wetting
No deposits
Mechanically strong
Optically very good

24
Q

Rigid Lens Materials (PMMA):

Disadvantages:

A

Low oxygen supply

25
Q

Rigid Lens Materials (Silicone Acrylates):

Advantages:

A

Availability
Good oxygen supply
Dimensional stability
Stable vision

26
Q

Rigid Lens Materials (Silicone Acrylates):

Disadvantages:

A

Attracts deposits
3 and 9 o’clock staining
Poor wetting
Prone to breakage

27
Q

Rigid Lens Materials (Flurosilicone Acrylates):

Advantages:

A

Excellent oxygen supply
Possible in extended wear
Good wetting
Deposit resistant

28
Q

Rigid Lens Materials (Flurosilicone Acrylates):

Disadvantages:

A

Very prone to breakage
Corneal adhesion
Careful manufacture required

Contact Lenses (3 decks)

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