FITTING SiHy CL

Question 1

Prime motivation for developing silicone-based Ot materials

Answer 1

O2 permeability (Dk)

Question 2

why is SiHy better thatn hydrogel

Answer 2

Better oxygen permeability
increase CL transmissibility = increase corneal oxygenation
eliminate adverse outcomes of CL wear

Question 3

year when SiHy was discovererd

Answer 3

1998

Question 4

Extended wear is prone to

Answer 4

hypoxia

Question 5

Pervaporation staining thwarted use of obvious combination which are

Answer 5

high water and low transmissibility

Question 6

Higher water content, more

Answer 6

permeable

Question 7

elastomer

Answer 7

flexible

Question 8

acrylate

Answer 8

plastic

Question 9

when was polysiloxane hydrogels are patented

Answer 9

Jan 1979

Question 10

WHEN

SiHy CL patent issued to tanaka of TOYO CL COMPANY

Answer 10

FEB 1979

Question 11

WHAT YEAR

B&L released PureVIsion: balafilcon A - based on Tanaka’s and Kunzler & Ozark’s earlier work

Answer 11

1998

Question 12

WHAT YEAR
GALYFICON A

Answer 12

2003

Question 13

WHAT YEAR

SENOFILCON A

Answer 13

2005

Question 14

FIRST GENERATION SIHY

Answer 14

Focus night and day
Purevision

Question 15

SECOND GENERATION SIHY

Answer 15

Acuvue Advance
PureVIsion 2 HD
Acuvue Oasys
O2OPtic/AirOptix

Question 16

THIRD GEN SIHY

Answer 16

Biofinity
PremiO
Avaira

Question 17

T OR F

SIHY IS MORE PRONE TO PROTEIN DEPOSIT THAN LIPID

Answer 17

F

SIHY IS MORE PRONE TO LIPID THAN PROTEIN

Question 18

WHAT IS LCP

Answer 18

LENS CARE PRODUCT

Question 19

T OR F

HYDROGEL HYPOXIA RELATED CONDITIONS ARE SIGNIFICANTLY LOWER THAN SIHY

Answer 19

F

SIHY SIGNIFICANTLY LOWER

Question 20

WHICH IS MORE DIFFICULT TO MANUFACTURE

SIHY OR HYDROGEL?

Answer 20

SIHY

Question 21

ability of water to move through CL material - required for on-eye lens movement & ocular health

Answer 21

HYDRAULIC PERMEABILITY

Question 22

T/F

hydrogels have hydraulic permeability. SiHy CLs do not

Answer 22

T

Question 23

T/F

SiHy lenses inherently < wettable due to hydrophobic lens surface

Answer 23

T

Question 24

WHICH MANUFACTURING TECHNIQUE IS NOT USED WITH CURRENT SIHY CL

Answer 24

SPIN CASTING

Question 25

T/F

DRYNESS SENSATION IS LESS OF A PROBLEM WITH SIHY CLS

Answer 25

T

Question 26

SIHY CLS ARE UITED TO ALL MODES OF WEAR WHICH ARE

Answer 26

DD
DW
FW
EW
CW

Question 27

CHEMISTRY OF SIHY CLS

Answer 27

polyDiMethylSiloxane (pDMS)
DiMethylAcrylAmide (DMAA)
Tris(trimethylsiloxysilyl)PropylVinyl Carbamate
N-CarboxyVinyl Ester
Poly(dimethylsiloxy) di(silylbutanol) Bis(Vinyl Carbamate) (PBVC)
Propenyl group