Scratch Resistant Coatings

Question 1

_ is benchmark material for abrasion resistance and optics

Answer 1

crown glass

Question 2

scratched lenses have diminshed _

Answer 2

impact resistance

Question 3

all non-glass materials are coated with SRC except _

Answer 3

CR-39 (naturally hard)

Question 4

coated stock lenses are coated on which side(s)?

Answer 4

both sides

Question 5

semifinished lenses are coated on which side(s)?

Answer 5

front surface only

Question 6

SRCs are applied where? (2)

Answer 6

lens manufacturer

optical lab

Question 7

if lens is AR coated, _ quality is essential to the success of AR

Answer 7

SRC

Question 8

2 ways to apple SRC? (2)

Answer 8

thermally cured, UV cured

Question 9

Thermally cured hard coatings are _ and removed _
For how long?
Commonly used by _

Answer 9

dipped; at consistent rate to control thickness
hours
manufacturers

Question 10

UV cured hard coatings are applied how?
Cured for how long?
Commonly used by?

Answer 10

while it spins
seconds
labs

Question 11

the type of material for SRC depends on whether or not _

Answer 11

the lens is to be tinted (difference between SRC and “hard coat”)

Question 12

SRC = _$

hard coat= _$

Answer 12

20 (tintable)

40 (not-tintable)

Question 13

although SRC are not designed to reduce lens reflections, they do exhibit some reduction in surface reflections
uncoated CR-39 transmits _%
SRC transmits _%

Answer 13

92

96

Question 14

_ cannot accept tints

_ is part of lens that allows for tinting to occur

Answer 14

polycarbonate

SRC!!

Question 15

SRC lenses should not be exposed to head, max _ degrees

- _ is preferred for making adjustments

Answer 15

200

air units

Question 16

damage to a coating from heat may not appear _

Answer 16

immediately

Question 17

we must instruct patients how to _ at point of sale

Answer 17

clean their lenses

Question 18

cleaning lenses should never be done _

Answer 18

dry

Question 19

warranty on coated lenses?

Answer 19

1 year