Grooving/ Tinting

Question 1

What are the 3 main steps to grooving a polycarbonate lens?

Answer 1

1)Groove the lens dry.
2)Leave only a little depth ungrooved.
3)Last pass = groove the lens wet so it looks less frosted and more polished.

Question 2

How is dye prepared?2

Answer 2

-Clean tank of leftover residue
-use distilled or deionized water.

Question 3

What 2 things make up the lens layout process?

Answer 3

Spotting and Centration

Question 4

What are the two ways glass can be hardened?

Answer 4

Heat tempering
Chemical tempering

Question 5

What is heat tempering/hardening?

Answer 5

Lens go in kiln for 2 to 3 minutes then get removed and cooled rapidly with forced air.

Question 6

What is chemical tempering?

Answer 6

Sumbersed in salt, smaller ions are replaced with larger ones on the surface. Crowds the lens surface which squeezes the surface tension.

Question 7

How do you start a new batch of dye? 5 steps

Answer 7

1) fill tank half full and bring to 140 oF
2)shake bottle well
3)pour dye into the tank
4)pour water into the bottle, shake, pour rest into tank x3
5)fill the tank with distilled water

Question 8

What 3 things determine the life span of the dye?

Answer 8

-How long the dye has been mixed with water.
-How hot has the dye temperature been.
-How many lenses have been tinted.

Question 9

What is a lens groover? 2

Answer 9

-machine used to cut into the edge of a lens
-most common method

Question 10

What is a solid tint? 2

Answer 10

-same color all over the lens
-same light tranmission

Question 11

What is a gradient tint? 3

Answer 11

-Vary in transmisson over the surface
-typically top to bottom
-fashion tint

Question 12

what is a double gradient tint style?

Answer 12

lenses created with one color on the top, and another on the bottom which fade into one another

Question 13

What is a triple gradient?

Answer 13

1 gradient in the upper half, a 2nd reverse gradient in the lower half and a 3rd color in the center.

Question 14

What is UV dyeing?

Answer 14

Process of applying a treatment to a lens to acheive a certain level of UV protection.

Question 15

What can sunglasses do that are sufficiently dark?

Answer 15

May reduce the transmission of visible light

Question 16

What does a UV tint do for the eye? 2

Answer 16

-Makes the eye more comfrtable on bright days
-preserves the eye’s ability to fully and rapidly adapt to the dark at night.

Question 17

What are the 3 ways we can tint a lens?

Answer 17

1- add a color substance into lens material before it becomes a lens
2-vacuum coating the color onto the surface of the lens
3-immersing the lens in a liquid dye so dye is absorbed

Question 18

If a tint is spotty/ has circle like variations what is the problem?

Answer 18

the lens is cured unevenly

Question 19

why are the colours off when dying a lens? 2

Answer 19

-Minerals or contaminations are in the dye water
-Someone keeps using hard tap water, and not distilled water

Question 20

why does the lens appear blotchy after dying? 2

Answer 20

-The lens was not properly cleaned
-The lens cured unevenly during manufacturing

Question 21

Why should a lens be dyed after edging?

Answer 21

so it dyes the edges as well makes it more cosmetically appealing.

Question 22

How is tint removed with neutralizer?

Answer 22

tint is removed by placing them in solution of lens neutralizer-bleaching some tints

Question 23

why should you not replace one tint at a time?

Answer 23

will be incredible hard to get it to match

Question 24

how would you balance lens color on a lens?

Answer 24

add one of the 3 primary colors to help shift the color

Question 25

what is the purpose of a light box?

Answer 25

compare the colors of lenses

Question 26

what happens to a tint when it is exposed to sunlight and fluorescent light?

Answer 26

continually exposure can lighten tint after 12-18 months.
if kept in a drawer tint can last 5 years.

Question 27

What is lens curing?3

Answer 27

-process of lens going from liquid to solid
-hard lens is cured slowly=lattice structure=longer to dye
-more open lattice structure=slower to dye

Question 28

What temperature should you dye at?

Answer 28

-dye the best when at the reccommened temp for that dye.

Question 29

How is lens tranmission measured? 2

Answer 29

-visually looking at them
-photometer measure light transmisson and UV in percent.

Question 30

What is the minimum edge thickness needed for grooving?

Answer 30

2.3mm