Lab Requirements

Question 1

Diamond hand stone cuts…

Answer 1

Faster

Question 2

3 different pattern makers

Answer 2

Weco 1st generation Kapper $40kCobern Gives 3D image where to put bevel Cut, bevel, polish, groove Edgemaster $4k More simple

Question 3

Which direction do you move for OD to get BO?

Answer 3

Left on the reticle

Question 4

What do prism rings do? What increments fo they come in?

Answer 4

Move the target 3, 6, 9

Question 5

How do you read a -23.00 Rx on the lensometer?

Answer 5

1. Grab trial lenses from the Dr. 2. Maybe +5.00 to bring it down 3. Now the lens should read at -18.00

Question 6

Tolerance for Resultant Prisms

Answer 6

0.1 Prism Diopter 1 Degree Axis

Question 7

Spectrometer

Answer 7

Measures the transmission of light through the lens What you see is how much is getting through 1= 99% light is not getting through 100= 100% light is getting through

Question 8

3 Different Spectrometers

Answer 8

BPI UV only Spectrum Scan UV or Visible Light Universal Briot 7 boxes lit means 35% is getting through Not lit x 5 = Absorbed % If someone is picky, hide the sample

Question 9

Distance Decentration

Answer 9

FPD - PPD

Question 10

Reading Decentration (Inset)

Answer 10

Distance PPD - Reading PPD

Question 11

Total Inset

Answer 11

Distance Decentration + Reading Decentration

Question 12

BTS

Answer 12

BTS is where OC is located on Bifocal, can be different

Question 13

Calculate BTS

Answer 13

B divided in half Half the B minus the seg height

Question 14

Blocker Instructions

Answer 14

1. Set your Total Inset R — R = In L — L = In 2. Seg Drop/ Raise Go above or below 3. Center the Seg FT 28 center between 28s FT 35 center between 35s 4. Verify Distance Decentration -when seg is centered, then check Decentration, can’t change, have to surface again

Question 15

Bifocal Segment

Answer 15

Usually centered correctly Can live with 0.5 mm off Making them both off is worse In lab on Near PD is checked With stock lenses impossible to get PDs right

Question 16

How do you find the inset on an Executive Bifocal?

Answer 16

1. Draw a straight line 2. Look thru Executive lens 3. When it straightens, this point is the OC 4. Compare to Distance OC 5. This gives you the Inset

Question 17

Progressive Markings

Answer 17

1. Water markings are exactly 34 mm apart 2. Two digits show ADD power 3. All have 2.5 Inset 4. Minimum Fitting height of 22mm

Question 18

If the Rx is weak and there is prism, the Decentration is gonna be really large

Answer 18

Get prism surfaced, ground in Choose higher RX if you can