19 - High Powered Lens Designs

Question 1

What are 4 high plus lens design options? (+10.00)

Answer 1

-Regular spheric lenses
-High-index aspheric
-lenticulars
-Multidrop Lenses

Question 2

What are 3 high minus lens design options?(-10.00)

Answer 2

-Choosing right frame
-Myodisc
-Minus Lenticular

Question 3

What is a multidrop lenses?

Answer 3

-Made to overcome cosmetic negatives of lenticular while keeping a thin lens.
-large blended aspheric lenticular

Question 4

What is a myodisc lens? 3

Answer 4

-front surface that is either flat or almost flat
-contains cylinder component and also has a plano back carrier area
-high minus bowl in the middle of the back surface.

Question 5

What is a minus Lenticular Lens? 3

Answer 5

-semifinished lens that has a plus six or more front curve.
-Minus bowl is ground into the front which becomes the back
-Cylinder and reamianing power is ground into the now front of the lens.

Question 6

What are 7 segmented multifocal styles?

Answer 6

-Round seg
-Flat top
-Curved top
-Panoptik
-B-seg Ribbon
-R-seg Ribbon
-Executive Franklin Bifocal

Question 7

What is a trifocal lens? 2

Answer 7

-has an intermediate area between distance and near portions
-intermediate portion will be 50% of the near add

Question 8

What are 3 styles of trifocals?

Answer 8

-Flat top
-Executive
-E/D Trifocal

Question 9

What does this mean FT 7X25?

Answer 9

FT - flat top
7mm - depth of intermediate portion
25mm - overall width of segment

Question 10

What are 3 types of segmented occupational lenses and brief describtion?

Answer 10

-Double segment - 2 flat tops - bottom and top
-quadrafocal lens - double segment lens with a flat top trifocal and flat top at the top
-Rede-Rite bifocal - large round segment at the top for distance, large reading section at the bottom

Question 11

What are the 4 steps for fitting and measuring segmented multifocals/trifocals/bifocals?

Answer 11

1)Use actual frame
2)Adjust the frame to fit the px
3) Hold PD ruler where 0 is at lower limbus/lower lid margin
4)The bifocal height is the number measured at the lowest part of the groove inside the lower eyewire.

Question 12

What is the formula to calculate the near power?

Answer 12

Total near power= Distance Power + Near Addition

Question 13

What is the consideration when fitting/measuring a double d seg? 2

Answer 13

The lower edge of the top segment will automatically be 13/14 mm above the lower seg line.
-Reasonable minimum area for the upper seg is 9mm.

Question 14

Practice examples of finding Intermediate and reading adds

Question 15

Practice finding what we need to order from the lab intermediate and reading