Abo

Question 1

You are solving as a complete Prentice’s Rule
Right eye Rx is +4.75 -2.75 X 120
Left eye Rx is +3.50 -1.50 X 110
OC heights raised 8mm
How much prism and what direction?

Answer 1

1. Need to find power in 90°
   120-90=30. 30/120=0.25
   .25x-2.75= -0.6975
   -.6975++4.75= +4.05
   +4.05x8/10= 3.2
   110-90= 20. 20/110= .18
   .18x-1.50= -0.27
   -.27++3.5= +3.23
   +3.23x8/10= 2.6

3.2-2.6= 0.6

Question 2

Aniseikonia

Answer 2

Unequal image sizes cause by the retinas

Question 3

Prism in a progressive lens is checked_________________

Answer 3

At the PRP or prism dot

Question 4

POW measurements for a free-form progressive

Answer 4

-lens tilt
-vertex distance
-frame wrap - face form

NOT binocular PD

Question 5

3 Prism Diopters Base In (BI) on the right eye can also be described as _____________________________

Answer 5

3 @ 000 degrees

Question 6

Which is NOT found as part of temporary painted on marks on a progressive lens?

Answer 6

Material code

Items on: 180 reference line
Fitting cross
Prism reference point

Question 7

Which material is generally thought to provide the best impact resistance for children’s eyewear?

Answer 7

Polycarbonate

Question 8

Using the Rx -1.00 -1.50 X 90, what is the power of the lens at the 180th meridian?

Answer 8

-2.50

NOT -1.00

Question 9

One of the ways of identifying a lens with minus power is to look for ___________________________

Answer 9

Objects seen through the lens seem to move in the same direction as the lens is moving.

Question 10

I am making sure that both the eye wires have the same tilt in the 90. In standard alignment this is called checking for _______________________

Answer 10

Checking for x-ing

Question 11

The wavelength of 700nm is seen by the brain as what color?

Answer 11

Red

Question 12

According to ANSI Z80.1-2015, the standard tolerance for add power greater than 4.00 is ________________

Answer 12

0.18D

Question 13

As the pantoscopic angle or tilt changes, it ________________

Answer 13

Also changes the effective sphere power and induces cylinder in the 90 meridian

Question 14

In a minus powered lens, light rays _____________ and are said to come to a focal point _______________ the lens

Answer 14

Diverge, in front of

Question 15

The process used to reduce the bottom thickness of a progressive lens is called

Answer 15

Prism thinning

Question 16

Keratitis

Answer 16

An inflammation of the cornea

Question 17

Bone where temple bend is located

Answer 17

Mastoid bone