Abo Flashcards
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?
- 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
Aniseikonia
Unequal image sizes cause by the retinas
Prism in a progressive lens is checked_________________
At the PRP or prism dot
POW measurements for a free-form progressive
-lens tilt
-vertex distance
-frame wrap - face form
NOT binocular PD
3 Prism Diopters Base In (BI) on the right eye can also be described as _____________________________
3 @ 000 degrees
Which is NOT found as part of temporary painted on marks on a progressive lens?
Material code
Items on: 180 reference line
Fitting cross
Prism reference point
Which material is generally thought to provide the best impact resistance for children’s eyewear?
Polycarbonate
Using the Rx -1.00 -1.50 X 90, what is the power of the lens at the 180th meridian?
-2.50
NOT -1.00
One of the ways of identifying a lens with minus power is to look for ___________________________
Objects seen through the lens seem to move in the same direction as the lens is moving.
I am making sure that both the eye wires have the same tilt in the 90. In standard alignment this is called checking for _______________________
Checking for x-ing
The wavelength of 700nm is seen by the brain as what color?
Red
According to ANSI Z80.1-2015, the standard tolerance for add power greater than 4.00 is ________________
0.18D
As the pantoscopic angle or tilt changes, it ________________
Also changes the effective sphere power and induces cylinder in the 90 meridian
In a minus powered lens, light rays _____________ and are said to come to a focal point _______________ the lens
Diverge, in front of
The process used to reduce the bottom thickness of a progressive lens is called
Prism thinning
