Add strength is - ANS-The difference among the sphere and energy in analyzing area of lens.
*subtract full studying quantity from sph. Fee
BD/BD - ANS-Cancels- subtract
BI/BI - ANS-Compounds- add
BI/BO - ANS-Cancels- subtract
Binocular PD - ANS-Total PD of both eyes collectively. From one student to the alternative pupil.
Black numbers on lensometer strength drum - ANS-(+)
BO/BO - ANS-Compounds- add
BU/BD - ANS-Compounds- upload
BU/BU - ANS-Cancels- subtract
Cancelling effect- subtract prism quantities - ANS-BU/BU
BD/BD
BI/BO
Cylinder strength is constantly used to decide if axis - ANS-Meets ANSI requirements
Fill in all parts of the analyzing values observed in the right form, inclusive of all: - ANS-Zeros
Ex. X 090
+zero.50
Focus sphere lines first, if cylinder lines recognition first - ANS-Rotate axis drum through 90°
How to check for vertical imbalance - ANS-1) mark OD, OC by using centering within retical
2) with out transferring the lens desk, circulate to OS lens
3) if no longer nevertheless focused, there is imbalance.
Lensometer is also called - ANS-Lensmeter, focimeter, vertometer
Major Reference Point: (MRP) - ANS-The point on a lens wherein the affected person is
supplied the prescription as written by way of the doctor. If prism isn't always referred to as for
inside the prescription then the lens OC and the MRP are the identical.
Measure cylinder fee of the lens by: bringing a long way strains into cognizance, THEN: -
ANS-Subtract modern-day size on power drum from spherical studying.
Monocular PD - ANS-Individual PD of every eye. From scholar to bridge.
Near reference point (NRP) - ANS-represents the region on the floor that gives the total target
Add power, that is the most useful area for verifying the Add energy of the prescription. It is
positioned on the middle of the near checking circle ink marking.
Optical Infinity - ANS-used to measure distance PD-is a distance of approximately twenty ft.
P=hcmxd - ANS-Prentice rule
P(prism)
Hcm(quantity moved)
D(diopter)
PD for bifocals and trifocals - ANS-Binocular
PD for Single vision & progressive - ANS-Monocular
Powers among 0.00 & +/- three.00 - ANS-Read in 1/eight diopters
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