Marco 101 - Lensometer Fall
Instructions: Please PRINT your answers in the space after each question. Do so in red ink.
1. What device is use for focusing the lensometers?
2. What is the reticle?
Prism Measurement sca
Exam 4 Lecture/Lab Notes
Reading Full ADD power + Sphere power (Do not adjust Cyl)
A. Reading Lenses Give FULL Add + SPH
B. Intermediate Lenses Give Add + SPH
Ex- Trifocal Top is intermediate; Bottom is Bifocal
Ophthalmic Dispensing Spring
In 1962 the Optical Manufacturers Association adopted the boxing system to provide a standard for frame and
lens measurement that greatly improved upon the accuracy of previous systems. The boxing system is
Lecture Notes Exam 2
Zyl Common material glasses are made of
Cellulose nitrate 1st glasses were made of this material
Cellulose Acetate Plastic Zyl adjust w/o heat too much heat can burn the frame become brittle or frigid
FPD = A + DBL
DPD + Inset
MBS = ED + 2(DEC)
B measurement Seg Height
Proper Fitting of Progressive Addition Lens
It is crucial to ensuring proper functionality that Progressive lenses fit the wearer
precisely. Fitting Progressive Addition Lenses (PALs) properly is an important duty that a