ABO Practical
A measurement - Correct Answer horizontal frame depth
ANSI - Correct Answer American National Standards Institute: A private, non-profit organization that coordinates the
development and use of voluntary consensus standards in the United States.
ASTM - Correct Answer American Society for Testing and Materials
B measurement - Correct Answer vertical frame depth
B& L style adjusting pliers - Correct Answer flat arm will work with pads whose mountings are flush against the pad
Bifocal - Correct Answer lens having two focus strengths
Big Brass screwdriver - Correct Answer unscrew most screw, with a large brass handle
Bridge pressure - Correct Answer 90% of eyeglass weight
too small bridge will cause irritation on the sides of the nose
to large a bridge will put unnecessary pressure on the crest of the patients nose
C- size - Correct Answer The circumference of the lens
Calculating Prismatic Effects - Correct Answer obtained at the center of an optical lens by producing a difference in
edge thickness, either by grinding the back surface at an angle to the front surface during lens surfacing or, if the lens
has sufficient power, de-centering the optical center of the lens
Cancelling Prism - Correct Answer BI & BO
BD & BD
BU & BU
chappel cutting pliers - Correct Answer he Chappel Cutting Plier cuts screw assemblies and reduces the risk of
damaging lenses
Circumference gauge - Correct Answer For quick and accurate measurements of lenses or patterns.
Compounding Prism - Correct Answer BI & BI
BO & BO
BU & BD
Corneal reflex Pupilometer - Correct Answer for precisely measuring and digitally recording pupillary distances. Used
for measuring of monocular and binocular
Datum Line - Correct Answer 180 line, reference point for measurements
DBC - Correct Answer distance between centers, also referred to as the frame PD or FPD
DBL - Correct Answer distance between lenses, smallest linear measurement between lenses
Digital Measurement System - Correct Answer takes measurements digitally for pd, seg height, and oc
Distometer - Correct Answer An instrument for measuring vertex distance.
ear pressure - Correct Answer 90% of adjustment to make it feel comfortable
ED - Correct Answer effective diameter, twice the longest radius of the lens
A measurement - Correct Answer horizontal frame depth
ANSI - Correct Answer American National Standards Institute: A private, non-profit organization that coordinates the
development and use of voluntary consensus standards in the United States.
ASTM - Correct Answer American Society for Testing and Materials
B measurement - Correct Answer vertical frame depth
B& L style adjusting pliers - Correct Answer flat arm will work with pads whose mountings are flush against the pad
Bifocal - Correct Answer lens having two focus strengths
Big Brass screwdriver - Correct Answer unscrew most screw, with a large brass handle
Bridge pressure - Correct Answer 90% of eyeglass weight
too small bridge will cause irritation on the sides of the nose
to large a bridge will put unnecessary pressure on the crest of the patients nose
C- size - Correct Answer The circumference of the lens
Calculating Prismatic Effects - Correct Answer obtained at the center of an optical lens by producing a difference in
edge thickness, either by grinding the back surface at an angle to the front surface during lens surfacing or, if the lens
has sufficient power, de-centering the optical center of the lens
Cancelling Prism - Correct Answer BI & BO
BD & BD
BU & BU
chappel cutting pliers - Correct Answer he Chappel Cutting Plier cuts screw assemblies and reduces the risk of
damaging lenses
Circumference gauge - Correct Answer For quick and accurate measurements of lenses or patterns.
Compounding Prism - Correct Answer BI & BI
BO & BO
BU & BD
Corneal reflex Pupilometer - Correct Answer for precisely measuring and digitally recording pupillary distances. Used
for measuring of monocular and binocular
Datum Line - Correct Answer 180 line, reference point for measurements
DBC - Correct Answer distance between centers, also referred to as the frame PD or FPD
DBL - Correct Answer distance between lenses, smallest linear measurement between lenses
Digital Measurement System - Correct Answer takes measurements digitally for pd, seg height, and oc
Distometer - Correct Answer An instrument for measuring vertex distance.
ear pressure - Correct Answer 90% of adjustment to make it feel comfortable
ED - Correct Answer effective diameter, twice the longest radius of the lens
