Prentice rule - Study guides, Class notes & Summaries
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ABO Practical Exam Solved 100% Correct!!
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Cancelling effect- subtract prism amounts - BU/BU 
BD/BD 
BI/BO 
Powers between 0.00 & +/- 3.00 - Read in 1/8 diopters 
.12 
.37 
.62 
.87 
Lensometer is also referred to as - Lensmeter, focimeter, vertometer 
To focus eyepiece - 1) while turned off. Place white sheet of paper against lens stop. 
2) turn focus ring all the way counter clockwise,and then back clockwise until sharp. 
3) remove paper and turn lensometer on 
4) move power drum to high plus, then turn away from you until sharp- shoul...
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ABO Practical Exam Questions And Correct Answers, With Complete Verified Solution
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ABO Practical Exam Questions And Correct Answers, With Complete Verified Solution. 
 
Cancelling effect- subtract prism amounts 
BU/BU 
BD/BD 
BI/BO 
Powers between 0.00 & +/- 3.00 
Read in 1/8 diopters 
.12 
.37 
.62 
.87 
Lensometer is also referred to as 
Lensmeter, focimeter, vertometer 
To focus eyepiece 
1) while turned off. Place white sheet of paper against lens stop. 
2) turn focus ring all the way counter clockwise,and then back clockwise until sharp. 
3) remove paper and turn lensomet...
-
ABO Practical Exam Questions And Correct Answers, With Complete Verified Solution.
- Exam (elaborations) • 3 pages • 2024
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- $10.77
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ABO Practical Exam Questions And Correct Answers, With Complete Verified Solution. 
 
Cancelling effect- subtract prism amounts 
BU/BU 
BD/BD 
BI/BO 
Powers between 0.00 & +/- 3.00 
Read in 1/8 diopters 
.12 
.37 
.62 
.87 
Lensometer is also referred to as 
Lensmeter, focimeter, vertometer 
To focus eyepiece 
1) while turned off. Place white sheet of paper against lens stop. 
2) turn focus ring all the way counter clockwise,and then back clockwise until sharp. 
3) remove paper and turn lensomet...
-
ABO Advanced Formulas Solved 100%
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Resolving Prism= - ANSWER-Vertical = (prism)(sin angle) 
Horizontal = (prism) (cos angle) 
 
Resultant Prism= - ANSWER-The square root of (Vertical prism^2) + (Horizontal prism^2) 
tan a=V/H 
 
Shape Factor= - ANSWER-1/1-(T/NxF) 
T=center thickness in m 
N= index of refraction of lens material 
F= front base curve 
 
Power Factor= - ANSWER-1/1-(HxD) 
H= vertex distance plus 3 mm in m 
D= Dioptric power 
 
Spectacle Magnification= - ANSWER-shape factor x power factor 
1/ 1-(T/NxF) x 1/1-(HxD) 
...
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ABO PRACTICAL EXAM(VERRIFIED 2023-2024)
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ABO PRACTICAL EXAM(VERRIFIED 
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Cancelling effect- subtract prism amounts - CORRECT ANSWER-BU/BU 
BD/BD 
BI/BO 
Powers between 0.00 & +/- 3.00 - CORRECT ANSWER-Read in 1/8 diopters 
.12 
.37 
.62 
.87 
Lensometer is also referred to as - CORRECT ANSWER-Lensmeter, focimeter, 
vertometer 
To focus eyepiece - CORRECT ANSWER-1) while turned off. Place white sheet of 
paper against lens stop. 
2) turn focus ring all the way counter clockwise,and then back clockwise until sharp. 
3) remove paper...
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ABO Practical Exam Questions and Answers 100% Verified
- Exam (elaborations) • 4 pages • 2024
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When should you use occluder? - For noticeable eye abnormalities. Ex.: Strabismus. 
Also to check binocular PD by occluding each eye to see if eye moved when occluded. 
BD/BD - Cancels- subtract 
BI/BI - Compounds- add 
BI/BO - Cancels- subtract 
Binocular PD - Total PD of both eyes together. From one pupil to the other pupil. 
Black numbers on lensometer power drum - (+) 
BO/BO - Compounds- add 
BU/BD - Compounds- add 
BU/BU - Cancels- subtract 
Cancelling effect- subtract prism amounts - BU/BU...
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ABO -American Board of Opticianry Practical Exam Questions and Answers
- Exam (elaborations) • 4 pages • 2024
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Available in package deal
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ABO -American Board of Opticianry Practical Exam Questions and Answers 
Cancelling effect- subtract prism amounts{Answer: - BU/BU 
BD/BD 
BI/BO 
 
Powers between 0.00 & +/- 3.00{Answer: - Read in 1/8 diopters 
.12 
.37 
.62 
.87 
 
Lensometer is also referred to as{Answer: - Lensmeter, focimeter, vertometer 
 
To focus eyepiece{Answer: - 1) while turned off. Place white sheet of paper against lens stop. 
2) turn focus ring all the way counter clockwise,and then back clockwise until sharp. 
3) ...
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ABO Study Guide 2023/2024 QUESTIONS AND ANSWERS GRADED A+
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Prentice Rule - ANS (Power x distance in mm) /10 
Cornea index of refraction - ANS 1.37 
Tear Film, Vitreous index of refraction - ANS 1.33 
Crystalline lens index of refraction - ANS 1.42 
Optical Standard index of refraction - ANS 1.53 
Crown Glass index of refraction - ANS 1.523 
High index of refraction - ANS 1.74 
CR-39 index of refraction - ANS 1.49/1.50 
Poly index of refraction - ANS 1.586 
Air - ANS 1.00 
How fast does light travel through air - ANS 186,000 mi/sec 
MBS formula - ANS ED+...
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ABO Practical Exam Questions and Answers 2024
- Exam (elaborations) • 4 pages • 2024
- Available in package deal
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- $10.49
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ABO Practical Exam Questions and Answers 2024 
Cancelling effect- subtract prism amounts -Answer-BU/BU 
BD/BD 
BI/BO 
Powers between 0.00 & +/- 3.00 -Answer-Read in 1/8 diopters 
.12 
.37 
.62 
.87 
Lensometer is also referred to as -Answer-Lensmeter, focimeter, vertometer 
To focus eyepiece -Answer-1) while turned off. Place white sheet of paper against lens 
stop. 
2) turn focus ring all the way counter clockwise,and then back clockwise until sharp. 
3) remove paper and turn lensometer on 
4) ...
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All ABO -American Board of Opticianry Exams| Questions Solved 100% Correct |Test Bank 2024 Rated A+ Guide
- Exam (elaborations) • 339 pages • 2024
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TEST BANK 
All ABO -American Board of Opticianry Exams| Questions Solved 100% Correct |Test Bank 2024 Rated A+ Guide 
AMERICAN BOARD OF OPTICIANRY (ABO) PRACTICE TEST	3 
ABO WITH CORRECT QUESTIONS AND ANSWERS	17 
AMERICAN BOARD OF OPTICIANRY (ABO) EXAM PREP	22 
AMERICAN BOARD OF OPTICIANRY PRACTICE EXAM	29 
ABO EXAM PRE-TEST	51 
ABO REVIEW QUESTIONS	71 
ABO NCLE (AMERICAN BOARD OF OPTICIANRY) QUESTIONS	75 
AMERICAN BOARD OF OPTICIANRY (ABO) EXAM	83 
AMERICAN BOARD OF OPTICIANRY (ABO) STUDY GUIDE...
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