Prentice rule - Study guides, Class notes & Summaries
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Math for ABO test Latest Questions and Answers(American Board of Opticianry (ABO)
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Math for ABO test Latest Questions and Answers(American Board of Opticianry (ABO) 
A Box: 53 DBL: 15 ED: 55 PD: 30/32 
OD: 68/2 =34 OS: 68/2=34 
 
What is the MBS for the rt and left lens? {Answer: - OD: 68/2 =34 
OS: 68/2=34 
Decentration: Frame PD- PT PD 
OD: 34-30=4 decentered 
OS: 34-32= 2 decentered 
OD: MBS=ED+(2xDecenter)+2 
MBS=55+ 8 (2x4)+2=65mm 
OS: MBS=ED+(2x decenter)+2 
MBS=55+4 (2x2)+2=61mm 
OD-65mm blank 
OS: 61MM blank 
 
What is Prentice rule used for? {Answer: - To (Power x di...
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ABO exam Study Guide with Questions and 100% Solutions
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Prentice Rule - (Power x distance in mm) /10 
Cornea index of refraction - 1.37 
Tear Film, Vitreous index of refraction - 1.33 
Crystalline lens index of refraction - 1.42 
Optical Standard index of refraction - 1.53 
Crown Glass index of refraction - 1.523 
High index of refraction - 1.74 
CR-39 index of refraction - 1.49/1.50
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Math For ABO Test (ABO -American Board Of Opticianry Test) Solved 100% Correct
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Math For ABO Test (ABO -American Board Of Opticianry Test) Solved 100% Correct 
 
A Box: 53 DBL: 15 ED: 55 PD: 30/32 
OD: 68/2 =34 OS: 68/2=34 
 
What is the MBS for the rt and left lens? [Correct Ans: - OD: 68/2 =34 
OS: 68/2=34 
Decentration: Frame PD- PT PD 
OD: 34-30=4 decentered		 
OS: 34-32= 2 decentered 
OD: MBS=ED+(2xDecenter)+2 
MBS=55+ 8 (2x4)+2=65mm 
OS: MBS=ED+(2x decenter)+2 
MBS=55+4 (2x2)+2=61mm 
OD-65mm blank 
OS: 61MM blank 
 
What is Prentice rule used for? [Correct Ans: - To ...
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Math for ABO test Questions and Answers I ABO (American Board of Opticianry)
- Exam (elaborations) • 3 pages • 2024
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Math for ABO test Questions and Answers I ABO (American Board of Opticianry) 
A Box: 53 DBL: 15 ED: 55 PD: 30/32 
OD: 68/2 =34 OS: 68/2=34 
 
What is the MBS for the rt and left lens? (Ans: - OD: 68/2 =34 
OS: 68/2=34 
Decentration: Frame PD- PT PD 
OD: 34-30=4 decentered 
OS: 34-32= 2 decentered 
OD: MBS=ED+(2xDecenter)+2 
MBS=55+ 8 (2x4)+2=65mm 
OS: MBS=ED+(2x decenter)+2 
MBS=55+4 (2x2)+2=61mm 
OD-65mm blank 
OS: 61MM blank 
 
What is Prentice rule used for? (Ans: - To (Power x distance in m...
-
ABO Study Guide Questions with Verified Answers 2024
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ABO Study Guide Questions with Verified Answers 2024 
 
 
Prentice Rule Correct Answer: (Power x distance in mm) /10 
 
Cornea index of refraction Correct Answer: 1.37 
 
Tear Film, Vitreous index of refraction Correct Answer: 1.33 
 
Crystalline lens index of refraction Correct Answer: 1.42 
 
Optical Standard index of refraction Correct Answer: 1.53 
 
Optical Standard index of refraction Correct Answer: 1.523 
 
High index of refraction Correct Answer: 1.74 
 
CR-39 index of refraction Correc...
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ABO Study Guide Questions with Complete Solutions
- Exam (elaborations) • 13 pages • 2023
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ABO Study Guide Questions with Complete Solutions 
 
Prentice Rule - ANSWER (Power x distance in mm) /10 
 
Cornea index of refraction - ANSWER 1.37 
 
Tear Film, Vitreous index of refraction - ANSWER 1.33 
 
Crystalline lens index of refraction - ANSWER 1.42 
 
Optical Standard index of refraction - ANSWER 1.53 
 
Crown Glass index of refraction - ANSWER 1.523 
 
High index of refraction - ANSWER 1.74 
 
...
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ABO Practical Exam Questions And Correct Answers, With Complete Verified Solution.
- Exam (elaborations) • 3 pages • 2024
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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...
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ABO Study Guide Questions & Answers Passed
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ABO Study Guide Questions & Answers Passed 
Prentice Rule - ️️ (Power x distance in mm) /10 
Cornea index of refraction - ️️ 1.37 
Tear Film, Vitreous index of refraction - ️️ 1.33 
Crystalline lens index of refraction - ️️ 1.42 
Optical Standard index of refraction - ️️ 1.53 
Crown Glass index of refraction - ️️ 1.523 
High index of refraction - ️️ 1.74 
CR-39 index of refraction - ️️ 1.49/1.50 
Poly index of refraction - ️️ 1.586 
Air - ️️ 1.00 
How fast...
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ABO Practical Exam Questions and Answers 2024
- Exam (elaborations) • 4 pages • 2024
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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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ABO, ABO Study Guide 2023/2024 QUESTIONS AND ANSWERS GRADED A+
- Exam (elaborations) • 14 pages • 2023
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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 throu...
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