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ABO numbers, math, formulas, Exams of Advanced Education

Walden UniversityAdvanced Education

ABO numbers, math, formulas ..

Typology: Exams

2025/2026

Available from 05/01/2026

maxwell-mbao
maxwell-mbao 🇺🇸

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ABO numbers, math, formulas
Prentice's Rule - CORRECT ANSWER >>>P = f x c
P = amount of prism correction
f = lens power (in diopters)
c = decentration (the distance between the pupil centre and the lens's
optical centre, in millimeters)
Cornea IOR - CORRECT ANSWER >>>1.37
Tear Film, Vitreous IOR - CORRECT ANSWER >>>1.33
Crystalline lens IOR - CORRECT ANSWER >>>1.42
Optical Standard index of refraction - CORRECT ANSWER >>>1.53
Crown Glass index of refraction - CORRECT ANSWER >>>1.523
High index IOR - CORRECT ANSWER >>>1.74
CR-39 IOR - CORRECT ANSWER >>>1.49 - 1.50
Poly index of refraction - CORRECT ANSWER >>>1.586
Air IOR - CORRECT ANSWER >>>1.00
How fast does light travel through air - CORRECT ANSWER >>>186,000
mi/sec
Minimum Blank Size (MBS) formula - CORRECT ANSWER >>>(GCD - PD) +
ED
A + DBL + ED - PD
Frame PD - PD + ED
Dec. + ED
GCD = geometric center distance or A + DBL
PD = Pt. PD
ED = effective diameter
Dec. = Decentration
Focal length formula, diopters known - CORRECT ANSWER >>>1/Dioptic
Power
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pf5

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ABO numbers, math, formulas Prentice's Rule - CORRECT ANSWER >>>P = f x c P = amount of prism correction f = lens power (in diopters) c = decentration (the distance between the pupil centre and the lens's optical centre, in millimeters) Cornea IOR - CORRECT ANSWER >>>1. Tear Film, Vitreous IOR - CORRECT ANSWER >>>1. Crystalline lens IOR - CORRECT ANSWER >>>1. Optical Standard index of refraction - CORRECT ANSWER >>>1. Crown Glass index of refraction - CORRECT ANSWER >>>1. High index IOR - CORRECT ANSWER >>>1. CR-39 IOR - CORRECT ANSWER >>>1.49 - 1. Poly index of refraction - CORRECT ANSWER >>>1. Air IOR - CORRECT ANSWER >>>1. How fast does light travel through air - CORRECT ANSWER >>>186, mi/sec Minimum Blank Size (MBS) formula - CORRECT ANSWER >>>(GCD - PD) + ED A + DBL + ED - PD Frame PD - PD + ED Dec. + ED GCD = geometric center distance or A + DBL PD = Pt. PD ED = effective diameter Dec. = Decentration Focal length formula, diopters known - CORRECT ANSWER >>>1/Dioptic Power

Dioptic Power formula, foci known - CORRECT ANSWER >>>1/Focal Length (m) Anisometropia - CORRECT ANSWER >>>Difference of 2 diopters between OD & OS What is the Radius of a 1 diopter curve? - CORRECT ANSWER >>>530mm Radius formula - CORRECT ANSWER >>>530/Power = R Power formula - CORRECT ANSWER >>>530/Radius = Diop. Vertical Decentration formula - CORRECT ANSWER >>>Seg.ht. - B/ OC height - (B measurement / 2) How much HORIZONTAL prism tolerance is allowed? - CORRECT ANSWER >>>2/3 of a diopter -or-

How much VERTICAL prism tolerance is allowed? - CORRECT ANSWER >>>1/3 of a diopter -or-

Base Curve tolerance - CORRECT ANSWER >>>+/-0. Sphere Tolerance up to 6.50 - CORRECT ANSWER >>>+/- 0. Sphere Tolerance above 6.50 - CORRECT ANSWER >>>+/- 2% Cylinder Axis Tolerance >1.50 - CORRECT ANSWER >>>+/-2° Cylinder Axis Tolerance >0.50 / less than or equal to 1.50 - CORRECT ANSWER >>>+/-3° Cylinder Axis Tolerance >0.25 / less than or equal to 0.50 - CORRECT ANSWER >>>+/-7° Cylinder Axis Tolerance >0.00 / less than or equal to 0.25 - CORRECT ANSWER >>>+/-14° Drop ball test for Safety lenses - CORRECT ANSWER >>>5/8ths in. diameter, weighing 0.56 oz. dropped 50ft

CR-39 IOR - CORRECT ANSWER >>>1.

Poly IOR - CORRECT ANSWER >>>1. Hi Index IOR - CORRECT ANSWER >>>1. Dress Drop Ball - CORRECT ANSWER >>>5/8ths in. diameter, weighing 0. oz. dropped 50ft Safety Drop Ball, diameter and weight - CORRECT ANSWER >>>1" diameter, dropped 50" Ht of drop ball fall - CORRECT ANSWER >>>50 inches Total weight of drop ball apparatus - CORRECT ANSWER >>>27 lbs ANSI - CORRECT ANSWER >>>Started 1915. American National Standards Institute Cornea Index IOR - CORRECT ANSWER >>>1. Anterior/Aqueous Chamber IOR - CORRECT ANSWER >>>1. Crystalline Lens IOR - CORRECT ANSWER >>>1. 1 inch = cm? - CORRECT ANSWER >>>2.54 cm Height of 20/20 line on Snellen chart - CORRECT ANSWER >>>8.87 cm MBS =? - CORRECT ANSWER >>>2 x D + ED =? D = decentration ED = effective diameter Prism - CORRECT ANSWER >>>Plus wide- Base out Plus narrow- in Plus high- up Plus low- down Minus wide- in Minus narrow- out Minus high- down Minus low- up Average eye size - CORRECT ANSWER >>>1 1/8 inches long

3-5 mm - CORRECT ANSWER >>>Average pupil size under normal lighting conditions 186,000 - CORRECT ANSWER >>>Speed of light in miles per second Visible light - CORRECT ANSWER >>> The amount of horizontal decentration required in each eye - CORRECT ANSWER >>>(GCD - PD) / 2 GCD = geometric center distance or A + DBL PD = Pt. PD Vogel's Rule: - CORRECT ANSWER >>>Rule-of-thumb for predicting base curves: For plus powers: Base = Sphere Power + 6. For minus powers: Base = Sphere power / 2 + 6. % of cyl. power at 90° away from principal meridian - CORRECT ANSWER >>>100% of Cylinder felt % of cyl. power at 60°/120° away from principal meridian - CORRECT ANSWER >>>75% of Cylinder felt % of cyl. power at 45°/135° away from principal meridian - CORRECT ANSWER >>>50% of Cylinder felt % of cyl. power at 30°/150° away from principal meridian - CORRECT ANSWER >>>25% of Cylinder felt % of cyl. power at principal meridian - CORRECT ANSWER >>>0% In a plus lens, what is the relationship between Decentration and Prism Base Direction? - CORRECT ANSWER >>>Decentration and Prism Base Direction are the same in a plus lens. In a minus lens, what is the relationship between Decentration and Prism Base Direction? - CORRECT ANSWER >>>Decentration and Prism Base Direction are the opposite in a minus lens. Vertex Distance formula - CORRECT ANSWER >>>DC = (mmm x (P^2)) 1000