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ABO numbers, math, formulas Exam 2024/2025 Questions With Completed & Verified Solution. $10.49   Add to cart

Exam (elaborations)

ABO numbers, math, formulas Exam 2024/2025 Questions With Completed & Verified Solution.

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  • Course
  • ABO-NCLE 2024/2025
  • Institution
  • ABO-NCLE 2024/2025

ABO numbers, math, formulas Exam 2024/2025 Questions With Completed & Verified Solution.

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  • September 19, 2024
  • 5
  • 2024/2025
  • Exam (elaborations)
  • Questions & answers
  • cornea ior ans 137
  • ABO-NCLE 2024/2025
  • ABO-NCLE 2024/2025
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ALICE12
ABO numbers, math, formulas

Prentice's Rule - ANS 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 - ANS 1.37

Tear Film, Vitreous IOR - ANS 1.33

Crystalline lens IOR - ANS 1.42

Optical Standard index of refraction - ANS 1.53

Crown Glass index of refraction - ANS 1.523

High index IOR - ANS 1.74

CR-39 IOR - ANS 1.49 - 1.50

Poly index of refraction - ANS 1.586

Air IOR - ANS 1.00

How fast does light travel through air - ANS 186,000 mi/sec

Minimum Blank Size (MBS) formula - ANS (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 - ANS 1/Dioptic Power

Dioptic Power formula, foci known - ANS 1/Focal Length (m)

Anisometropia - ANS Difference of 2 diopters between OD & OS

, What is the Radius of a 1 diopter curve? - ANS 530mm

Radius formula - ANS 530/Power = R

Power formula - ANS 530/Radius = Diop.

Vertical Decentration formula - ANS Seg.ht. - B/2
OC height - (B measurement / 2)

How much HORIZONTAL prism tolerance is allowed? - ANS 2/3 of a diopter
-or-
0.667

How much VERTICAL prism tolerance is allowed? - ANS 1/3 of a diopter
-or-
0.333

Base Curve tolerance - ANS +/-0.75

Sphere Tolerance up to 6.50 - ANS +/- 0.13

Sphere Tolerance above 6.50 - ANS +/- 2%

Cylinder Axis Tolerance >1.50 - ANS +/-2°

Cylinder Axis Tolerance >0.50 / less than or equal to 1.50 - ANS +/-3°

Cylinder Axis Tolerance >0.25 / less than or equal to 0.50 - ANS +/-7°

Cylinder Axis Tolerance >0.00 / less than or equal to 0.25 - ANS +/-14°

Drop ball test for Safety lenses - ANS 5/8ths in. diameter, weighing 0.56 oz. dropped 50ft

Frame PD - ANS A box + DBL

Total decentration - ANS Frame PD - Patient PD
A + DBL - PD (divide by 2 to get decentration per lens)

Base IN (MINUS) - ANS If lens PD is GREATER than pt. PD

Base OUT (MINUS) - ANS If lens PD is LESS than pt. PD

Thindex glass IOR - ANS 1.8

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