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ABO numbers, math, formulas WITH 100- SURE ANSWERS
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EUNICEABO numbers, math, formulasWITH 100% SURE ANSWERS
Terms in this set (79)
P=fxc
P = amount of prism correction
Prentice's Rule f = lens power (in diopters)
c = decentration (the distance between the pupil centre and the lens's optical centre,
in millimeters)
Cornea IOR 1.37
Tear Film, Vitreous IOR 1.33
Crystalline lens IOR 1.42
Optical Standard index of refraction 1.53
Crown Glass index of refraction 1.523
High index IOR 1.74
CR-39 IOR 1.49 - 1.50
Poly index of refraction 1.586
Air IOR 1.00
How fast does light travel through air 186,000 mi/sec
(GCD - PD) + ED
A + DBL + ED - PD
Frame PD - PD + ED
Dec. + ED
Minimum Blank Size (MBS) formula
GCD = geometric center distance or A + DBL
PD = Pt. PD
ED = effective diameter
Dec. = Decentration
Focal length formula, diopters known 1/Dioptic Power
Dioptic Power formula, foci known 1/Focal Length (m)
Anisometropia Difference of 2 diopters between OD & OS
What is the Radius of a 1 diopter curve? 530mm
Radius formula 530/Power = R
Power formula 530/Radius = Diop.
Seg.ht. - B/2
Vertical Decentration formula
OC height - (B measurement / 2)
2/3 of a diopter
How much HORIZONTAL prism tolerance
-or-
is allowed?
0.667
1/4
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