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ABO- Optical Formulas WITH 100- CORRECT ANSWERS
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ABO- Optical Formulas WITH 100- CORRECT ANSWERS
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UNICEABO- Optical Formulas WITH 100% SURE AQNSWERSE
Terms in this set (69)
What is the radius of curvature of a lens 1.00D= 530mm
with 1.00D base curve?
6.00D x ? = 530mm
What is the radius of curvature of a lens
(6.00D/6.00D) x ? = (530mm/6.00D)
with 6.00D base curve?
?= 88.33
2.00D x ? = 530mm
What is the radius of curvature of a lens
(2.00D/2.00D) x ? =(530mm/2.00D)
with 2.00D base curve?
?=265mm
0.50D x ? = 530mm
What is the radius of curvature of a lens
(0.50D/0.50D) x ? = (530mm/0.50mm)
with 0.50D base curve?
?= 1060mm
4.00D + ? = -2.00D
A -2.00D lens has a +4.00D base curve.
-4.00D. -4.00D
What is the value of the posterior curve?
?= -6.00D
7.25D + ? = +3.00D
A +3.00D lens has a +7.25D base curve.
-7.25D. -7.25D
What is the value of the ocular curve?
? = -4.25D
? +(-2.00D)= 3.00D
What is the front curve of a +3.00D lens if
+2.00D. +2.00D
the back curve is -2.00D?
? = 5.00D
What is the power of a lens if the front 3.00 + (-2.00D @ 180)= 1.00D
curve is +3.00D and the back curve is 3.00 + (-1.00D @ 90) = 2.00D
-2.00D at 180° and -1.00D at 90°?
What are the two values on the optical -4.50 @ 90
cross? -3.00 @ 180
Rx -3.00 -1.50 x 180
What are the two values on the optical -2.50 @ 90
cross? -1.50 @ 180
Rx -2.50 +1.00 x 90
What are the two values on the optical -1.50 @ 90
cross? Plano @ 180
Rx -1.50 +1.50 x 90
What is the power of the near portion? +1.50D + 2.00D= +3.50 -1.00 × 90
+1.50 -1.00 x 90 Add +2.00D
1/6
, A lens has a power of +2.00D at 90° and +2.00 -1.00 x90
+1.00D at 180°. What is the written Rx of this +1.00 +1.00 x180
lens?
A lens has a power of +3.00D at 180° and -1.00 + 4.00 x90
-1.00D @90°. What is the Rx? +3.00 - 4.00 x 180
What is the minimum blank size formula? MBS= ED + (2 x decentration per eye)
What is the MBS? Decentration= 54mm +18mm= 72mm
A= 54mm 72mm-66mm= 6mm or 3mm per eye
DBL= 18mm MBS= 58mm +(2x3mm)
ED=58mm MBS= 64mm
PD=66mm
What is the smallest lens blank possible for Decentration= 4mm
a 53mm round eyesize frame if each lens ED=53mm
optical center must be decentered 4mm MBS= 53mm + (2×4mm)
in? MBS= 61mm
Decentration= 55mm + 13mm= 68mm
What is the MBS? 68mm-66mm=2mm or 1mm per eye
A=55mm DBL= 13mm ED= 42mm PD=66mm MBS=42mm +(2x1mm)
MBS=44mm
A frame with the following measurements Vertical frame center= 23mm (46mm/2)
has its bifocal segment placed 17mm high Bifocal segment top= 23-17=6mm below center
in the eyewire. Measured from the datum
line, where will the top of the bifocal be
placed?
A= 55mm
B=46mm
DBL= 18mm
ED= 58mm
What is the geometric center of the Frame centers= 72mm (54mm+18mm)
following frame?
A= 54mm
B= 46mm
DBL= 18mm
ED= 55mm
Given a patients PD of 35mm OU and a PD= 35mm+35mm=70mm
frame with the following measurements, Frame Center= 58mm+20mm=78mm
what will be the decentration of each eye? Total Decentration= 8mm or 4mm OU
A= 58mm
DBL= 20mm
1 prism= 1cm/1m
How much will a 2.00D prism lens deviate 2 prism= ?/4m
light at a distance of 4 meters? 4x2 prism= ?/(4/4)
8cm=?
4 prism=2cm/?
A 4.00D prism displaces light 2 cm at what ?×4=2×(?/?)
distance? ?(4/4)=2/4
?=0.5m
F=1/f or f=1/F
What is the power of a lens with a 0.50
F=1/0.50m
meter focal length in front of the lens?
F=-2.00D
2/6
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