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ABO FORMULAS QUESTIONS AND ANSWERS WITH SOLUTIONS 2024
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ABO FORMULAS QUESTIONS AND ANSWERS WITH SOLUTIONS 2024
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ABO FORMULAS QUESTIONS ANDANSWERS WITH SOLUTIONS 2024
Index of Refraction - ANSWER *Speed of light in air ÷ Speed of light in material
*186,000 miles per second
Minimum Blank Size (MBS) - ANSWER *(GMC−PD) + ED
GMC= Geometric Center (A+DBL)
Geometric Center (GMC) - ANSWER A+DBL
Slab Off Formula - ANSWER Find reading O.C. (distance O.C. minus 10mm)
Find total power of lenses at 90 degrees
Use Prentice Rule to find prism difference between right and left lenses
Slab Off Definition - ANSWER This is a fabrication process in which base-up prism is ground on the lower
portion of the lens to redirect light as a patient gazes downward.
This technique allows the patient to fuse the images and prevent prism as the eye travels down the vertical
meridian of the lens
Toric Transposition - ANSWER used to determine lens power in the principal meridians
How do you find the total or absolute lens power at 180 degrees or 90 degrees when Rx gives it at 45
degrees or 135 degrees? - ANSWER Divide cylinder in half and add to sphere
How do you determine the lens power 90 degrees away from the cylinder axis? - ANSWER Algebraically
add sphere power to cylinder power
Prentice's Rule - ANSWER Amount of induced prism = power of lens x decentration in centimeters
*If the lens power is +5. The decentration is 1cm. So, 1cm x power of 5 = 5 prism diopters (the amount of
induced prism)
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