ABO Practical exam with well answered questions

ABO Practical exam with well answered
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questions
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Single Vision - CORRECT ANSWERS ✔✔corrects for one distance
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Multifocal - CORRECT ANSWERS ✔✔Corrects with two or more
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prescriptions (or 'powers')
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Bifocal - CORRECT ANSWERS ✔✔lens having two focus strengths
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Trifocal - CORRECT ANSWERS ✔✔pertaining to having three focus
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strengths
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Calculating Prismatic Effects - CORRECT ANSWERS ✔✔obtained at
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the center of an optical lens by producing a difference in edge
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thickness, either by grinding the back surface at an angle to the
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front surface during lens surfacing or, if the lens has sufficient
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power, de-centering the optical center of the lens
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Compounding Prism - CORRECT ANSWERS ✔✔BI & BI |/ |/ |/ |/ |/ |/ |/




BO & BO
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BU & BD
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Cancelling Prism - CORRECT ANSWERS ✔✔BI & BO |/ |/ |/ |/ |/ |/ |/




BD & BD
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, BU & BU |/ |/




Prentice's Rule - CORRECT ANSWERS ✔✔P=hcm x D |/ |/ |/ |/ |/ |/ |/




P=amount of prism created |/ |/ |/




h= number of cm OC moved
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cm= centimeters (convert to mm, divide by 10)
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D= power in meridian with error
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Vertical Imbalance - CORRECT ANSWERS ✔✔The difference in
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vertical prism power at the reading level in a pair of lenses.
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OC Height's by lens - CORRECT ANSWERS ✔✔SV = 1/2 of B
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Progressive = Fitting cross |/ |/ |/




FT = 5mm above segment
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Vertex Compensation - CORRECT ANSWERS ✔✔A plus lens when
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moved farther from the eye gains in plus power
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Distance is 0 with CL because they are on the eye
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Vertex compensation Formula - CORRECT ANSWERS ✔✔De= Dl/(1
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+ d xDl)
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De= diopter effective value of error created
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D/= lens power (given power)
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d= amount in METERS lens moved from refracted position to
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position lens is worn
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