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If You Have the Following Prescription, How Would You Use

Question 18

Multiple Choice

If you have the following prescription, how would you use the lensometer to read it in minus cylinder?
Prescription: -2.00 +3.00 X 65


A) First transpose the power. Put the axis adjustment wheel on 180, turn the power drum far into the plus powers and begin to turn back toward you to find the sphere power at -1.00, then on to find cylinder power at +3.00
B) First transpose the power. Put the axis adjustment wheel on 155, turn the power drum far into the plus powers and begin to slowly turn the wheel back toward you to find the sphere power at +1.00, then on to find cylinder power at -2.00. The difference between the +1.00 and the -2.00 is -3.00

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