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Questions and Answers
What is the result of the equation -0.25 + 1.00 x 060?
What is the result of the equation -0.25 + 1.00 x 060?
- -1.00
- -0.25
- +0.75-1.00x150
- +0.75 (correct)
What is the sum of sphere and cylinder power -0.25 and 1.00?
What is the sum of sphere and cylinder power -0.25 and 1.00?
+0.75
What is the change in cylinder power if the original power is -1.00?
What is the change in cylinder power if the original power is -1.00?
-1.00
The result of adjusting the axis by 90 degrees from 060 is ___
The result of adjusting the axis by 90 degrees from 060 is ___
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What is the transposed RX for +0.75 and -1.00 x 150?
What is the transposed RX for +0.75 and -1.00 x 150?
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Study Notes
Prescription Transposition Summary
- Example prescription format: -0.25 + 1.00 x 060 indicates sphere and cylinder values.
- To combine sphere and cylinder powers: Add the numerical values. In this case, -0.25 + 1.00 results in +0.75.
- Changing cylinder power to minus format involves a sign change, turning +1.00 into -1.00.
- Adjusting the axis by 90 degrees means adding 90 to the original axis. For an axis of 060, it becomes 150. If the axis is greater than 90, subtract 90.
- The transposed prescription format combines the adjusted values: The final transposed RX is +0.75 -1.00 x 150.
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