Answer :
Final answer:
The question involves transposing an eyeglass prescription from plus-cylinder format to minus-cylinder format. The transposed prescription of +3.00 -2.00 x 30 would be +1.00 +2.00 x 120 based on the way to transpose a prescription.
Explanation:
The question is about transposing or changing the format of an eyeglass prescription. Usually, the prescription given by an optometrist or ophthalmologist can be in either plus-cylinder or minus-cylinder format. So in this case, the prescription given is in '+' or plus-cylinder format as +3.00 -2.00 x 30.
To transpose this to '-' or minus-cylinder format, you do the following:
- Add the sphere and cylinder powers together. The result is the new sphere power. In this case, +3.00 (sphere power) - 2.00 (cylinder power) = +1.00 (new sphere power).
- The new cylinder power is the negative of the old cylinder power. So, in this case, it's - (-2.00) = +2.00.
- If the axis is less or equal to 90, add 90 to get the new axis. If the axis is more than 90, subtract 90 to get the new axis. In this case, 30 + 90 = 120.
So, the transposed prescription for this case would be +1.00 +2.00 x 120.
Learn more about Eyeglass Prescription Transposing here:
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