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
Correct Answer:

Verified
Correct Answer:
Verified
Q13: What does a remote tracer do?<br>A)Decrease the
Q14: What does a pupilometer measure?<br>A)The size of
Q15: Which instrument measures the curvature of the
Q16: Is it necessary to verify the intermediary
Q17: Hot air warmers should not be used
Q19: During a lensometer examination, if the examiner
Q20: What is a lens box used for?<br>A)It
Q21: How can you check a lens clock
Q22: Vertex distance is measured by using which
Q23: Screwdriver tips can be replaced when they