FREE National Opticianry Competency Exam (NOCE) Lensometry & Prescription Analysis Questions and Answers

Question 1

An optician is verifying a new pair of eyeglasses for a patient.
The lensometer reading for the right lens shows -2.50 -0.75 x 180.
The written prescription for the right eye is -2.50 -0.75 x 90.
What is the most likely error?

Accepted Answer

The cylinder axis is incorrect.

Answer

The sphere power is incorrect.

Answer

The cylinder power is incorrect.

Answer

The lensometer is out of calibration.

Question 2

Which of the following describes the proper procedure for neutralizing a prism using a manual lensometer?

Accepted Answer

Place the lens in the lensometer, center the target using the X-Y adjustment, then rotate the prism compensator until the target moves to the optical center.

Answer

Align the optical center of the lens with the target, then adjust the lens until the target is centered.

Answer

Rotate the lens until the prism reference mark is aligned with the major reference point, then read the power.

Answer

Place the lens in the lensometer, center the target using the X-Y adjustment, then rotate the lens until the target is clear.

Question 3

An optician measures a multifocal lens on a lensometer. The distance power is -1.00 D sphere. When measuring the near power through the add segment, the reading is +1.25 D sphere. What is the add power for this lens?

Accepted Answer

+2.25 D

Answer

+0.25 D

Answer

-2.25 D

Answer

+1.25 D

Question 4

What is the primary purpose of taking a spectacle prescription history from a patient prior to performing lensometry and dispensing new eyewear?

Accepted Answer

To understand the patient's previous visual experience and potential adaptation issues.

Answer

To confirm the patient's insurance coverage.

Answer

To determine the patient's frame preferences.

Answer

To calculate the patient's visual acuity without correction.

Question 5

When neutralizing a spherical lens on a manual lensometer, what indicates that the lens power has been correctly read?

Accepted Answer

The target lines are clear, sharp, and centered.

Answer

The target lines are perpendicular to each other.

Answer

The target lines are thick and dark.

Answer

The target lines are moving in sync with the lens movement.

Question 6

A patient's prescription reads OD: +1.00 -0.50 x 045, OS: +1.25 -0.75 x 135. If the optician incorrectly transposes the right eye's prescription to +0.50 +0.50 x 135, which of the following statements is true regarding the transposed form?

Accepted Answer

The sphere, cylinder, and axis are all incorrect.

Answer

The sphere power is correct, but the cylinder power and axis are incorrect.

Answer

The sphere, cylinder, and axis are all correct.

Answer

The sphere power is incorrect, but the cylinder power and axis are correct.

An optician is verifying a new pair of eyeglasses for a patient.The lensometer reading for the right lens shows -2.50 -0.75 x 180.The written prescription for the right eye is -2.50 -0.75 x 90.What is the most likely error?

An optician is verifying a new pair of eyeglasses for a patient.
The lensometer reading for the right lens shows -2.50 -0.75 x 180.
The written prescription for the right eye is -2.50 -0.75 x 90.
What is the most likely error?