FREE ABO NOCE Basic Opticianry Ophthalmic Dispensing Principles Questions and Answers

Question 1

When fitting progressive addition lenses (PALs), what is the most critical measurement to ensure proper vision through all zones?

Accepted Answer

Monocular pupillary distance (PD)

Answer

Frame PD

Answer

Segment height

Answer

Pantoscopic tilt

Question 2

A patient presents with a prescription of OD -2.00 -1.00 x 090 and OS -1.50 -0.75 x 180. They report difficulty with peripheral distortion and 'swim' sensation with their current conventional lenses. Which lens design feature would most likely mitigate these issues?

Accepted Answer

Free-form (digital) design

Answer

Photochromic technology

Answer

Anti-reflective coating

Answer

Hydrophobic treatment

Question 3

Which of the following describes the primary purpose of an anti-reflective (AR) coating on spectacle lenses?

Accepted Answer

To reduce reflections from the front and back surfaces of the lens.

Answer

To protect the lens from scratches and abrasions.

Answer

To block harmful UV radiation from reaching the eye.

Answer

To darken the lens in response to UV light exposure.

Question 4

When neutralizing a spherical lens using a lensometer, what indicates that the lens is properly centered and in focus?

Accepted Answer

The mires are clear, unbroken, and centered in the target.

Answer

The mires appear blurred and distorted.

Answer

The mires show significant movement when the lens is shifted.

Answer

Only the power drum needs to be adjusted until the mires are clear.

Question 5

What is the primary optical effect of prism in a spectacle lens?

Accepted Answer

To shift the image of an object towards the prism's apex.

Answer

To correct refractive errors like myopia or hyperopia.

Answer

To magnify objects for patients with low vision.

Answer

To filter out specific wavelengths of light.

Question 6

A patient's prescription includes a base curve of 6.00D. What does 'base curve' primarily refer to in ophthalmic dispensing?

Accepted Answer

The power of the front surface of a lens.

Answer

The total power of the lens.

Answer

The thickness of the lens at its center.

Answer

The curvature of the back surface of a lens.