ABO NOCE Basic Opticianry Spectacle Dispensing and Fitting Questions and Answers 2

Question 1

What is the pantoscopic tilt and what is the standard recommended angle?

Accepted Answer

The vertical angle of the frame front; typically 8–12°

Answer

The horizontal angle of the frame; typically 0–5°

Answer

The wrap angle of the frame; typically 15–20°

Answer

The angle of the temples; typically 5–10°

Question 2

When measuring monocular pupillary distance (PD), what is the correct procedure?

Accepted Answer

Measure from the center of the pupil to the center of the nose bridge for each eye separately

Answer

Measure from pupil center to pupil center with the patient fixating a distant target

Answer

Measure from the outer canthus to the pupil center

Answer

Measure from the lens optical center to the pupil

Question 3

What is the vertex distance and why does it matter for prescriptions over ±4.00 D?

Accepted Answer

The distance from the back lens surface to the cornea; it affects effective lens power at the eye

Answer

The distance from the optical center to the pupil; it determines PD accuracy

Answer

The distance from the frame front to the temples; it affects frame fit

Answer

The distance from the top of the frame to the pupil center; it determines seg height

Question 4

The facial measurement 'DBL' (distance between lenses) refers to:

Accepted Answer

The horizontal distance between the inner edges of the two lenses

Answer

The distance from pupil center to pupil center

Answer

The width of the nose bridge of the frame

Answer

The distance between the optical centers of the two lenses

Question 5

Which frame adjustment is used to correct a frame that sits too high on the patient's nose?

Accepted Answer

Increase the splay angle of the nose pads to widen the pad spread

Answer

Increase the pantoscopic tilt

Answer

Decrease the face-form angle

Answer

Tighten the temple bend

Question 6

What is the 'effective diameter' of a lens and how is it used in lens ordering?

Accepted Answer

The diameter of the smallest circle that will contain the entire lens shape; used to determine minimum blank size

Answer

The distance from the optical center to the farthest edge of the lens

Answer

The average of the horizontal and vertical lens dimensions

Answer

The diameter of the lens at its widest point