Dispensing and Fitting Procedures Flashcards

A patient's glasses slide down the nose constantly. Which adjustment is MOST appropriate?

Answer: Add nose pad armature tension or adjust pad angle

Adjusting nose pad tension or angle increases friction and grip to prevent the frame from sliding down.

Which fitting measurement determines the height at which the progressive addition lens corridor should be placed?

Answer: Segment height (fitting height)

The segment (fitting) height marks the position of the pupil center relative to the frame bottom to align the progressive corridor correctly.

When dispensing a frame with a high base curve, which optical effect is most important to consider?

Answer: Wrap-induced oblique astigmatism

High base curve wrap frames introduce oblique astigmatism when the lens plane is not perpendicular to the line of sight.

A patient complains of facial pressure behind the ears after wearing new glasses for one hour. The FIRST adjustment to check is:

Answer: Temple length and bend position

Discomfort behind the ears is usually caused by temples that are too short or have their bend positioned too far forward.

For a patient with a high minus prescription, which lens design choice reduces edge thickness the most?

Answer: Small frame with high-index lens

A smaller frame minimizes the lens diameter needed, and a higher-index material bends light more efficiently, both reducing edge thickness.

What is the purpose of a splay adjustment on metal nose pads?

Answer: To widen or narrow the distance between the pads

Splay adjustment moves the nose pads inward or outward to match the width of the patient's nasal bridge.

A dispensing optician verifies a finished lens using a lensometer. If the mires appear broken or distorted, this most likely indicates:

Answer: Scratched or defective lens surface

Broken or distorted mires in the lensometer indicate surface irregularities such as scratches, warpage, or coating defects.