Spectacle Dispensing Procedures Flashcards
7 cards from real ABO NOCE Basic Opticianry practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Spectacle Dispensing Procedures flashcards as text
Pantoscopic tilt refers to the angle formed between the lens plane and:
Answer: A vertical plane perpendicular to the line of sight
Pantoscopic tilt is the forward tilt of the lens plane measured from a vertical reference, typically 8–12° for most prescriptions.
A patient's glasses slide down constantly despite proper nose pad adjustment. The most effective additional correction is:
Answer: Add retaining cable temples
Cable temples wrap around the ear, providing secure retention and preventing the frame from sliding on the face.
When verifying a finished lens using a lensometer, the sphere power is read when:
Answer: The target is centered and the sphere lines are clear
In a manual lensometer, sphere power is confirmed when the sphere lines (one set) are brought into sharp focus with the target centered in the reticle.
For a patient with a high minus prescription, which frame characteristic minimizes edge thickness?
Answer: Small eye size with centered PD
A small eye size minimizes the distance from the optical center to the edge, directly reducing edge thickness for minus lenses.
When checking the fit of a newly dispensed frame, the optician observes the temples are diverging (spreading apart) behind the ears. This is corrected by:
Answer: Bending the temples inward at the bend
Bending the temple tips inward at the bend point creates inward tension, preventing the frame from spreading and improving retention.
The Boxing System for measuring lenses uses:
Answer: A box enclosing the lens with horizontal and vertical dimensions
The Boxing System uses the smallest enclosing rectangle (box) around the lens shape, with eye size = horizontal width and B measurement = vertical depth.
A patient reports intermittent double vision when reading after receiving new progressive lenses. The most likely dispensing cause is:
Answer: The near PD is set too wide
If the near PD is too wide, the patient's eyes must converge more than expected through the reading zone, causing binocular stress and possible diplopia.