Question

mcg eyeglass recycling center
vi. processing used glasses
all junior technicians should be familiar with the process for sorting, cleaning, and grading of raw, used glasses.
sorting: sunglasses, reading glasses, single vision glasses, and bifocal lenses in good condition of any style or dollar value should be kept for reuse. those with broken frames and loose lenses or scratches on the lenses should be disposed of.
cleaning: first, wash the glasses with a disinfecting solution and rinse them with warm water. follow this with another rinse using a vinegar and water solution. then clean the glasses in an ultrasonic machine. allow the glasses to air - dry on a towel - covered table. buff the glasses with a soft cotton cloth.
grading: a lensmeter is used to determine the prescription (strength) of the glasses. one technician should operate the lensmeter while another technician records the prescription on a label affixed to a plastic bag. the prescription should be recorded in black ink. the record should indicate first the right and then the left lens prescription. discard glasses with lenses that have vastly different prescriptions. identify nonprescription lenses with the letters \pl\ which is short for \plano.\ refer to appendices e and f for symbols to record single and bifocal vision lenses. after recording the prescription, put the glasses in the plastic bag.
as used in the last paragraph of the instructions shown, plano refers to:
a. lenses with different prescriptions.
b. nonprescription lenses.
c. raw lenses.
d. reading glasses.
e. single vision glasses.

Explanation:

The text states that non - prescription lenses are identified with the letters "pl" which is short for "plano".

Answer:

B. nonprescription lenses