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.
you are a junior technician at mcg eyeglass recycling center. according to the instructions shown, you should rinse glasses with warm water after:
a. cleaning them with an ultrasonic machine.
b. determining their strength with a lensmeter.
c. recording the prescription on a label.
d. rinsing them with a solution of vinegar and water.
e. washing them with a disinfecting solution.

Explanation:

According to the cleaning process description, after washing the glasses with a disinfecting solution, they should be rinsed with warm water. Then, after rinsing with a vinegar - and - water solution, they are cleaned in an ultrasonic machine and then air - dried and buffed. So, the step after rinsing with warm water is rinsing them with a solution of vinegar and water.

Answer:

D. rinsing them with a solution of vinegar and water