just a means of alleviating those visual defects which cannot be corrected by orthoptic exercises. Some lenses are of better quality and cost more. The frames may contain more gold which makes them wear better, or may have patented features ensuring added service and satisfaction.
MANY DO NOT APPRECIATE DIFFERENCES IN LENS qualities. Not the power or strength, although this does make a difference in the cost, but rather the quality of glass itself and the perfection with which it is ground and polished into lenses. The ethical optometrist uses only first quality lenses but there are second, third or fourth quality which naturally are cheaper.
Text read from the printed page and cleaned; old type leaves the occasional error.