The lenses used to fill the prescription in the free pair are often cheap, uncoated lenses. Is the optical giving away a free pair?
Not really! The store makes money from this promotion by encouraging the consumer to purchase an ‘add-on’ package of coatings. These coatings are scratch protection, ultraviolet coating and a tint. A total for all three options may cost you from $29 to $59. So the optical will make anywhere from $23 to $53 on your FREE pair! In reality, you are overpaying for your first pair and getting a poor quality frame for the second pair.