Progressive lenses are a special case. These lenses are manufactured with significant distortions resulting from the blending needed to eliminate the bifocal lines. If the customer is not able to adapt to these lenses the company will replace them with any other lenses at no additional charge within 60 days. High index lenses are made with plastics having significant distortions. These are inherent in the materials and are the state of the industry's ability to produce thinner lenses.
Stronger prescriptions have stronger distortions because of the abundance of material.
If the customer cannot adapt to these lenses the company will accept a new order at half price. Index Seven Eyeglasses are made using standard CR-39 plastic which is the best material available for plastic lenses and is the standard of the industry worldwide today. These lenses have reduced thickness in harmony with their name using special grinding techniques and careful frame selection in each case. In the event that the customer is not happy with their frame selection the company will accept a new order at half price. Cancellations and changes cannot be accepted once the order has been entered into process.