A stronger prescription deserves a more complete comparison than “I like this frame.” If you are buying without a try-on, the prescription belongs in the frame conversation from the beginning. Do not choose the empty display frame first and leave every lens question for the last screen.
Confirm that the order is within the retailer’s scope
Have the complete current eyeglass prescription available. Ask Fast about suitability for the exact frame, size and intended task if anything is unclear. Fast currently makes single vision glasses; it does not make bifocal, progressive or prism lenses.
Do not remove a prescription instruction or select a different lens purpose to get an order through checkout. If there is an ADD or a conflict between the document and the fields, request review before payment. The review process is a way to resolve a question, not permission to reinterpret the doctor’s instructions yourself.
Compare the frame and lens choice together
Ask how the selected frame, prescription and available material relate to the finished pair. Size can affect the result, but there is no universal shape rule that resolves every individual order. A frame with similar dimensions to your current pair may still have different geometry.
If you compare a standard and an upgraded material, keep the exact frame and prescription constant. Ask what changes in the quote and what the option is intended to offer. “Thinner” is not a complete purchase specification, and a material name alone does not establish the weight or appearance of your finished pair.
Build the budget from the actual configuration
Review the complete price, including any applicable stronger-prescription charge and optional choices. Compare the pair you intend to buy, not the base frame price from one page against an upgraded cart from another.
Fast’s ordering process is easier to judge when the prescription, size, lens options and final total are all visible together. Keep the quote and any support answers. If the practical details remain unresolved, pause before payment. The aim is a deliberate custom order, not an optimistic experiment that depends on changing your mind after the lenses are made.