Thinner lenses begin with the frame choice
Prescription, lens material and frame shape work together.
Index is only one part of the story
Higher-index materials can make some prescriptions thinner than lower-index alternatives, but the final result depends on prescription, lens design and the frame. Weight, optical properties, coatings and cost also deserve attention. The highest index is not automatically the best choice.
Frame size changes the result
Larger lens shapes may require more material. Where your eyes sit within the frame also influences the finished lens. A suitably sized frame can sometimes make a more useful difference than choosing a higher-index material alone.
Different prescriptions carry thickness differently
Minus lenses are generally thicker towards the edge; plus lenses are generally thicker towards the centre. Astigmatism and other design choices can change the distribution. A product photograph cannot predict the finished thickness of your prescription lenses.
Compare the complete combination
Bring your prescription and shortlist. Ask the practice to compare suitable materials in the actual frame you prefer, including an estimate of appearance where available. Check durability and suitability for your activities. Do not order solely from an index number or a promise of universally thin lenses.
General information, not an individual diagnosis or prescription. Product suitability and availability are checked in store.