LENS KNOWLEDGE · OPTIONS

Design, material, coating: three different choices.

A lens is a combination of optical design, material and finish. Keeping those choices separate makes product discussions clearer.

1. Optical design

The design determines how the prescription supports the intended viewing tasks. Single vision, progressive and bifocal are different design categories. Personalisation may also use frame and wearing-position information.

2. Material and index

The material contributes to lens thickness, weight and optical properties. Index alone does not determine the final thickness: prescription, frame size, lens shape and centration also matter. Ask for the available material options for the selected design.

3. Coating and treatment

Hard coating, anti-reflection, photochromic behaviour and polarization are different properties. Do not assume that choosing one includes the others or that every combination is available.

A useful order of discussion

1. Understand the viewing task and prescription.
2. Choose the design and frame.
3. Check material and fitting requirements.
4. Confirm the finish, availability and order details.