Lenses and coatings

Lens index decides how thin a lens can be, and coatings decide how it handles reflections, scratches and smudges. Your prescription, frame size and centration matter as much as the index you pick.

Metal glasses on a dark surface with light reflecting across the lenses — Photo: Ro han / Pexels

Illustrative minus-lens cross-sections for indexes 1.57, 1.61 / 1.61 Pro, 1.67 and 1.74. Higher index can reduce edge thickness with other variables fixed; not to scale.

Index is only one part of thickness

Index describes how strongly a material bends light. With the same prescription and frame, a higher index gives a thinner lens. Frame size counts too: a smaller, well-centred frame often makes a bigger difference than moving up an index.

Index	What to consider
1.57	An entry option for mild prescriptions; suitability depends on prescription and frame.
1.61 / 1.61 Pro	A thinner option for moderate prescriptions; compare material and design as well as price.
1.67 / 1.67 Pro	Often chosen for stronger prescriptions where edge thickness shows.
1.74	The thinnest option here; not automatically the best optical or weight choice.

Coatings are separate choices

Anti-reflective coatings cut reflections from lights and screens, so others see your eyes rather than glare. Hard coatings improve scratch resistance but do not make a lens scratch-proof. Water-repellent finishes make cleaning easier.

Caring for coated lenses

Coatings last longer with gentle care. Rinse with lukewarm water before wiping, use a drop of mild soap, and dry with a clean microfibre cloth. Avoid hot water, household glass cleaners and leaving glasses on a car dashboard in the sun, which can craze a coating over time.

Frame size guide

Smaller frames, thinner edges.

Blue-light lenses

A filter, with realistic expectations.

Rimless glasses

Frames that show the lens edge.

Index and coating questions

Which index do I need?

There is no universal cutoff. The lens step shows which indexes are offered for the prescription you enter.

Will a high index lens be lighter?

Usually thinner, and often a little lighter, but frame size and lens design matter as much.

How do I clean coated lenses?

Rinse with lukewarm water, use a drop of mild soap and dry with a clean microfibre cloth. Avoid paper towels and clothing.

Find your next frame

Compare shapes and measurements, then explore suitable lens options.

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