Given that large monolens sunglasses have to sit farther away from the face so as to not interfere with the cheeks there is room behind for the corrective inserts. The system is very simple, and basically just involves a second pair of clear corrective lenses that sit behind the main lens, closer to your eyes. If you’re after a more contemporary looking pair of prescription cycling sunglasses then inserts are going to be the way to go. Indirect glaze involves a secondary set of lenses clipped in behind the main lens (Image credit: Will Jones) Prescription Inserts / Indirect Glaze While there’s nothing inherently wrong with a dual lens design, after all it’s what most glasses use, when it comes to cycling sunglasses the trend towards large monolens designs has brought increased protection and a greater field of vision.
If you’re after something like the Oakley Sutro you’re going to need inserts, but if you’re perfectly happy with dual lens designs then there are a myriad of options out there from a wide range of manufacturers. The problem is that, generally speaking, people tend to have one eye worse than the other to some degree, which makes monolens designs impossible to manufacture. While these are a great option if you want to avoid inserts (we’ll get to those shortly), they are limited in the styles you can find them in. At a glance they look like any other pair of sunglasses, and without trying them on you wouldn’t really be able to tell that they’re not. The most subtle option out there is what’s known as Direct Glaze, which is where the lenses of the sunglasses are themselves corrective as well as handling the UV protection. Direct glaze sunglasses look just like any other pair of sunglasses, in this case shown with clear lenses (Image credit: Will Jones) Direct Glaze
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