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LENS DISTORTION, OBJECT SHIFTING & DECENTERED LENSES

Lens distortion is your No.1 enemy particularly in crowded waters because optically incorrect lenses can convince you that you are further away from an object in the water than you really are.

In general terms, the flatter the lens, the less distortion. But as we have noted above flat lenses allow water, direct and reflected light in at the sides, top and bottom which is undesirable. Curved lenses however refract (or distort) the light as it passes through. So for wrap sunglasses it is crucial that the lenses are ‘decentered’ to ensure sharp, distortion free vision throughout the field of view. When a lens is optically decentered, the sweet spot is shifted from the middle of the lens to an optimised position in front of the eye.

Many eyewear brands claim that their lenses are distortion free – but don’t take these claims at face value. If the lenses are not decentered, then ‘object shifting’ could bring you much closer to a collision than you would want. This is especially important if you are moving at high speeds. If you are buying a wrap or ‘8-base’ pair of sunglasses, ask the sales assistant if the lenses are decentered.

Also, visually inspect the lenses to check that the surface has a constant curvature throughout. If the curvature is not uniform, you are likely to experience distortion.

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SET YOUR
SIGHTS HIGHER

Specialist eyewear for watersports enthusiasts.
Stay out there on the water and do what you
love for longer, while also protecting your eyes.

25 / 210 Queen Victoria Street
North Fremantle WA 6159

Pete@lip-sunglasses.com.au

+61 401 835 422

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