Sunglasses Lens Types


Polarising Lenses

Sunglasses with polarising lenses reduce glare, which is caused by reflection.  These types of lenses are ideal for driving and for activities in the snow and in water and sand.  Glare can cause temporary blindness or impair vision and cause eyestrain and headaches.  These lenses have horizontal filtering strips to significantly reduce glare.  Polarised lenses do not necessarily have UV protection and so check this before purchasing.

Photochromic Lenses

These change in colour with the sunlight.  They become darker when outside and lighter in colour inside, where there is little UV light.  Transitional photochromic lenses don't get very dark and take some time to adjust to new light.  Heat prevents transitional photochromic lenses from getting too dark.

Mirrored Lenses

These reflect some or all of the light from the sun, instead of absorbing it like most sunglasses and therefore the eye is exposed to little light.  This makes mirrored lenses ideal for use at high altitudes, for skiers for example.  Mirrored lenses should have a scratch-resistant coating, as they can readily scratch. 

Gradient Lens

Lenses can be dark at the top and lighter at the bottom.  These are ideal for driving for example, because the dashboard can be seen clearly.

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