Younger Optics Trilogy lenses are made of Trivex® - the lightest available optical material.
Its density is 1.11 g/cm3 which is 20% lower than standard 1.50 index lens material. Even for
really high prescription powers, the lightness
of Trilogy® lenses offers unparalleled comfort.
1g per lens

Check your lens weight

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Trilogy 1.50 Polycarbonate 1.60 1.67 1.74
per lens per lens per lens per lens per lens per lens

All weights are based on 1 round lens of 60mm diameter produced with equal 1mm minimum thickness.