The Giro lenses contain special crystals that darken when exposed to sunlight.
At night they are transparent, but as light intensity increases, the lenses turn darker to protect your eyes and improve your visibility.
The sunnier it is, the faster it darkens.
The Rockbros lenses is made of a composite of Polycarbonate that is able to absorb impact without shattering. It protects you from dust, debris and flying insects.
Lenses made from that material are up to 10x more flexible than ordinary ones and have 100% UV protection built-in.
Polycarbonate is a material used in bulletproof glass, riot shields and astronaut helmets due to its resistance.
Most local opticians are able to craft customs lenses according to your needs, including bifocals, provided that you bring the adapter to them,
Then, you can clip in or remove the adapter into your Tessera90 frame as it better suits you.
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