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it is durable and the material is somewhat cost-effective.
Because the material properties are suitable, weight, springiness, slick surfaces, strength etc.
The material properties are suitable for the purpose,(color, shape, corrosion resistant....) and they're cheap to make.
Eyeglass lenses could be made of nearly any plastic or glass. For example, some glasses lens, such as my own, are made of a plastic called polycarbonate which is the material used to make bulletproof glass so my glasses are impact resistant. Other eyeglass lenses can be made from other plastics and glasses such as CR-39, Homopolyer and crown glass.
According to Wikipedia, today's lenses are typically made from plastic, such as polycarbonate. Plastic is used in order to lessen the chance of breakage.
Rimless eyeglass frames are frames where there is no plastic or metal rim around all or part of the lens. The lenses are held in place by a transparent nylon string that is very similar to tautened fishing line. The advantage of rimless eyeglass frames is that they tend to be lightweight and have a subtle appearance.
because it is
PLASTIC
Chlorophyll would not be suitable as a plastic pigment.
they are light and flexible
you need to make some milkos by staying on the computer for a few hours then feed them to your babies
Generally from ABS (Acrylonitrile butadiene styrene)