why can’t glasses be made of the same material as used in contact lenses? They wouldn’t break so easily

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I’m genuinely curious. Is it about the shape, durability or something else?

In: Engineering

Materials behave differently in different thicknesses. Farther from the eye you need a different refractive index for the lense to focus the picture correctly so much different shape with the same material. But apart from that contact lenses need moisture to stay flexible and good. It would be hard to achievs for glasses to be constantly moistured.

Gel lenses have to continuously be immersed in fluid or they will dry out. Soft plastic lenses will scratch after the first cleaning attempt.

>why can’t glasses be made of the same material as used in contact lenses? They wouldn’t break so easily

This is the first time I hear about lenses breaking *easily*. If they’re thin glass lenses you’d have to work **really** hard to shatter them. Any kind of similar force would easily destroy any other kind of lense as well. Glass is extremely hard.