Elasticity module of contact lenses
The elasticity module is the ability of the material to avoid deformation when it is subjected to tension, that is, the contact lens stays aligned with the surface of the eye.
Clinically, it is important for the following reasons: if it is very low, manipulation is difficult and there is a bad exchange of tears when it blinks; If it is too high, it can cause injuries of mechanical origin to eye.
Hidrogel contact lenses have a low, but correct modulus of elasticity. The first silicone hydrogel lenses were not as comfortable due to this factor. At present, this has been corrected.