Answer:
Because amorphous solids are not crystalline and do not distort light.
Step-by-step explanation:
Amorphous solids are that solids in which atoms and molecules are not organised in definite pattern.
Amorphous solids have not ordered internal structure but crystalline solids will have internal planes .In crystalline solids ,internal reflection and refraction can occur.Thus, distorting the light when passing through the crystalline solids.In amorphous, solids have no ordered internal structure therefore, there are no refraction or reflection and hence , no distortion of light.
That is why lenses are made from amorphous solids.