If you are wondering what thickness of lenses will be according to your prescription for glasses, then Lens thickness calculator will calculate the thickness of a spherical monofocal lens for you. - 7 different materials with different refractive indices - the ability to know the thickness of the astigmatic lens at any angle of the cylinder - the ability to calculate the thickness taking into account any curvature of the front surface of the lens - the ability to specify any thickness along the