in a robust hard shell case. Note: The distance values should lie within a range of ± 1 dpt (sphere, cylinder). (In the case of greater variances in distance values, we recommend that the prismatic

in a robust hard shell case. Note: The distance values should lie within a range of ± 1 dpt (sphere, cylinder). (In the case of greater variances in distance values, we recommend that the prismatic

an aspheric lens? An aspheric lens has a refractive surface geometry which is not in the form of a sphere. The image quality is significantly improved in comparison to simple spherical lenses and aberrations