optical, dispersive prism pairs, anamorphic, retroreflectors ... - prisms optical
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Better still, your eyes will look their natural size instead of being magnified smaller or bigger than they actually are.
Double aspheric lenses use irregular curvatures on both their front and rear surfaces to make them thinner in profile, lighter in weight and aesthetically flatter. These lenses are popular for strong prescriptions to reduce thickness at their centres or edges.
Aspheric or double aspheric lenses have the advantage of being thinner, flatter and lighter weight than traditional spheric equivalents. This makes them easier to wear in your glasses frame with improved aesthetics due to their sleeker appearance.
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Double aspheric lenses are especially beneficial for strong plus (+) prescriptions with Sphere powers of more than +6.00. Due to their curvatures on both the front and rear surfaces, they reduce lens thickness at the centre of the lens and thus the overall weight.
High index lenses are more efficient at refracting (bending) light, therefore require more costly (high index) materials to manufacture. Furthermore, they require finer tolerances of accuracy which adds to their higher production costs. For a guide to high index lenses, check out my other blog here.