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how the use of an ellipsoidal surface enables post-cataract lenses to be made free from Oblique Astigmatism

advantages of using a convex aspherical surface for a +4.00D lens instead of a traditional surface

what it mean by blended lenticular lens?

The lens, –1.75DS / +1.75DC × 180 is made in glass, n = 1.56, in toric form
with a –4.00D base curve and edged 40mm round. The thick-edge thickness
is 3.14mm. What is the thin-edge substance of the...