Question

convex lens can form inverted image but why we cannot see the inverted image of an object from a convex spectacle..

Answer 1

Yes, you are right our eyes have convex lens and it does form an inverted image on the retina. And we have two retinas, still we see one distinct image and not two. Why ? Because the brain works hard to combine them into a single one. And the same brain make sure you see images not inverted