The convex lens is a lens that converges rays of light that convey parallel to its principal axis (i.e. converges the incident rays towards the principal axis) which is relatively thick across the middle and thin at the lower and upper edges. The edges are curved outward rather than inward. It is used in front of the eye bends the incoming light sharply so the focal point shortens and the light focuses properly on the retina.
1. When the object is at infinity then convex lens forms the image at focus which is real and inverted.