Alens that is thicker in the center than at the edges is called a (concave, convex) lens.

convex lens

A convex lens is thinner at the edges and thicker towards the center.

It spreads light rays apart producing an image smaller than the actual object. Nearsighted people (people who see close objects fine but distant objects appear blurry) have concave lenses in their glasses to correct their vision.

Convex lens is the right answer since it is thicker in the center while concave is thinner in the center