Convex lens use – Glasses
When people have a weakness in the lens of their eye that causes hyperopia, or long-sightedness (the ability to see things in the distance but not close up), they will need spectacles, or glasses. To correct this problem they will need a glass lens which is convex.
In a hypermetropic (longsighted) eye, the image would form behind the retina; instead, an out of focus (blurred) image forms on the retina.
To correct a hypermetropic eye, a convex lens is used to bring the image focused on the retina (the sensory membrane that lines the back of the eye).
Another great use of convex lenses.