In the case of Myopia, we wear which kind of lens?

A concave lens, also known as a diverging lens, is used to correct myopia or short-sightedness. 

When a concave lens is placed in front of the eye, it causes the light rays entering the eye to diverge more, compensating for the excessive curvature of the cornea or length of the eyeball. This allows the light to focus properly on the retina, improving distant vision for the person with myopia.