The scleral contact goes over the whole front eye. Corneal contacts are small and light. Corneal contact lenses are the most popular contact. These contacts do not restrict your vision. They move with the eye.
Haptic lenses are thick and are held in place by the eyelids.
These lenses are worn by people in sporting events because they do not pop out as easily. Also people who have diseased or damaged eyes wear the haptic contacts. Most people that wear contact lenses wear them for cosmetic reasons. Some types of vision corrections are best done with contact lenses. Those people have to have a concave and a convex lens.