Not sure what the different kinds of contact lenses are and what purpose they serve?
Generally, the most common categorization of contact lenses is by the replacement schedule, that is, how often you change your lenses. Older generation, conventional contact lenses usually follow a long replacement schedule of a year or more, whereas the new generation contact lenses are more frequently replaced. Nowadays, other things, like material of lens, are also important considerations in differentiating the contact lenses.
Here is a quick guide on contact lenses and how they can suit your needs.
