[Correction with contact lenses. The components of correction with contract lenses]

In order to understand the way contact lens adapts, we considered as a necessity the successive analysis of the components participating of the correction. Thus we have presented the role of the cornea and the evolution of the tear film under the contact lens. Afterwards contact lens of different types, corneo-scleral, hard or soft as well as the discontinuous, prolonged and permanent wear of lens have been presented.