[Presbyopia surgery: principles and current indications].

Presbyopia surgery is not yet a corrective option that can restore effective accommodation, but a compensation option which aims at creating depth of field. Monovision preserves a good close-vision quality for myopes. Multifocality is well tolerated by hyperopes if it is compatible with good far-vision quality. Monovision and multifocality can be applied to surgery by using corneal or intraocular implantation techniques. Presby LASIK and Presbyopic Lens Exchange (PRELEX) are the most effective techniques but they are still controversial. Indications depend on preoperative ametropia and patient age.