Contact lenses.

Developments in the materials with which contact lenses are made means that nowadays they can suit almost all patents, whatever their refractive defect.

Presbyopia (tired eyesight in patients older than 40 or 45) can only be corrected with bifocal or multifocal lenses.

Advantages of contact lenses.
Widening of the field of vision because it is not limited by frames. Little alteration in the real dimensions of an object seen by a person. In cases of anisometropia (important differences in graduation between one eye and another), contact lenses are the only way of graduating both eyes with their full refraction. Absence of reflections and aberrations caused by rain, etc. or steaming up because of changes in outside temperature, as happens with the lenses of glasses.

Types of contact lenses.
Lenses permeable to oxygen: these are the lenses to choose when an almost free flow of oxygen is required and in cases of serious astigmatism.
Hydrophilic (soft) lenses:
-for prolonged wear: these are suitable for patients who need to wear them even while sleeping. They require more regular checks by the ophthalmologist.
-for daily use: in this group there are various types, from those that last one or two years to disposable ones (for a day, a month, three months, etc.)..
The choice of the suitable type of lens depends on various aspects evaluated by the ophthalmologist.