What Is It
Presbyopia is a defect of the focalization of nearby images. It is dependent on the physiological aging of the eye tissue: the function of “accommodation”, i.e. the ability of the crystalline lens to get images into focus at a distance of 30-50 cm, becomes less efficient. This visual defect can affect anyone and usually occurs after 45 years of age. Without glasses it becomes difficult to read, dial telephone numbers, use the computer or carry out ordinary activities that require near vision. Everything is even more problematic if you are already using glasses to correct myopia, hypermetropia or astigmatism because you have to resort to two sets of glasses or multifocal lenses, which are not suitable for everybody.
What Causes Presbyopia
Presbyopia is not a refractive defect but a normal and physiological condition of the eye that affects everyone and typically occurs after 45 years of age. This is due to a decrease of the accommodation power of the eye below 4 diopters that is caused by a progressive stiffening of the lens. With the passing of years, the crystalline lens loses its elasticity and progressively fails to achieve the necessary curvature to allow the focus of nearby objects, which consequently appear blurry.
How Is Presbyopia Treated
Laser therapy is undoubtedly the future in this field because the latest technologies allow for operations with extreme precision. At our center, the only program that obtained the CE trademark to correct presbyopia, together with the correction of a refractive defect, is now available. The laser procedure is called SUPRACOR and is quick, safe, and effective.
The operation is composed of two different phases:
- the creation of superficial corneal flap using the femtosecond laser,
- the reshaping of the corneal curvature with the excimer laser, by creating a small multifocal structure on the central corneal surface that allows for focus while reading, without needing to use glasses.
Patient Selection Is Very Strict
Indeed, not every candidate is fit for the operation since many aspects and anatomical features of the cornea and the eyeball need to be taken into account.