Dry eye syndrome is a disease caused by a reduced production of tears (hypolacrymia) or insufficient production of fat (dyslacrimia).
Both hypolacrymia and dyslacrymia are caused by obstruction or malfunction of the meibomian glands which, positioned in the eyelids, are responsible for the production of the lipid layer of tears.
There are 25 to 40 meibomian glands in the upper eyelid and 20 to 30 in the lower eyelid. Their function is to secrete oils which, spreading over the surface of the eye, help to prevent tears from evaporating too quickly.
Phakic lenses are produced in silicone or Collamer that are useful to correct visual defects such as nearsightedness, farsightedness, and astigmatism, even of a high degree (20-25 diopters).
They are positioned both in the anterior chamber (with an angular or iris support) and in the posterior chamber, in contiguity with the natural lens of the eye, which is the crystalline lens and have the function of modifying the path of the light rays and focusing them on the retina.
The type of implanted lens is essential for determining the quality of vision. This is why the use of Visian ICL produced by STAAR Surgical (USA) guarantees the best possible results, allowing the patient to see clearly, with greater depth and field of view.