Intrastromal Corneal Inlays maybe useful for Corneal compensation in patient with Presbyopia
Presbyopia is a term used to describe an inability of the human eye to visualize near objects clearly. Normally a human eye visualized the near objects due to the elastic properties of the intraocular crystalline lens.This function is called accommodation.
In Accommodation,the natural crystaline lens changes its length, width and shape in order to focus near objects into the area of central vision of the retina and this help to visualize the near objects. With age the elastic properties of the lens is lost and elderly have difficulties to see the near objects clearly.
For past few years, many new surgical techniques have evolved for treatment of presbyopia. One of them is called as intrastromal corneal inlays. In order to use it as a new presbyopia surgery and treatment ,this corneal inlays is still under investigation under the United States Food and Drug Adminstration (FDA) and is available in the European Union and other markets worldwide.
This inlay is implanted within the corneal stroma. This is accomplished under a LASIK (Laser assisted in-situ keratomileusis) flap, or an intra-stromal pocket created using a femtosecond laser technique.
According to the latest studies, in a clinical trial involving 24 presbyopic patients, after implantation of the intrastromal inlay, it was found that there was a significant improvement in the reading capabilities of these patients. The results were even better than the bilateral intraocular implantation of lenses.
In another study published in the Journal of Refractive Surgery on April 19th, 2012, it was described that 63 patients with presbyopia were studied. All these patients received treatment with the Technolas femtosecond laser.
These patients were followed up at one day, one week, first month, third month, sixth month and twelfth month post operatively.
After one year, 58 of these 63 patients were available for outcome and all of them showed very stable visual acuity after the surgery. The overall patient satisfaction was recorded to be about 80%.
This shows the effectiveness of intrastromal inlays for use in the presbyopic patients as a corneal compensation of their condition. Further studies are still under progress, yet the work done till now has shown rewarding results.