Refractive Surgery

Refrative surgeries are chiefly divided into two types

  1. One that works by altering the structure of the cornea
    1. LASIK – Lasik is a procedure in which a flap is created on the cornea and then a specialized excimer laser is delivered on the stroma to alter the shape of the cornea which in turn helps to focus the light clearly on the cornea. It can be further divided into
      1. Standard– In this type of procedure, standard settings to correct the refractive error are used without taking into consideration the higher order aberrations and infact some higher order aberrations can be induced by this procedure resulting in night time glare, haloes etc
      2. Wavefront Customised Aspheric Treatment– This procedure, takes into account the various spherical aberrations produced due to the procedure, whereas the pre existing Higher Order Aberattions are not altered
  • TOPOGUIDED / Contoura – The most advanced treatment is topography guided, in which a lot of points are taken on the cornea and this data is fed into the machine, which helps in reducing the pre existing higher order aberrations as well in addition to correction of the refractive error without inducing any aberrations due to the procedure
  1. Advanced Surface Ablation – In this type of procedure, no flap is created, there is no cut which occurs in the cornea, thereby keeping the cornea strongest amongst all the procedures. This procedure is especially suited for people indulging in sports, defence services, professional fighters, athletes, where there are increased chances of a blow to the eye.
    1. One that works by putting a lens in the eye permanently known as the Implantable Collamer Lens (ICL)- This is a very unique procedure in which a specially designed lens is placed behind the iris and in front of the lens which helps in focusing the light to the retina. It doesn’t involve altering the surface of the cornea thereby giving very crisp vision. Some people even term their vision after ICL as 4K vision due to its clarity and short recovery time.  Since, it is a very delicate procedure, therefore, it should be done only by the doctors who have been specially trained .