WASCA (Wavefront Aberration Supported Cornea Ablation) is a method for wavefront-guided ablation. This new method records all existing eye aberrations with the Asclepion Wavefront Aberrometer and calculates the customized pattern for laser correction. We measured the low and high order aberrations of eyes before and after Lasik and Epilasik, as well as before and after flap creation.

Natural examples of aberrations are the way car and street lights can seem to have a halo, starburst or surrounding fringe around them at night. Aberrations are related to quality of the light which is focused on to the retina and subsequently the quality of vision you experience. Once measured, the aberration profile is incorporated into the programming of the Excimer laser to deliver you a more precise result and, ultimately, better vision. Improved night vision and reduced glare, in particular.

Refractive Errors and Treatment
  • Zeiss Mel-80
  • Visumax
  • Zeiss Topography
  • Aberrometer
  • Visante OCT
  • Pachymetery
  • ORA
What is Refractive Error?
The function of the eye is to see clearly the objects around us. The inability of the eye to accurately focus the rays of light coming from distance on the retina is called refractive error. This condition may be either because the eye is too short or long in length, or because the cornea or lens does not have the required refractive power. There are three types of refractive errors:

Myopia (near-sight):
this is the condition in which the eye is too long and the light is focused in front of the retina. Distant objects are blurred but the near objects are seen clearly. The eye has too much optical power and to correct it the optical power is reduced by either minus glasses or contact lenses, or by surgery.

Hypermetropia (long-sight):
this is the condition in which the eye is too short and the light is focused behind the retina. The eye has less optical power than is needed. When young the eye can use the lens within the eye to compensate, but reading glasses are needed at a relatively early age. Later, distance glasses (plus) are needed as well, such that glasses for distance and near are required.

this is the condition where the eye does not focus the light evenly, usually due to the cornea of the eye being more curved in one direction than the other. It may occur on its own or may be associated with myopia or hypermetropia.

What is Presbyopia?
Presbyopia is the normal aging process, where the lens progressively loses its capacity to increase its power for near vision (loss of accommodation). The distance vision may be normal, but the near vision becomes blurred with age greater than about 45 years. This is corrected by wearing reading glasses (plus) for the near work. This condition may occur in itself or may be present alongwith pre-existing myopia, hypermetropia or astigmatism.

What are the ways of treating refractive errors?

The refractive errors may be treated by either of the following ways:
  • Glasses : this is the simplest and most popular way of correcting refractive errors
    Contact lens: this option is cosmetically much better though the maintenance and cleaning of contact lenses may be cumbersome. There is also a slight risk of infection to the cornea, if the contact lenses are not cleaned properly before use.
    Refractive surgeries: these are increasingly becoming popular with the advent of more predictable laser treatments.
  • Monovision : An alternative way to deal with presbyopia is called monovision. In monovision, your dominant eye is given a distance prescription, while your other eye is given a near prescription. Contact lens practitioners have used monovision for years. Refractive surgeons use it as well. While monovision can decrease your need for reading glasses, it can take some getting used to. Monovision can hinder depth perception, and you may not feel comfortable driving or reading for extended periods without glasses to bring both your eyes into optimal focus. If you've never experienced monovision, try it with contact lenses first to make sure you're comfortable with it. If you are, your eye surgeon can give you permanent monovision LASIK or other refractive surgery.
  • Phakic IOL (ICL) : Putting an additional artificial lens within the eye on top of the existing natural lens is called Phakic IOLThe ICL (Implantable Collamer Lens) is one of the latest technological advancements in vision correction. The ICL is a long lasting solution for refractive error. Through its myopia treatment, the ICL offers excellent quality of vision.
  • Removing the natural lens : Removing the natural lens and replacing it with an artificial lens of adequate power: it is similar to a routine phacoemulsification surgery, except that it is done in a clear lens and not a lens with cataract.