LASIK Los Angeles, Cataract, Presbyopic Implants, ICL, Pterygium Specialist
Sharing is Seeing



Pi in Eye (Pie) for vision correction

By Rajesh Khanna, MD

What is Lasik?
Lasik eye surgery is one of the top surgical procedures performed today. It has emancipated many people from the visual constraints of contact lenses and eyeglasses. Lasik eye surgery involves the actual re-shaping of the cornea with the use of a cool beam of a laser to permanently correct imperfections of the eye such as nearsightedness, farsightedness and even astigmatism. This common procedure is carried on through a sanitized and clean Lasik suite. Recovery from surgery takes a few days and the touch-up rate is very minimal. History has proven that Lasik is best appropriate for the age groups 18 to 45, since this is where vision is most stable.

Actor Kurt Yaeger with Dr Khanna in Westlake Village_6800379034_l

Shortcomings of Lasik for people above 50
Lasik eye surgery is only capable of delivering one field of vision. Therefore the need for either distance or middle or near is determined before surgery. In younger individuals, the eyes are set for distance and they can conform to or alternate the power of their eyes to see for middle and near. In addition, younger individuals are also able to get over less than perfect results by utilizing their eye muscles. In groups older than forty-five who endure from presbyopia, if the eyes are optimized for distance, they cannot see the other two zones, which are middle and near. If the eyes are optimized for near vision, they will then not be able to see far. With time and aging, the necessity for vision correction with glasses increases even more. Individuals around forty-five to fifty may only require near vision readers and later they may require glasses for the use of computers and phones. Then near the age of sixty, as the lens of the eye experiences changes and the eye muscles are ill-equipped at subduing aberrations, they may even find a need for distance glasses.
Individuals who hope to discard their glasses and desire superior vision at every distance and are not content with Lasik results. Often, blended-vision or mono-vision has been performed to get over this dilemma. In this method, one eye is fixed for distance and the other eye is fixed for middle or near. This seems all well in theory, but in actuality binocularity or depth perception is forfeited. Likewise, intermediate vision may suffer. Also, only about 20% of individuals may even enjoy monovision. Those who don’t like it may get dizziness, jumps in images and disarray. The asset of Pie eye surgery is that all vision, near, middle and far is attained while keeping depth perception. To execute Lasik, a flap in the cornea is designed either by a femtosecond laser or microkeratome. The flap made in Lasik has some disadvantages. It decreases strength of the cornea and hinders with the corneal nerves. Lasik cannot be executed on very thin corneas or atypically shaped corneas for fear of causing the cornea to protrude forward. Also, modification to the central corneal nerves may bring forth dry eyes and make preexisting dryness worsen. Pie surgery can still be performed on thin as well as dry corneas. Another asset of Pie over Lasik is that the center of the cornea is not hindered.

Comparing Pi in Eye and Lasik:

Pi in Eye

  • Distance and near vision
  • permanently glasses free
  • Binocular vision at all distances
  • Thin, thick or Keratoconus cornea
  • Avoids dry eyes
  • Can be performed in extreme nearsighted eyes
  • Can be performed in high hyperopes or farsighted eyes
  • Can be performed over previous Lasik, RK, PRK
  • Prevents future cataracts


  • Distance or near vision
  • Need for glasses by age 45
  • No Binocular vision above age 45
  • Contraindicated for Thin, Thick Corneas
  • Causes Dry Eyes
  • Can not be performed in extreme nearsighted vision
  • Can not be performed in high hyperopes or farsighted eye
  • Avoidance for performance after previous Lasik, RK, PRK
  • Does not prevent future Cataracts
  • Contraindicated in Keratoconus and Pellucidal marginal degeneration.

Following Lasik eye surgery, the vision may fluctuate and decline as the natural lens eye the eye undergoes changes. A individual would then need glasses to see at the particular distance that the vision gets changed. With age a person will most likely develop cataracts and would then need to have cataract surgery. Pie will keep you from a change in vision and development of cataracts by withdrawing the impaired natural lens of the eye. Lasik cannot be done on individuals with high hyperopes or farsighted vision greater than six diopters. The FDA with these vision abnormalities does not authorize Lasik eye surgery. Likewise, high nearsightedness greater than ten diopters makes someone ineligible for Lasik. In these conditions, Pie surgery outperforms Lasik eye surgery. In some particular situations, Lasik may not even be worth considering. For example, if a a 46-year-old individual with low myope and prescription of -1.5 D for distances has Lasik then he or she will still need reading glasses after Lasik. Hence, this person will be just exchanging glasses.

Is Pi in Eye possible after Lasik?

Pi in eye (Pie surgery) can be done after a patient has already had Lasik eye surgery. Although the accuracy of calculations needed for the implant lessens in this instance. After Pie, the flap may collect fluid and slow down healing. A tiny optical zone made by the laser may intervene with the operation of the implant. Many people, however, are happy to have Pie after Lasik. In conclusion, Pi in eye is more beneficial than Lasik for people greater than forty-five and certainly for those above fifty-five. Thus, Pi in eye has also been called as Lasik++.