Lens Implants: Phakic Lenses

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Phakic lenses offer a promising alternative to the correction of severe to extreme refractive errors while maintaining the accommodation capability of the body's own lens.

Indication
  • Farsightedness from ca. +3 to approx. +8 dpt.
  • Nearsightedness from ca. -10 to approx. -20 dpt.
  • Astigmatism 1,5 to 6 dpt. in combination with near- or farsightedness
Properties
  • good predictability 
  • the correction is performed in the optic axis, between the lens and iris 
  • quick visual rehabilitation 
  • reversible: the lens can be removed
  • enhancement procedure possible by exchanging the lens
  • ambulatory or inpatient surgery 
  • both eyes can undergo the procedure within one or two weeks
Lens implants

Lenses which are implanted without removing the natural lens first, are called "phakic lenses" (phakos [Greek] = the lens). According to their position within the eye, there are anterior chamber lenses (implanted into the anterior eye chamber between cornea and iris) and posterior chamber lenses (between iris and natural lens).

The procedure

The lens implant surgery is performed on an outpatient basis. Prior to surgery, the strength (refractive power) of the additional synthetic lens will be precisely calculated.

The surgery is performed under local anesthesia and sterile conditions and usually takes about 20 minutes.

Implantation of a posterior chamber lens:
First, eye drops are applied to fully dialate the pupil. Next, an approximate 3 - 5 mm wide incision is placed in the periphery of the cornea. The foldable synthetic lens is injected into the anterior eye chamber where it slowly unfolds.

Using an instrument, the surgeon positions the lens between iris and natural lens.

The incision was prepared like a tunnel so that it will close itself at the end of the surgery making a suture unnecessary.

Implantation of an anterior chamber lens:
The course of surgery does not differ much from the implantation of a posterior chamber lens. The only difference is the position of the new synthetic lens: An anterior chamber lens is fixed to the front of the iris so that it covers the pupil. Therefore, the pupil is not dialated before the surgery.

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