PresbyLASIK is a surgical technique for presbyopic visual correction using Excimer

Excimer

An excimer is a short-lived dimeric or heterodimeric molecule formed from two species, at least one of which is in an electronic excited state. Excimers are often diatomic and are composed of two atoms or molecules that would not bond if both were in the ground state. The lifetime of an excimer is...

 LASER ablation.

PresbyLASIK treatment uses the principles of LASIK

LASIK

LASIK or Lasik , commonly referred to simply as laser eye surgery, is a type of refractive surgery for correcting myopia, hyperopia, and astigmatism...

 surgery to create a multifocal corneal surface aimed at reducing near vision spectacle dependence in presbyopic patients. Among the presbyLASIK techniques, the Excimer LASER ablation creates a central area, which is hyperpositive for near vision leaving the midperipheral cornea for far vision.

The first presbyopia treatment with excimer laser was done with the monovision technique LASIK

LASIK

LASIK or Lasik , commonly referred to simply as laser eye surgery, is a type of refractive surgery for correcting myopia, hyperopia, and astigmatism...

. Some authors consider the PresbyLASIK the next step after monovision LASIK

LASIK

LASIK or Lasik , commonly referred to simply as laser eye surgery, is a type of refractive surgery for correcting myopia, hyperopia, and astigmatism...

.

While an overall improvement in visual acuity has been recorded for both near and distance vision, safety and quality of vision have been compromised. It has been reported that 20% of eyes lost two lines of best-corrected visual acuity at distance and 52% of eyes lost two lines of best-corrected visual acuity at near, while only 48% of eyes achieved 20/20 uncorrected visual acuity.