First introduced in 2009, laser blended vision or Presbyond (Carl Zeiss Meditec, Jena, Germany), is now being performed as a technique in presbyopia correction surgery.1-3 Presbyond is a LASIK procedure where enhanced micro-monovision is attained. The dominant eye is corrected for distance vision to almost plano and the non-dominant eye is corrected to be slightly myopic for near vision (up to -1.50DS). The micro-monovision strategy is further enhanced by an increase in the depth of field in each eye using a wavefront optimised ablation. Presbyond laser blended vision is an individualised treatment plan based on pre-operative spherical aberration and the ‘functional’ age of the eye. As a result, a customised fusion of the two images for near and distance vision is created for each patient; a so-called blend zone. Typically, the induced anisometropia is low enough for patients to maintain functional stereoacuity while uncorrected, and to not lose best corrected visual acuity.4
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