Analysis of effective range of focus after laser scleral microporation in presbyopic eyes
First Author: K.Rocha USA
Co Author(s): A. Hipsley D. Ma R. Ang M. Jackson B. Hall
To evaluate changes in effective range of focus in presbyopic eyes after Laser Scleral Microporation (LSM).
Subjects were enrolled in an early feasibility study to evaluate the safety and efficacy of the Laser Scleral Microporation (LSM) to resore effective range of focus, true accommodation, and pseudoaccommodation.
An Er:YAG laser was used in 4 quadrants on the sclera to improve pliability & biomechanical efficiency of the ciliary muscles in 5 critical zones in 40 eyes of 20 patients. Ray-tracing aberrometer and double-pass wavefront were used to objectively measure visual acuity, higher-order aberrations (HOA), depth of focus (DoF), the visual Strehl ratio based upon the optical transfer function (VSOTF), true accommodation, pseudoaccommodation, and the effective range of focus.
Ray-tracing technology can objectively measure dynamic accommodation as well as specific lens behavior. LSM provided improvement in both accommodative ability and near visual acuity. Early results demonstrate that patients received up to 1D in improvement in true accommodation at 1 month postoperatively. Positive changes after the LSM procedure were also seen in both spherical aberration and DoF. Pseudoaccommodation from changes in spherical aberration and increased depth of focus may contribute to near vision functionality.
Early clinical trial results suggest LSM to be a safe and effective procedure for restoring range of visual performance in presbyopes. Early results also suggest that LSM can improve intermediate and near visual acuity without touching the visual axis. Data collection is ongoing.
receives consulting fees, retainer, or contract payments from a company producing, developing or supplying the product or procedure presented