Abstract
PurposeClinical assessment of a new optical element for presbyopia correction–the Light Sword Lens.MethodsHealthy dominant eyes of 34 presbyopes were examined for visual performance in 3 trials: reference (with lens for distance correction); stenopeic (distance correction with a pinhole ϕ = 1.25 mm) and Light Sword Lens (distance correction with a Light Sword Lens). In each trial, visual acuity was assessed in 7 tasks for defocus from 0.2D to 3.0D while contrast sensitivity in 2 tasks for defocus 0.3D and 2.5D. The Early Treatment Diabetic Retinopathy Study protocol and Pelli-Robson method were applied. Within visual acuity and contrast sensitivity results degree of homogeneity through defocus was determined. Reference and stenopeic trials were compared to Light Sword Lens results. Friedman analysis of variance, Nemenyi post-hoc, Wilcoxon tests were used, p-value < 0.05 was considered significant.ResultsIn Light Sword Lens trial visual acuity was stable in tested defocus range [20/25–20/32], Stenopeic trial exhibited a limited range of degradation [20/25–20/40]. Light Sword Lens and reference trials contrast sensitivity was high [1.9–2.0 logCS] for both defocus cases, but low in stenopeic condition [1.5–1.7 logCS]. Between-trials comparisons of visual acuity results showed significant differences only for Light Sword Lens versus reference trials and in contrast sensitivity only for Light Sword Lens versus stenopeic trials.ConclusionsVisual acuity achieved with Light Sword Lens correction in presbyopic eye is comparable to stenopeic but exhibits none significant loss in contrast sensitivity. Such correction method seems to be very promising for novel contact lenses and intraocular lenses design.
Highlights
Nowadays presbyopia is a genuine problem of the world’s population
The Light Sword Lens - A novel method of presbyopia compensation la Tecnologıa y la Innovacion Francisco Josede Caldas, Colombia (COLCIENCIAS, http://www. colciencias.gov.co/node/1434) grant FP44842023-2015 (AMA); the National Science Centre, Poland (Narodowe Centrum Nauki, https://ncn.gov. pl/?language=en) under a grant 2015/19/N/ST2/ 01679 (KK). All those supporting sources had no involvement in study design; collection, analysis, and interpretation of data; writing the report; and the decision to submit the report for publication
Another approach consists of refractive elements with angularly varying optical power, termed Light Sword Lenses (LSLs), [7,8,9] which are subject of this study
Summary
Nowadays presbyopia is a genuine problem of the world’s population. There are over 900 million people aged 60 or more all over the world, and this number is expected to rise one and half times within the 15 years. [1] Prolongation of the working age in the context of aging of the human eye, requires compensation of accommodation mechanism by correction with artificial lenses (or systems) enabling good quality of vision at all functional distances. [2] There are various spectacles designs and contact (CL) or intraocular (IOL) lenses for compensation of presbyopia due to aging or as a consequence of cataract surgery. [3, 4] Multifocal CLs and IOLs with symmetry of revolution are the most widespread and frequently used e.g. CL: Acuvue Oasys for Presbyopia (Johnson & Johnson), Biofinity Multifocal (Cooper Vision), Dailies AquaComfort Plus (Alcon), IOL: Alcon Panoptix (Alcon), Tecnis Symfony (Abbott Medical Optics). Symmetry of revolution means that their shape is fully defined by one crosssection through the center [5, 6] due to placement of annular areas of disparate power in the center and periphery or some set of diffractive rings Another approach consists of refractive elements with angularly varying optical power, termed Light Sword Lenses (LSLs), [7,8,9] which are subject of this study. Recent simulations and experimental results, performed with the help of the optical system of the artificial eye imitating the presbyopic human eye, show that the LSL light focusing properties make possible formation of images for objects located at a wide range of distances from 25–33 cm to infinity These images exhibit consistently good quality with an acceptable contrast. Visual acuity of 11 subjects with drug-induced cycloplegia was measured using a simulator of monocular vision. [16]
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