The Light Sword Lens - a Novel Method of Presbyopia Compensation: a Pilot Clinical Study
Trial Snapshot
- Phase
- Not Applicable
- Status
- Completed
- Sponsor
- Enrollment
- 34
- Primary Endpoint
- Visual Acuity based on The Early Treatment Diabetic Retinopathy Study protocol
Study Overview
Brief Summary
Clinical assessment of a new optical element for presbyopia compensation - the Light Sword Lens.
Detailed Description
Healthy dominant eyes of presbyopes were examined for visual performance. The examination was performed in the ophthalmic trial frame, which included assessment of 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.
Study Design
- Study Type
- Interventional
- Allocation
- Na
- Intervention Model
- Single Group
- Primary Purpose
- Treatment
- Masking
- None
Eligibility Criteria
- Ages
- 45 Years to — (Adult, Older Adult)
- Sex
- All
- Accepts Healthy Volunteers
- Yes
Inclusion Criteria
- •emmetropic or hyperopic eyes with a spherical error of maximum +1.75D and astigmatism of ≤ 0.5D.
- •Corrected distance visual acuity (CDVA) had to be better than 0.1 logMAR (20/25) and at the same time contrast sensitivity (CS) could not be less than 1.9 logCS. -Uncorrected near visual acuity was required to be worse than 0.4 logMAR (20/50), as a proof of presbyopia.
Exclusion Criteria
- •any history of ophthalmic surgeries
- •evidence of serious ocular or brain pathologies affecting visual acuity (VA)
- •clinically active inflammation.
Outcomes
Primary Outcomes
Visual Acuity based on The Early Treatment Diabetic Retinopathy Study protocol
Time Frame: day one
Examination 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 assessment in 7 tasks for defocus from 0.2D to 3.0D. The degree of homogeneity through defocus was determined. Reference and stenopeic trials were compared to Light Sword Lens results. Statistical analysis: Friedman analysis of variance, Nemenyi post-hoc, Wilcoxon tests , p-value \< 0.05 is considered significant.
Contrast sensitivity based on Pelli-Robson method
Time Frame: day one
Contrast sensitivity assessment in 2 tasks for defocus 0.3D and 2.5D The degree of homogeneity through defocus was determined. Reference and stenopeic trials were compared to Light Sword Lens results. Statistical analysis: Friedman analysis of variance, Nemenyi post-hoc, Wilcoxon tests , p-value \< 0.05 is considered significant.
Secondary Outcomes
No secondary outcomes reported
Investigators
Marek Rekas
Professor
Military Institute od Medicine National Research Institute