The Light Sword Lens for Presbyopia Compensation

The Light Sword Lens - a Novel Method of Presbyopia Compensation: a Pilot Clinical Study

Clinical assessment of a new optical element for presbyopia compensation - the Light Sword Lens.

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.

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.