Optimization of the Light Sword Lens for Presbyopia Correction

Area of Science:

• Ophthalmology
• Optical Engineering
• Vision Science

Background:

• Presbyopia, an age-related condition, reduces the eye's ability to focus on near objects.
• Light sword lenses (LSLs) are optical elements designed to correct refractive errors.
• Current LSL designs may not offer optimal performance across all visual distances.

Purpose of the Study:

• To modify and evaluate light sword lenses (LSLs) for enhanced distance vision performance.
• To maintain or improve near and intermediate vision with modified LSLs.
• To assess the potential of modified LSLs as presbyopia correctors.

Main Methods:

• Redesigned LSLs with angular or circular windows for distance vision and rescaled profiles for other ranges.
• Numerical simulations (Strehl ratio) and objective experiments (correlation coefficients, Michelson contrast).
• Subjective assessments using visual acuity (VA) and contrast sensitivity (CS) through-focus curves in patients with paralyzed accommodation.

Main Results:

• Modified LSLs demonstrated superior performance for distant object imaging compared to conventional LSLs.
• Angular and radial modulations resulted in flat VA and CS through-focus curves, indicating uniform vision quality.
• Maximal improvement of 1.5 lines of acuity in distance VA was observed with modified LSL profiles.

Conclusions:

• Optimized LSLs provide improved distance vision imaging while maintaining a large depth of focus.
• Modified LSLs offer acceptable and comparable vision quality for distance, intermediate, and near vision.
• The redesigned LSLs show significant promise for presbyopia correction in clinical applications.