Correcting Presbyopia With Autofocusing Liquid-Lens Eyeglasses

Area of Science:

• Ophthalmology
• Biomedical Engineering
• Optics

Background:

• Presbyopia is an age-related loss of the eye's ability to focus on near objects.
• Conventional corrective methods often impair vision by dividing the visual field.
• There is a need for advanced solutions to restore accommodation without compromising visual quality.

Purpose of the Study:

• To design, assemble, and evaluate novel autofocusing eyeglasses.
• To restore accommodative ability in individuals with presbyopia.
• To achieve this without dividing the field of view.

Main Methods:

• The system utilizes adaptive optics with variable-focus liquid lenses and a time-of-flight range sensor.
• Low-power microprocessors control the system within an ergonomic frame.
• Subject-specific accommodation deficiency models were employed for high-fidelity correction.

Main Results:

• Successfully corrected average accommodation deficiencies between -0.021 D and 0.016 D across 5 subjects.
• Achieved correction in approximately 67 ms with low energy consumption (4.86 mJ).
• Demonstrated a restorative accommodative range of 4.3 D with optical resolution of 10.5 cycles/degree.

Conclusions:

• The developed autofocusing eyeglasses effectively restore accommodation in presbyopes.
• The system offers a promising alternative to conventional methods, potentially restoring pre-presbyopic vision.
• The eyeglasses are lightweight, energy-efficient, and provide a wide field of view.