Head-mounted adaptive optics visual simulator

Area of Science:

• Ophthalmology
• Optical Engineering
• Vision Science

Background:

• Adaptive optics (AO) systems are crucial for vision testing.
• Current AO simulators are either fixed or offer limited wearable correction (e.g., defocus).
• A need exists for advanced, wearable AO simulators for comprehensive ocular aberration assessment.

Purpose of the Study:

• To develop and evaluate a novel head-mounted adaptive optics visual simulator.
• To enable real-time measurement and modification of complex ocular aberrations.
• To assess the device's performance in correcting various visual aberrations.

Main Methods:

• A wearable headset integrating two optical modules: one for aberration assessment and one for wavefront modulation.
• Utilized a microdisplay, liquid crystal on silicon (LCoS) spatial light modulator, and Hartmann-Shack wavefront sensor.
• Miniaturized components, optical path folding, and 3D printed parts for compact design.
• Calibration and performance analysis using an artificial eye and real-eye tests.

Main Results:

• Accurate measurement and compensation of induced defocus, astigmatism, and higher-order aberrations.
• Achieved post-correction resolution up to 37.5 cycles/degree (Visual Acuity 1.25) via Modulation Transfer Function (MTF) analysis.
• Subjective tests confirmed defocus curve matching with commercial desktop simulators.

Conclusions:

• The developed head-mounted AO visual simulator is a compact and effective tool for vision testing.
• It accurately measures and corrects complex ocular aberrations in real-time.
• The device shows potential for advanced vision evaluation and rehabilitation applications.