First Evaluation of a Retinal Imaging Laser Eyewear System Based Low Vision Aid.

Area of Science:

• Ophthalmology
• Optics
• Biomedical Engineering

Background:

• A novel wearable laser-eyewear (LEW) system projects full-color live video onto the retina using a laser and MEMS-mirror.
• This technology aims to provide augmented reality integrated into the wearer's field of vision.
• The system projects thin laser beams via Maxwellian view, designed to be independent of refractive errors.

Purpose of the Study:

• To investigate the performance of the new wearable laser-eyewear (LEW).
• To test the independency of the LEW system from refractive errors in healthy subjects.
• To evaluate visual acuity (VA) with LEW compared to uncorrected and best corrected vision.

Main Methods:

• Twenty healthy subjects (ages 21-60) with various refractive errors (hyperopia, myopia, astigmatism, presbyopia) participated.
• Standardized visual acuity (VA) measurements using ETDRS charts were performed.
• Subjects were tested without correction, with LEW, and with their best correction.

Main Results:

• No significant correlation was found between refraction and VA when using LEW (r=0.17).
• Overall VA with LEW was reduced compared to uncorrected VA (0.50 vs 0.40 logMAR).
• Myopic subjects achieved significantly higher VA with LEW (p<0.001), and presbyopic subjects showed enhanced near VA at 15cm.

Conclusions:

• The LEW system's independence from refractive errors was verified.
• The technology shows promise for patients with corneal conditions, potentially improving VA by reducing light scattering.
• LEW may offer visual benefits for specific patient groups, including those with untreatable corneal opacities.