High loop rate adaptive optics flood illumination ophthalmoscope with structured illumination capability

Area of Science:

• Ophthalmic imaging
• Biomedical optics
• Retinal imaging technology

Background:

• Adaptive optics (AO) systems enhance optical imaging quality.
• Flood illumination ophthalmoscopes offer wide-field retinal views.
• Dynamic aberrations and eye motion challenge high-resolution ophthalmic imaging.

Purpose of the Study:

• To design and evaluate an adaptive optics flood illumination ophthalmoscope (AO-FIO) platform.
• To analyze eye motion and dynamic aberrations for system optimization.
• To achieve high-resolution, high-contrast, and distortionless retinal imaging.

Main Methods:

• Development of a custom real-time controller for AO loop rates up to 70 Hz.
• Implementation of AO-corrected illumination for projecting high-resolution retinal features.
• Acquisition of wide-field (2.7°×5.4°) retinal images with enhanced signal-to-noise ratio.
• High spatial and temporal resolution imaging (up to 200 Hz) for dynamic processes.

Main Results:

• The AO-FIO platform achieved jitter-free operation at 70 Hz loop rate.
• High-resolution, distortionless images of retinal vasculature and lamina cribrosa were obtained.
• Enhanced contrast and signal-to-noise ratio were achieved through precise AO parameter control.
• Visualization of vessel deformation and blood flow dynamics was enabled by high spatio-temporal resolution.

Conclusions:

• The developed AO-FIO platform offers significant improvements in retinal imaging quality and speed.
• The system demonstrates the potential for flood illumination AO systems to regain prominence.
• Exploiting high pixel rate and structured illumination capabilities can further advance AO ophthalmoscopy.