Dynamic imaging of accommodation by swept-source anterior segment optical coherence tomography

Area of Science:

• Ophthalmology
• Biomedical Imaging
• Optical Coherence Tomography

Background:

• Understanding the eye's accommodation process is crucial for diagnosing and managing various visual conditions.
• Previous imaging techniques had limitations in real-time, high-resolution assessment of dynamic ocular changes.

Purpose of the Study:

• To investigate the accommodation mechanism in healthy eyes.
• To evaluate the utility of a swept-source anterior segment optical coherence tomography (AS-OCT) system for studying accommodation.

Main Methods:

• Utilized a swept-source AS-OCT (Casia SS-1000) to image the anterior segment of 14 normal eyes.
• Applied varying accommodation stimuli (0-9.0 diopters) and captured real-time, sequential OCT scans.
• Analyzed changes in anterior chamber depth, lens thickness, and lens position during accommodation and disaccommodation.

Main Results:

• Observed statistically significant changes in anterior chamber depth, lens thickness, and lens position during accommodation.
• Found a positive correlation between lens thickness at 0 diopters and subject age.
• Confirmed that central corneal thickness and anterior chamber width remained stable during accommodation.

Conclusions:

• Swept-source AS-OCT provides high-resolution, real-time imaging and biometry of the accommodating anterior segment.
• This clinical system is effective for dynamic analysis of ocular accommodation.
• The findings contribute to a better understanding of the optical and structural dynamics of the human eye during focusing.