Transmission interference microscopy of anterior human eye

Area of Science:

• Ophthalmic imaging
• Microscopy
• Cellular biology

Background:

• Current anterior eye imaging techniques have limited fields of view and contrast.
• Understanding ophthalmic diseases requires high-resolution cellular imaging of the human anterior eye.

Purpose of the Study:

• To apply Ernst Abbe's transmission microscopy principles in vivo for enhanced anterior eye imaging.
• To overcome limitations of existing techniques in field of view and contrast.

Main Methods:

• Illumination projected onto the posterior eye (sclera) to utilize back-reflected light for anterior imaging.
• Tightly localized scleral illumination acts as a closed condenser aperture, enhancing interference contrast.
• Utilized consumer-grade cameras for instrument construction.

Main Results:

• Achieved clear visualization of cells and nerves across all corneal layers within a 2 mm field of view.
• Distinctly resolved crystalline lens epithelial cells, fibers, and sutures.
• Highlighted Fuch's endothelial dystrophy in patients, offering complementary information to reflection contrast.

Conclusions:

• The developed transmission microscopy technique significantly enhances anterior eye imaging capabilities.
• The method provides clear visualization of cellular structures and pathological conditions like Fuch's endothelial dystrophy.
• The instrument's design using consumer-grade cameras facilitates broad adoption for diagnosis and surgical follow-up, especially in low-resource settings.