Two-Photon Imaging for Non-Invasive Corneal Examination.

Area of Science:

• Biomedical Optics
• Microscopy Techniques
• Ophthalmology Imaging

Background:

• Two-photon imaging (TPI) modalities like TPEF, FLIM, and SHG provide multi-modal contrast for biological tissue examination.
• The cornea's transparency, collagen content, and cellular structure make it suitable for TPI analysis.
• TPI offers complementary information to existing clinical devices for corneal assessment.

Purpose of the Study:

• To review the principles, instrumentation, and advancements in TPI for biological tissue imaging.
• To highlight the application of TPI in retrieving unique information from the cornea.
• To discuss the current status and future prospects of clinical TPI for the human cornea.

Main Methods:

• Discussion of physical principles and instrumentation of TPI modalities (TPEF, FLIM, SHG).
• Overview of recent advances in TPI instrumentation and image analysis techniques.
• Review of studies applying TPI to corneal tissue examination.

Main Results:

• TPI modalities provide complementary data on corneal morphology, metabolism, and structure.
• TPI enables detailed analysis of corneal layers and collagen organization.
• Current TPI applications offer insights beyond conventional clinical imaging.

Conclusions:

• TPI is a powerful tool for detailed corneal investigation, complementing clinical diagnostics.
• Further development in instrumentation and analysis is needed to overcome obstacles for clinical translation.
• Clinical TPI holds significant promise for enhanced human cornea examination and diagnosis.