Measurement of ocular blood flow

Area of Science:

• Ophthalmology
• Medical Imaging
• Vascular Biology

Background:

• Hemodynamic alterations are implicated in various ocular disorders beyond glaucoma, including diabetic retinopathy, macular degeneration, retinal dystrophies, and non-glaucomatous optic neuropathies.
• An improved understanding of ocular vascular anatomy has guided hemodynamic investigations across different ocular vascular beds.

Purpose of the Study:

• To review and critically assess existing techniques for investigating hemodynamic alterations in ocular tissues.
• To highlight the limitations and lack of validation for many current methods.
• To emphasize the need for understanding technique assumptions for future clinical application.

Main Methods:

• Review of existing techniques used for hemodynamic assessment in ocular tissues.
• Discussion of limitations, including reproducibility and accuracy, of these methods.
• Analysis of theoretical assumptions underlying each technique.

Main Results:

• Multiple techniques exist for investigating ocular hemodynamics in diverse conditions.
• No single method provides comprehensive measurements for all ocular tissues.
• Many techniques lack sufficient validation (reproducibility and accuracy) for clinical use.

Conclusions:

• Understanding the limitations and assumptions of hemodynamic measurement techniques is crucial.
• Further validation is required for the prudent clinical application of these methods in ophthalmology.
• Comprehensive hemodynamic assessment across all ocular tissues remains a challenge.