Table 1.

Study condition, principle of measurement, and main content of the presented methods.

Methods	Study Condition	Principle of Measurement	Main Content
CDI	In vivo	Combination of B-scan ultrasonography with Doppler technology	Anatomical information Blood flow velocity Visualization of blood flow direction
CTA	In vivo	X-rays and advanced computer processing to generate detailed cross-sectional images	Morphological information Determination of vessel diameter
MRI	In vivo	Magnetic field to align the protons within water molecules in the body	Morphological information Determination of vessel diameter Volumetric blood flow Blood flow velocity
Myography	Ex vivo	Ophthalmic artery isolation and measurement of vascular reactivity by transmitted light microscopy	Vessel diameter Vascular reactivity