Ophthalmic artery blood flow in humans

In a recent attempt on my part to make sense of many techniques used to study the circulation of the optic nerve, my conclusion was that much work still needs to be done. 1 Harris and colleagues are to be commended for relentlessly struggling to find better ways to determine how blood flow can change under a variety of clinical settings using several techniques, especially colour Doppler imaging. [...]recently, colour Doppler imaging has been limited to visualising blood vessels, identifying direction of blood flow, and calculating blood velocity only.