In this video, Dr. Keith Black explains how Longvida, the curcumin of Optim Curcuma, crosses the blood-brain and blood-retina barriers and binds with high affinity to amyloid beta plaque, highly related with the onset of Alzheimer disease.  Curcumin is also a fluorochrome and naturally generates a fluorescent signal, so once bound to the amyloid plaques, the fluorescing curcumin signals are then captured by the retinal imaging device.