A group of scientists from Duke University (USA) published in the journal "Ophthalmology Retina" the results of studies on the early diagnosis of Alzheimer's disease based on pathological changes in the retina.
The technique is called "optical coherence tomography" - OCTA, it allows doctors to quickly examine the process of blood circulation in tiny capillaries in the back of the retina.
In the course of studies using OCTA, more than 200 people were examined, of whom 133 were healthy, 39 suffered from Alzheimer's disease and 37 had mild cognitive impairments. The greatest attention was paid to the search for retinal degenerations that could be associated with Alzheimer's disease.
Studies have shown that patients with Alzheimer's disease have significantly reduced macular vessel density and perfusion intensity compared to the rest of the participants. This discovery allows the use of OCTA to diagnose this disease at an early stage - even before the first symptoms appear.
The retina of the eye of a healthy person (left) and suffering from Alzheimer's disease (right)