The present subject matter relates to a non-invasive optical imaging method for monitoring early pathological events specific to Alzheimers disease (AD), such as the development, amount and location of amyloid plaques. The ability to monitor such events provides a basis for, among other things, AD diagnosis, prognosis and assessment of potential therapies. In addition, the present subject matter introduces novel methods for treating AD and retinal ailments associated with AD. Aβ-plaque detection in living brains is extremely limited, especially at high resolution therefore the present invention is based on studies focusing on the eyes as an alternative to brain-derived tissue that can be imaged directly, repetitively and non-invasively.