Alzheimer's disease & dementia

Eye scan sheds new light on Alzheimer's disease

New research by Australian scientists has demonstrated that a quick, non-invasive eye scan can identify changes in the retina that could be used to diagnose Alzheimer's disease.

Medical research

Computer modeling may improve understanding of glaucoma

A new mathematical model may help doctors learn more about the risk factors and causes of glaucoma, including the mechanisms affecting blood flow to the eye. The research will be presented today at the American Physiological ...

Medical research

Relational memory in early psychosis

Relational memory—the ability to form contextual relationships between individual items—is impaired in chronic schizophrenia and has been linked to hippocampal dysfunction. Whether relational memory impairment exists ...

Diseases, Conditions, Syndromes

Cause of congenital nystagmus found

Netherlands Institute for Neuroscience researchers have overturned the long held view that congenital nystagmus, a condition in which eyes make repetitive involuntary movements, is a brain disorder, showing that its cause ...

Ophthalmology

Scientists find cause of debilitating eye disease

Scientists at the Lowy Medical Research Institute (LMRI) have discovered one cause of a progressive, debilitating eye disease called macular telangiectasia type 2 (MacTel). The work, using genetic, clinical and biochemical ...

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Eye

Eyes are organs that detect light, and send signals along the optic nerve to the visual and other areas of the brain[citation needed]. Complex optical systems with resolving power have come in ten fundamentally different forms, and 96% of animal species possess a complex optical system. Image-resolving eyes are present in cnidaria, molluscs, chordates, annelids and arthropods.

The simplest "eyes", such as those in unicellular organisms, do nothing but detect whether the surroundings are light or dark, which is sufficient for the entrainment of circadian rhythms. From more complex eyes, retinal photosensitive ganglion cells send signals along the retinohypothalamic tract to the suprachiasmatic nuclei to effect circadian adjustment.

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