Setting aside the notion of determining the number of individual animals on the planet for a moment, merely determining the number of species on the Earth is challenging. Science has only been able to offer estimates thus far, and totals vary greatly.
People who have early onset Alzheimer's may be in any stage of dementia â early stage, middle stage or late stage. The disease affects each person differently and symptoms will vary. If you are experiencing memory problems: 1  Have a comprehensive medical evaluation with a doctor who specializes in Alzheimer's disease.
Researchers now view glaucoma as a disease of the brain â a neurodegenerative disease â rather than simply an eye disease. Recent research has shown that the complex connection between the eye and the brain is an important key to the disease. Glaucoma shares a number of features with degenerative brain diseases such as Alzheimerâs, Parkinsonâs, and Lou Gehrigâs disease. In all of these diseases, age and family history are significant risk factors, and specific areas of the brain are damaged over time.