Both bacterial and viral eye infections are contagious (usually from person to person). The only way to tell the difference between bacterial and viral eye infections is an eye exam from an ophthalmologist.
Most eye infections are viral, and are very infectious.
Bacterial eye infections are less common and are treated with antibiotic drops and pills, and treatment of the underlying cause, such as chronic blepharitis or lid infection.
Viral eye infections are treated with artificial tears, mild steroid drops, and drops to prevent redness and itching. Special care is necessary to avoid giving the infection to others, including careful hand washing, throwing away eye make-up and contaminated contact lenses, and trying not to rub the eyes.
Be careful of "persistent" or "chronic" eye infections — they may be something else entirely, such as chronic inflammation from blepharitis or dry eye.
Don't stay on steroid drops for more than a few weeks. I just saw a patient who had been treated with steroid eye drops for a chronic lid infection from his primary care doctor. The patient wasn't getting better, so he kept re-filling the prescription, and after six weeks of (ineffective) treatment, he had steroid induced glaucoma in both eyes (and a stye which wouldn't go away)
Dementia is a syndrome (a group of related symptoms) associated with an ongoing decline of brain functioning. This may include problems with: memory loss thinking speed mental sharpness and quickness language understanding judgement mood movement difficulties carrying out daily activities There are many different causes of dementia. People often get confused about the difference between Alzheimer's disease and dementia. Alzheimer's disease is a type of dementia and, together with vascular dementia, makes up the vast majority of cases. People with dementia can become apathetic or uninterested in their usual activities, or may have problems controlling their emotions. They may also find social situations challenging and lose interest in socialising. Aspects of their personality may change. A person with dementia may lose empathy (understanding and compassion), they may see or hear things that other people do not (hallucinations). Because people with dementia may lose t...