Bacteria. Bacteria are one-celled organisms visible only with a microscope. They're so small that if you lined up a thousand of them end to end, they could fit across the end of a pencil eraser. Not all bacteria are harmful, and some bacteria that live in your body are helpful.For instance, Lactobacillus acidophilus â a harmless bacterium that resides in your intestines â helps you digest food, destroys some disease-causing organisms and provides nutrients.acteria are one-celled organisms visible only with a microscope. They're so small that if you lined up a thousand of them end to end, they could fit across the end of a pencil eraser. Not all bacteria are harmful, and some bacteria that live in your body are helpful.
Optic atrophy is the final common morphologic endpoint of any disease process that causes axon degeneration in the retinogeniculate pathway. Clinically, optic atrophy manifests as changes in the color and the structure of the optic disc associated with variable degrees of visual dysfunction. Optic atrophy is actually a misnomer; in the strict histologic definition, atrophy refers to involution of a structure resulting from prolonged disuse.
There are a number of signs that are atypical of optic neuritis and their presence should alert ophthalmologists to diagnose other than inflammatory demyelination, such as optic atrophy on presentation, severe disk oedema with vitreous reaction, optic disk hemorrhage, painless loss of vision, and lack of signs of recovery within 3 weeks of onset of symptoms (107).