Glaucoma is the second leading cause of blindness in the world, and belongs to a group of eye diseases that damage your optic nerve, leading to vision loss. In its early stages, glaucoma may produce no symptoms at all, and it’s estimated that half of the more than 4 million Americans with glaucoma do not even realize they have it.
Optic nerve fibres. Coloured scanning electron micrograph (SEM) of axons from the optic nerve. Connective tissue fibres (thread-like) are also visible. The optic nerve visual information from the retina in the eye to the brain. Magnification: x2000 when printed at 10 centimetres wide.
Retina. SEM of a section through a human retina, the light-sensitive tissue that lines the inside of the eye. Light entering the eye passes through several layers of cells before reaching the light receptors. From top to bottom are seen: cell bodies of optical ganglion cells (pale red), which form the optic nerve; cell bodies of bipolar neurons and cell bodies of the receptor cells (red); and the rod (white) and cone (yellow) receptors. Rod cells different