Ordinarily nerve fibers have insulation around them, just like electrical wires need insulation. This insulation is called myelin. But when the nerve fibers enter the eye they ordinarily become demyelinated. Very occasionally, a patient will have myelination on some retinal nerve fibers. This is harmless and non-progressive but interesting. The photo below is probably the most myelinated retinal nerve fibers I've noticed in 23 years of practice. So I thought I'd post it.
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