The bottom photograph is of a normal optic nerve.  the top four demonstrate myelinated nerve fibers.   Nerve fibers are usually insulated with myelin, that aids in transmission of nerve impulses.  Usually this insulation ends as the fibers enter the eyeball.  But occasionally, as is the case below, the insulation will continue, and you can see it as the white.   These usually have no negative consequence to vision or the eye. 

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