Myelinated Nerve Fibers
Did you mistake these myelinated nerve fibers for cotton wool spots or retinal infiltrates? Many people do. They are whiter, larger and denser than cotton wool spots and are almost always connected to the optic disc. They are unlike retinal infiltrates in having no overlying vitreous haze.
To review the many other yellow-white things in the retina with which you could confuse myelinated nerve fibers, check out Yellow-White Things in the Retina.