Late onset MS is rare and few is known about neuro-retinal degeneration.
OCT is a non-invasive method for measuring neuro-retinal degeneration in vivo.
LOMS eyes display lower retinal layer thickness than healthy controls.
Previous optic neuritis is a main contributor to retinal layer degeneration.
In LOMS, levels of neuro-retinal degeneration are similar to age- or disease duration-matched NOMS.