Optical coherence tomography of fellow eyes with abnormalities at the vitreoretinal interface, classified according to the morphology and severity of the signal from the visible posterior hyaloid. Top, Severe case: prominent insertion of posterior hyaloid on both sides (superiorly and inferiorly) of the perifoveal region. Middle, Moderate case: prominent insertion of posterior hyaloid on only one side (nasal) of the perifoveal region. There is no distinct point of insertion on the other side (temporal). Bottom, Mild case: a preretinal signal corresponding to the posterior hyaloid is visible inferiorly, but there is no clear point of insertion. No posterior vitreous detachment was found on clinical examination.