To the Editor.
—Kishi and Shimizu1 reported the existence of a "posterior precortical vitreous pocket" in human eyes that they propose represents "a new anatomical and functional concept." Eighty (95%) of the 84 eyes studied were of individuals aged 65 years or older, yet the authors make little reference to the possible effects of aging on the appearance of the eyes, and indeed, on the very existence of this pocket. Worst2(pp2-4) has reported similar findings, although his descriptions differed qualitatively. It is important to emphasize that the findings of Kishi and Shimizu do not constitute a new anatomic structure, but rather a manifestation of vitreous degeneration with age. Substantial liquefaction of the vitreous and formation of pockets of liquid vitreous occur with aging.3 This process actually begins early in life,2 which explains its occurrence in a child.1 Liquefaction begins in the premacular vitreous,2 which explains the
Sebag J. Posterior Precortical Vitreous Pocket. Arch Ophthalmol. 1991;109(8):1059-1060. doi:10.1001/archopht.1991.01080080016006