Sclera nitrogenous sugar, hexosamine) to embed the fibrils. The cornea, unlike the sclera, has five layers. The middle, thickest layer is also called the stroma. The sclera, like the cornea, contains a basal endothelium, above which there is the lamina fusca, containing a high count of pigment cells. Sometimes, very small gray-blue spots can appear on the sclera, a harmless condition called scleral melanocytosis. Human eyes are somewhat distinctive in the animal kingdom in that the sclera is very plainly visible whenever the eye is open. This is not just due to the white colour of the human sclera, which many
The Eye of the Sibyl The Eye of the Sibyl "The Eye of the Sibyl" is a science fiction short story by American writer Philip K. Dick. It was written sometime around 1975, but not published until 1987 when it was included in volume 5 (subtitled "The Little Black Box") of "The Collected Stories of Philip K. Dick", and has been reprinted since in other editions of this book such as the U.S. edition "The Eye of the Sibyl and Other Stories" . This is said to have been Dick's first piece of fiction for publication after his "2-3-74" experience that was the basis for