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 Mind's Eye & Mission of the Viyrans audio dramas "Urgent Calls", "Urban Myths" and "The Vanity Box". This story marks the first appearance of the Viyrans for Big Finish. They first appeared in the short story "No One Died", also written by Nicholas Briggs, featuring the Tenth Doctor and published in the 2007 Doctor Who Storybook. The Viyrans return against the Sixth Doctor in "Patient Zero". The Mind's Eye & Mission of the Viyrans The Mind's Eye is a Big Finish Productions audio drama based on the long-running British science fiction television series "Doctor Who". It is a three-part story written by Colin Brake and was released