Wrap a stack of tortillas in damp paper towels or a damp kitchen towel, then wrap in plastic wrap or place in a microwave-safe resealable plastic bag (keep the bag open to vent). Microwave until warm and flexible, about 1 minute. (Photograph by Christopher Testani).
The sclera is the part of the eye commonly known as the âwhite.â It forms the supporting wall of the eyeball, and is continuous with the clear cornea. The sclera is covered by the conjunctiva, a clear mucus membrane that helps lubricate the eye. It is thickest in the area surrounding the optic nerve.
In humans the whole sclera is white, contrasting with the coloured iris, but in other mammals the visible part of the sclera matches the colour of the iris, so the white part does not normally show. In the development of the embryo, the sclera is derived from the neural crest.In children, it is thinner and shows some of the underlying pigment, appearing slightly blue.he thickness of the sclera varies from 1mm at the posterior pole to 0.3 mm just behind the rectus muscle insertions. The sclera's blood vessels are mainly on the surface. Along with the vessels of the conjunctiva (which is a thin layer covering the sclera), those in the episclera render the inflamed eye bright red.