Abnormal coloring
Redness of the sclera is typically caused by eye irritation causing blood vessels to expand, such as in conjunctivitis ("pink eye"). Episcleritis is a generally benign condition of the episclera causing eye redness. Scleritis is a serious inflammatory disease of the sclera causing redness of the sclera often progressing to purple. Yellowing or a light green color of the sclera is a visual symptom of jaundice. In cases of osteogenesis imperfecta, the sclera may appear to have a blue tint, more pronounced than the slight blue tint seen in children. The blue tint is caused by the showing of the underlying uveal tract (choroid and retinal pigment epithelium). In very rare but severe cases of kidney failure and liver failure, the sclera may turn black. See also
Extraocular implant
Scleral tattooing
Sclerotomy

Notes
References
External links

Histology image: 08008loa – Histology Learning System at Boston University
Atlas image: eye_1 at the University of Michigan Health System—"Sagittal Section Through the Eyeball"
MedlinePlus Encyclopedia: 002295
As the condition tends to get better on its own taking steroids by mouth should generally only be tried if the rash covers a large area and it does not get better with other measures. References
External links

DermNet NZ Archived 2015-08-22 at the Wayback Machine entry