• WordNet 3.6
    • n sclera the whitish fibrous membrane (albuginea) that with the cornea forms the outer covering and protection of the eyeball
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Century Dictionary and Cyclopedia
    • n sclera The sclerotic coat of the eyeball.
    • n sclera The test of the crustaceans, especially those parts of the test which separate the corneal lenses in aggregated schizochroal eyes.
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Chambers's Twentieth Century Dictionary
    • n Sclera sklē′ra the sclerotic coat of the eye-ball
    • adj Sclera relating to such
    • n Sclera the outermost membrane of the eye-ball
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In literature:

The sclera was incised, and, after fourteen years' duration in the eye, the stone was removed.
"Anomalies and Curiosities of Medicine" by George M. Gould
In acute glaucoma the sclera appears to be edematous and slightly thickened.
"Glaucoma" by Various
The eyes may remain open for such long periods of time that the conjunctiva and sclera may become quite dry and ulcerate.
"Benign Stupors" by August Hoch

In science:

This is analyzed with the aid of intense color contrast of the white sclera and black iris which helped in iris detection but due to the presence of eyelid, accuracy is high only for portions that are not covered by the eyelid (in instances of blinking) which is only for horizontal portions.
Eye-GUIDE (Eye-Gaze User Interface Design) Messaging for Physically-Impaired People