All 200 or so species of primates have dark eyes and a barely visible sclera.
From the post-gazette.com
Because the muscles can be attached to the sclera, it allows synchronized movement.
From the omaha.com
Dominant fish had light, cream-coloured sclera that only darkened if they fell ill.
From the newscientist.com
Short-sightedness is caused by elongation of the eye's outermost tissue, the sclera.
From the newscientist.com
The sclera should have borne the label of the conjunctiva, and vice versa.
From the newscientist.com
The sclera, a tissue donation, is used to attach the muscles of the eye to the implant.
From the omaha.com
Low-status fish had dark sclera that lightened only after they ate a meal or won a battle.
From the newscientist.com
The white outer area is the sclera, the central transparent part of which is the cornea.
From the en.wikipedia.org
His eyes, their altitude-wrecked sclera as red as merlot, narrowed.
From the nytimes.com
More examples
The whitish fibrous membrane (albuginea) that with the cornea forms the outer covering and protection of the eyeball
The white visible portion of the eyeball. The muscles that move the eyeball are attached to the sclera.
The part of the eye around the colored pupil commonly referred to as "the whites of the eyes." Some, not all, people with OI appear to have a blue, purple or gray tint to their sclera. The color may range from barely noticeable to very dark and may change with age.
Greek skleros = hard; hence the tough, outer layer of the eyeball; adjective - scleral.
A tough, white covering over most of the eye. Sclera protects your eyeball and helps form its round shape.
The dense fibrous opaque white outer coat enclosing the eyeball except the part covered by the cornea.
White portion of the eye surrounding the iris.
The white, tough wall of the eye. Few diseases affect this layer. It is covered by the episclera (a fibrous layer between the conjunctiva and sclera ) and conjunctiva, and eye muscles are connected to this.