the.com/sclera
The eye's stubborn white wall, quietly holding the whole wet machine together.
means The tough, opaque outer layer of the eyeball — the white part you see around the iris.
from From Greek skleros, hard — the same root powering sclerosis, naming the eye's literally tough coat.
Human exclusiveVisible whites are nearly unique among primates.
Gaze cueBig sclera lets us track each other's stares.
Same tissueIt merges seamlessly with the clear cornea up front.