The<unk>  (Latin: corneal border) is the border between the cornea and the sclera (the white of the eye). It contains stem cells in its palisades of Vogt. It may be effected by cancer or by aniridia (a developmental problem), among other issues.
Corneal limbus
Corneal button
Optic cup 
Scleral lens
Optic pit
Lacrimal groove
Optic recess
Iris pigment epithelium