In medicine,<unk> is a non-specific term to describe an eye that appears<unk>  due to illness, injury, or some other condition. "Conjunctival injection" and "bloodshot eyes" are two forms of<unk> 
Since it is a common affliction, it is unsurprising that primary care doctors often deal with patients with<unk>  in their practices.
The goal of the primary care doctor when presented with a<unk> is to assess whether it is an emergency in need of referral and immediate action, or instead a benign condition that can be managed easily and effectively.<unk> usually refers to hyperemia of the superficial blood vessels of the conjunctiva, sclera or episclera, and may be caused by diseases or disorders of these structures or adjacent structures that may affect them directly or indirectly.
Red eye 
Mind's eye
Black eye
Blue sclera
Exophthalmos
Buphthalmos
Dry eyes
Lagophthalmos