In a study with US National Library of Medicine National Institutes of Health, conjunctival congestion was looked at in greater detail.
The study noted: “Conjunctival injection was found to mostly involve vessels of the palpebral territory stemming from both superior and inferior palpebral vessels that supply the tarsal conjunctiva and most of the ocular conjunctiva.
“Episcleral injection was also observed. During attacks, the appearance of the conjunctiva suggested conjunctival edema or chemosis.
“Furthermore, the presence of edema below the capsule of Tenon was strongly suspected.
Source: | Daily Express