English translation: pericorneal conjunctival hyper(a)emia/injection
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I've translated this in the past as perikeratic conjunctival hypreraemia. "pericorneal is a synonym of "perikeratic". As "pericorneale" also exists in Italian I would stick with "perikeratic" here or turn it completely around with "conjunctival hyperaemia surrounding the cornea" (it basically means conjunctival swelling of the area around the cornea).
perikeratic (peri·ker·at·ic) (per”ĭ-kə-rat´ik) surrounding the cornea.