Diagnostic Approach
Particular signs and symptoms may indicate that the underlying cause is serious and requires immediate attention and, consequently, the examiner conducting the eye examination should be alerted by their presence.
Six such signs include: conjunctival injection, ciliary flush (circumcorneal injection), corneal edema or opacities, corneal staining, abnormal pupil size, and abnormal intraocular pressure.
Read more about this topic: Red Eye (medicine)
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—Ralph Waldo Emerson (1803–1882)