Confusable diagnoses · PANCE / PANRE

Subconjunctival Hemorrhage vs Traumatic Hyphema

Written & clinically reviewed by Ryan Busch, PA-C · Updated August 2026 · Report an error

Subconjunctival Hemorrhage and Traumatic Hyphema are easy to mix up on the boards. Here's a side-by-side comparison — presentation, workup, imaging, and first-line treatment — drawn from our full outlines.

Subconjunctival Hemorrhage vs Traumatic Hyphema at a glance

  • Subconjunctival Hemorrhage: Painless flat bright-red blood under conjunctiva — self-limited; investigate trauma, anticoagulation, or recurrence.
  • Traumatic Hyphema: Blood in the anterior chamber after blunt trauma — risk of rebleed (days 2-5), elevated IOP, and corneal staining; head up, eye shield, sickle screen.

Try two board-style questions on Subconjunctival Hemorrhage vs Traumatic Hyphema

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Question 1EENTEasy
A 62-year-old man on warfarin notices a bright-red patch on the white of his right eye after a bout of forceful coughing this morning. He has no eye pain, no discharge, and no change in vision, and he does not wear contact lenses. On exam there is a flat, sharply demarcated, confluent area of red discoloration over the sclera; the cornea is clear, the pupil reacts normally, and visual acuity is unchanged. Which of the following is the most likely diagnosis?
  • AAnterior chamber hemorrhage
  • BSimple sectoral episcleritis
  • CInflamed nasal pinguecula
  • DSubconjunctival hemorrhage
Reveal answer & full explanation
Correct answer: D — Subconjunctival hemorrhage
  • AAnterior chamber hemorrhage
  • BSimple sectoral episcleritis
  • CInflamed nasal pinguecula
  • DSubconjunctival hemorrhage✓

Why Subconjunctival hemorrhage is correct

  • A subconjunctival hemorrhage is blood from a ruptured small conjunctival vessel pooling beneath the conjunctiva, producing a flat, sharply demarcated bright-red patch with a completely white surrounding sclera.
  • It is painless, does not affect vision, produces no discharge, and is provoked by Valsalva (coughing, straining), trauma, hypertension, or anticoagulation — all fitting this warfarin user after coughing.
  • It is self-limited and resolves over 1-2 weeks.

Why the others are wrong

  • Anterior chamber hemorrhage — this is a hyphema: blood in the anterior chamber, seen through the cornea layering over the inferior iris rather than as a patch on the white of the eye; it usually follows blunt trauma and typically causes pain, photophobia, and blurred vision.
  • Simple sectoral episcleritis — a localized wedge of redness from dilated, radially oriented episcleral vessels that blanch with topical phenylephrine, often with mild tenderness; individual vessels are visible rather than a flat, confluent pool of blood, and it is not triggered by coughing.
  • Inflamed nasal pinguecula — this is pingueculitis: a pinguecula is a raised yellowish-white nodule at the nasal or temporal limbus, and when inflamed it causes surrounding injection and foreign-body irritation rather than a flat, painless red patch.
Question 2EENTEasy
A 19-year-old man presents to the emergency department after being struck in the right eye by a paintball during a game 1 hour ago. He reports pain, blurred vision, and light sensitivity in that eye. On examination, visual acuity is reduced to 20/80 on the right. Slit-lamp examination of the upright patient shows a layer of red blood cells filling less than one-third of the anterior chamber, and intraocular pressure is 28 mm Hg. The cornea is clear, the pupil is round and reactive, and there is no visible laceration or vitreous prolapse. Which of the following is the most likely diagnosis?
  • ACommotio retinae
  • BTraumatic hyphema
  • CAnterior uveitis
  • DVitreous hemorrhage
Reveal answer & full explanation
Correct answer: B — Traumatic hyphema
  • ACommotio retinae
  • BTraumatic hyphema✓
  • CAnterior uveitis
  • DVitreous hemorrhage

Why Traumatic hyphema is correct

  • Blunt ocular trauma (here, a paintball) tears the iris root and ciliary body and ruptures the major arterial circle of the iris, producing layered red blood cells in the anterior chamber.
  • The classic picture is gross blood layering inferiorly in the upright patient (Grade I = less than 1/3 of the chamber), reduced visual acuity, and elevated intraocular pressure — exactly this vignette.
  • Management is supportive: rigid eye shield (not a pressure patch), head elevation to 30-45 degrees, topical cycloplegic and corticosteroid, avoidance of aspirin/NSAIDs, and daily ophthalmology follow-up for 5-7 days because rebleed at days 2-5 worsens outcomes. Screen for sickle cell disease/trait in at-risk patients.

Why the others are wrong

  • Commotio retinae — concussion of the outer retina from blunt trauma that blurs vision and shows gray-white retinal whitening (Berlin edema) on fundoscopy; it is a posterior-segment injury and does not place a layer of red blood cells in the anterior chamber.
  • Anterior uveitis — inflammation producing white blood cells and flare in the anterior chamber, with pain and photophobia, but it does not produce a layered level of red blood cells and is usually non-traumatic.
  • Vitreous hemorrhage — traumatic bleeding into the vitreous cavity behind the lens causes floaters, a diminished red reflex, and an obscured fundus view, but slit-lamp examination of the anterior chamber would not show layered red blood cells.
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Side-by-side comparison

FeatureSubconjunctival HemorrhageTraumatic Hyphema
At a glancePainless flat bright-red blood under conjunctiva — self-limited; investigate trauma, anticoagulation, or recurrence.Blood in the anterior chamber after blunt trauma — risk of rebleed (days 2-5), elevated IOP, and corneal staining; head up, eye shield, sickle screen.
Classic presentationPainless, flat, well-demarcated bright-red patch under the conjunctiva with normal vision and pupil.; Bright red patch noticed by patient or pointed out by family — often on awakening; PAINLESS — mild scratchy or pressure sensation at most; Normal vision; No discharge; May report preceding cough, sneeze, vomiting, lifting, straining, or…Layered blood in the anterior chamber after blunt trauma, with elevated IOP and reduced acuity.; Pain, blurred vision, and history of recent blunt or penetrating eye trauma; Photophobia; Headache, nausea, or vomiting may indicate elevated intraocular pressure; Diplopia or restricted motility suggests orbital fracture or muscle…
Workup / key labsNone needed for isolated event in a well patient; If recurrent or atypical: CBC, PT/INR, PTT, platelets, liver function; consider von Willebrand workup if suggestive bleeding history; Blood pressure measurement is essentialClinical diagnosis by slit-lamp examination demonstrating red blood cells in the anterior chamber after trauma.; Sickle cell screen (Sickledex) and hemoglobin electrophoresis if African, Caribbean, Mediterranean, Middle Eastern, or South Asian ancestry — sickling in the AC even with trait can elevate IOP dangerously and limit medication…
ImagingNo imaging required for typical isolated SCH; If trauma — examine for hyphema, ruptured globe; CT orbits if orbital fracture or intraocular foreign body suspectedSlit-lamp examination and measurement of IOP (gentle, after ruling out open globe); Dilated fundoscopy and B-scan ultrasound if media opacity prevents posterior segment view (and globe is intact) to evaluate for vitreous hemorrhage, retinal detachment, or intraocular foreign body; CT orbits without contrast if orbital fracture, retained…
First-line treatmentReassurance — SCH is benign and self-resolves over 1-2 weeks; color fades through red → yellow before disappearing; Artificial tears for any mild irritation; Cold compresses initially (24-48 h) followed by warm compresses can speed perceived resolution; Avoid aspirin/NSAIDs and vigorous activity if recent or extensive (clinical…Protect the eye with a rigid metal or plastic shield (NOT a patch with pressure); Strict bed rest or limited activity with elevation of the head of bed to 30-45 degrees to promote settling of blood inferiorly and prevent obstruction of the visual axis and trabecular meshwork; Avoid NSAIDs and aspirin (rebleed risk); use acetaminophen…

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Full outlines

Subconjunctival Hemorrhage Traumatic Hyphema All 514 diagnoses

Educational use only. This outline is a study aid for PA students and is not medical advice or a substitute for clinical judgment. FirstPassPA is an independent study tool and is not affiliated with, endorsed by, or sponsored by NCCPA or PAEA. PANCE® and PANRE® are registered trademarks of the National Commission on Certification of Physician Assistants; End of Rotation™ is a program of the Physician Assistant Education Association.