What clinical findings are observed in a retinal tear compared to an open‑globe (open globe) injury?

Clinical Findings in Retinal Tear vs. Open Globe Injury

Retinal tears present with photopsias (flashes), floaters, possible vitreous hemorrhage, and a visible full-thickness retinal defect on examination, while open globe injuries show obvious globe disruption with severe vision loss (often no light perception), positive Seidel test, and B-scan findings of disorganized intraocular contents, choroidal detachment, or retinal detachment.

Retinal Tear Clinical Presentation

Symptoms

• Photopsias (light flashes) - most noticeable in darkness, caused by vitreous traction on retina 1
• Floaters (myodesopias) - from blood, vitreous collagen condensations, or Weiss ring (glial tissue torn from optic nerve) 1
• Vitreous hemorrhage - present in 8-22% of acute posterior vitreous detachment (PVD) cases; two-thirds of patients with vitreous hemorrhage have at least one retinal break 1

Examination Findings

• Horseshoe-shaped tear - flap of tissue remains attached to detached vitreous gel, caused by vitreoretinal traction 1
• Operculated tear - circular/oval piece of retina pulled free, traction eliminated if occurs during PVD 1
• Round holes - frequently within lattice degeneration areas, unassociated with traction 1
• Pigmented cells in vitreous ("tobacco dust") - 80% of patients who later develop breaks had this or hemorrhage initially 1
• Weiss ring - glial annulus in vitreous cavity, strong evidence of PVD 1
• 88% of breaks occur in superior quadrants when associated with vitreous hemorrhage 1

Key Clinical Pitfall

Between 2-5% of patients with acute PVD and no initial retinal break will develop one in subsequent weeks 1. Patients with vitreous pigment, any hemorrhage, or visible vitreoretinal traction require re-examination within 6 weeks or immediately if new symptoms develop 1.

Open Globe Injury Clinical Presentation

Symptoms & Initial Findings

• Severe vision loss - median presenting visual acuity is light perception or worse 2
• 62% present as open globe injuries in trauma series 2
• No light perception (NLP) vision - common initial presentation, though 17% may recover some vision 3
• History of trauma - fist injuries (33%), work-related accidents, motor vehicle collisions 4, 5

Examination Findings

• Globe deformity - most common CT finding (30%) 2
• Positive Seidel test - aqueous leakage from wound
• Visible scleral or corneal laceration/rupture - 86% present with rupture rather than laceration 3
• Shallow or flat anterior chamber
• Uveal tissue prolapse through wound
• Hyphema - blood in anterior chamber
• Lens disruption or dislocation

Posterior Segment Findings (B-scan Ultrasound)

• Choroidal detachment - present in 20% initially; associated with worse visual outcomes (median logMAR 2.0 at final follow-up vs. 0.4 without) 2
• Retinal detachment - strongly predicts poor outcome (median logMAR 3.7 at final follow-up vs. 0.4 without) 6, 2
• Disorganized intraocular contents - only factor significantly associated with lack of visual recovery (odds ratio 0.170) 3
• Vitreous hemorrhage - common finding
• Intraocular foreign body - detected in 21% on ultrasound biomicroscopy 2

Associated Injuries

• Ciliary body injury - present in 13 of 75 cases (17%) in one series 4
• Choroidal injury - present in 62.7% of ruptured globe cases 4
• Retinal incarceration in scleral wound - critical complication leading to poor outcomes 4

Critical Distinguishing Features

Vision at Presentation

• Retinal tear: Often normal or mildly reduced unless macula involved or significant vitreous hemorrhage
• Open globe: Typically light perception or worse; NLP in severe cases 3

Globe Integrity

• Retinal tear: Globe intact, normal intraocular pressure or slightly elevated
• Open globe: Disrupted globe wall, often hypotony, positive Seidel test

Imaging

• Retinal tear: B-scan shows PVD, possible localized retinal detachment, vitreous hemorrhage
• Open globe: CT shows globe deformity (30%), B-scan shows choroidal detachment (20%), disorganized contents, or extensive retinal detachment 2

Timing & Mechanism

• Retinal tear: Typically ages 45-65, spontaneous PVD; earlier in myopia or trauma 1
• Open globe: Any age, direct trauma mechanism, predominantly males (82-85%) 4, 5

Prognostic Implications

For retinal tears: Symptomatic horseshoe tears have >50% risk of retinal detachment without treatment; treatment reduces risk to <5% 1. Early repair before macular involvement yields >95% success rate 1.

For open globe injuries: Median time to vitrectomy repair of 20 days correlates with worse outcomes; delays beyond 20 days significantly worsen final visual acuity (P=0.02) 6. Only 17% of NLP cases recover any vision, with disorganized intraocular contents predicting failure 3.

Examination Correlation

If positive conjunctival/scleral findings on exam, 66% have positive B-scan findings; if positive anterior chamber findings, 59% have positive B-scan findings 2. This emphasizes that external examination findings should heighten suspicion for posterior segment involvement requiring imaging.