Blunt injury to the eye can lead to various intrinsic eye injuries. Globe rupture and retrobulbar hematoma are two emergent entities that the clinician may encounter, and these are the focus of this section. Typical symptoms of globe rupture include eye deformity, eye pain, and vision loss, though depending on the clinical suggestion the deformity may not be readily apparent on the exam. Similarly, a retrobulbar hematoma may present with eye pain and vision loss, but proptosis helps to clinch this diagnosis. Both are vision threatening diagnoses and require emergency ophthalmologic consultation for definitive measures.
Globe rupture occurs when there is a defect in the cornea, sclera, or both structures. Most often, globe rupture occurs after direct penetrating trauma; however, if sufficient blunt force is applied to the eye, the intraocular pressure can increase enough to rupture the sclera.
A retrobulbar hematoma is frequently associated with orbital trauma and associated orbital floor fractures. This trauma may also occur iatrogenically during sinus surgery, ocular surgery, or other eye procedures. In the setting of anticoagulation, this may occur in rare scenarios with increases in Valsalva (e.g., from vomiting, straining, or coughing).
The incidence of globe injuries is quoted as 3.5 eye injuries per 100,000 persons, with males constituting about 80% of open globe injuries. Injuries in the pediatric population are more often with sharp objects directly penetrating the globe (e.g., writing utensils, scissors, or knives). In the adult population, the cause is often blunt trauma (e.g., motor vehicle collisions, altercations, or work-related injuries involving hammering). In the elderly, globe rupture is most often as a result of falling.
The incidence of retrobulbar hematoma is rare; it has been quoted as less than 1%. However, there is a strong association between this diagnosis and subsequent blindness.
Globe rupture occurs when there is a defect in the cornea, sclera, or both structures. Most often globe rupture occurs after direct penetrating trauma; however, if sufficient blunt force is applied to the eye, the intraocular pressure can increase enough to rupture the sclera. The rupture site is most commonly near the globe’s equator posterior to the insertion of the rectus muscles, which is where the sclera is weakest and thinnest.
A retrobulbar hematoma occurs when there is an accumulation of blood in the retrobulbar space. As blood collects behind the eye, there is increased intraocular pressure, which can subsequently cause stretching of the optic nerve. Within a matter of several hours, decreased ocular perfusion can lead to permanent blindness.
History and Physical
A high suspicion for globe injury should be suspected in any patient reporting any direct eye trauma, continuing eye pain, and vision deficit. The mechanism of the injury should be elicited as well as the time it occurred. It is important also to inquire about any anticoagulant use.
In globe rupture, physical examination findings may reveal decreased vision or frank vision loss, the irregular contour of the globe, teardrop pupil, hyphema, or a shallow anterior chamber on the slit-lamp exam. The Seidel sign is positive in globe rupture, indicating the flow of aqueous humor from the injury site in the fluorescein-stained eye. However, if the globe rupture is obvious, testing for the Seidel sign should be avoided.
The clinical presentation of retrobulbar hematoma is classical with proptosis and severe eye pain. As in globe rupture, vision loss may be reported.
There may be associated periorbital swelling, ecchymosis, or subconjunctival hemorrhage in either of these entities depending on the mechanism of the injury.
Visual acuity should be checked in each of the eyes separately, if possible, taking care not to manipulate any possible intrinsic globe injury. Pupillary defects should also be noted.
A thorough evaluation of any concomitant intracranial and facial bony injury should be pursued. A high number of globe ruptures and retrobulbar hematomas are associated with fractures, in particular of the orbital floor. Extra-ocular motility testing may be decreased in the affected eye because of entrapment, intrinsic globe deformity, or retrobulbar hematoma.
Laboratory evaluation should be pursued as the clinical situation dictates in the setting of trauma or anticoagulant use. Computed tomography (CT) imaging can rule out any additional maxillofacial injuries while confirming the diagnosis. In addition to globe deformity and retrobulbar hematoma, CT imaging can evaluate for foreign bodies, scleral disruption, and even vitreous hemorrhage.
The differential diagnosis of blunt trauma to the eye includes globe rupture, retrobulbar hematoma, traumatic glaucoma, hyphema, orbital blowout fracture with entrapment, foreign body, scleral disruption, and vitreous hemorrhage.
In patients receiving prompt treatment and evaluation, outcomes with retrobulbar hematoma and globe rupture can be satisfactory with preservation of vision. However, the extent of the initial injury and mechanism of injury often predicts whether poor outcomes might be expected.
Pearls and Other Issues
- Avoid any unnecessary manipulation of the globe (including tonometry) to prevent any extrusion of intraocular contents.
- Obtain appropriate imaging to rule out concomitant bony injury or intracranial trauma.
- Provide analgesia and antiemetics to prevent Valsalva maneuvers that may worsen globe rupture or retrobulbar hematoma.
- A protective rigid eye shield should be utilized to prevent any additional injury; eye patches are contraindicated.
- Provide prophylactic antibiotics to help prevent endophthalmitis.
- Seek emergent Ophthalmology consultation for definitive measures, but do not delay lateral canthotomy for patients with known retrobulbar hematoma.
Enhancing Healthcare Team Outcomes
Eye trauma is very common resulting in loss of vision in many people. Without vision, one becomes handicapped and getting a suitable job is difficult. In many cases, ocular eye injury is preventable and the onus is on all clinicians to educate patients on eye safety. An interprofessional team is probably the best way to educate and monitor patients with eye trauma. Because of a serious shortage of eye surgeons, most patients are followed up by the primary care provider or nurse practitioner as outpatients.
Eye trauma commonly presents to the emergency department. However, in the ED asides from a superficial exam including a visual acuity test, analysis of deeper injury to the eye is not always possible. Hence, healthcare workers including nurse practitioners should always consult with the ophthalmologist on call to assess the eye.
The emergency department physician may treat superficial laceration around the eye but all patients with vision loss should be referred to the ophthalmologist. During follow up the nurse practitioner and primary care provider should communicate with the eye surgeon if there are any vision related problems.
Missing eye injuries can lead to permanent visual loss and may include prolonged litigation.
Finally all clinicians should educate patients on eye safety such as wearing face helmets and safety goggles when working with splashing liquids or flying debris.