Many patients presenting to the primary care facility with an ocular emergency are looking for reassurance and/or some information about the prognosis of their injury. Without proper knowledge in the field, the general practitioner handling the case might end up providing inaccurate care to the patient that will not have any significant effect on their condition.
Before we discuss some of the common ocular emergencies that can be encountered at the primary care setting, we need to establish a few important rules related to the care of acutely injured patients. A complete history is essential as it can give clues about the mechanism of injury, any legal actions needed, and the extent and nature of ocular trauma. The patient should be observed and examined with a bright light and a pen torch. At the primary care level, one should be able to identify foreign bodies, chemosis, corneal haze, and the presence of blood or pus in the anterior chamber of the eye. The presence and extent of corneal injuries should be also noted. The pupils should also be examined for any pupillary defects or a dilated pupil.
Visual acuity should be assessed as soon as possible as it is the most important test in terms of prognosis and long-term outcomes. If there are any changes in visual acuity, the primary health care physician must refer the patient to the nearest emergency department for an ophthalmologist consultation immediately.
Traumatic Ocular Injuries
Traumatic injuries to the eyes can be penetrating or non-penetrating. The clinical characteristics and features of these two types of ocular injuries are a little bit different. Additionally, the clinical outcome and necessity for urgent referral to a hospital are somewhat dependent on the type of injury. The severity of the traumatic injury, however, is the most crucial factor in determining the course of action a primary care physician should follow when he or she encounters a patient with an ocular injury.
Penetrating Ocular Injuries
Fortunately, penetrating ocular injuries are rare. The presentation of a penetrating wound to the eye globe is usually dramatic. The pupil is usually irregular and non-reactive to light. Bubbles might be seen in the anterior chamber. Hyphaema is another common finding in penetrating ocular injuries.
When a patient presents with a penetrating ocular injury, the eye should neither be touched nor manipulated. Instead, it should be shielded and the patient should be referred to an emergency department at a nearby hospital for optimum ophthalmologic management. Before shielding the eye, one can apply a topical anesthetic and a topical antibiotic. The patient should also receive a tetanus booster dose if needed.
Non-penetrating Ocular Injuries
Blunt trauma to the eye is more common compared to penetrating injuries. Blunt trauma might be caused by a direct hit with a ball or a fist, or an accidental fall. Lid edema is common, which can make an examination of the eye globe difficult. The pupil is usually dilated. Fractures of the orbit are common with blunt trauma to the face and eye; therefore, the patient should be referred to a hospital at some point to get a computerized tomography scan of the orbital bones to rule out orbital fractures. The urgency of the referral of the patient is dependent on the severity of the injury. Hyphaema is also seen with non-penetrating ocular injuries.
Severity of Ocular Trauma
As it has been mentioned already, the severity of ocular trauma is the most crucial factor in deciding when and how to refer the patient to a hospital. The severity of ocular trauma from a primary care point of view can be classified as mild, moderate or severe.
Mild ocular trauma is characterized by a visual acuity that is better than 6/12, the absence of hyphaema, and a normal reactive pupil. A patient with a mild ocular trauma should undergo a dilated fundus examination and then referred to a tertiary health care center within 48 hours.
Moderate ocular trauma is characterized by a visual acuity between 6/12 and 6/24. Micro-hyphaema is present and the pupil is usually dilated. Such patients should undergo a dilated fundus examination, followed by shielding of the eye. The patient should be referred to a tertiary health care center within 24 hours.
Patients with severe ocular trauma, defined as a visual acuity worse than 6/24, macro-hyphaema, and the presence of a pupil defect, should get their affected eye shielded. Immediate referral to a hospital emergency department should be attempted.
Chemical Ocular Injuries
Exposure of the eyes to corrosive chemicals is another common mechanism of ocular injury. The immediate irrigation of the eye with copious amounts of water is essential as it prevents further damage of the eye.
Patients with chemical ocular injuries are often in severe pain; therefore, topical anesthetic drops should be administered. This can be performed before starting the irrigation as it makes the irrigation procedure less painful to the patient.
Sometimes, chemicals and foreign materials tend to stick under the lids; therefore, a careful examination of the eyelids should be attempted and any chemicals or materials should be removed. The next step in the management of these patients is to perform a baseline visual acuity test. Finally, all patients with chemical ocular injuries should be referred to the hospital emergency department as soon as possible.
Acute Angle Closure Glaucoma
Patients with acute angle-closure glaucoma present with severe nausea, vomiting, eye-globe pain, headache and blurred vision. Acute angle closure glaucoma is more common in women, those older than 50 years, and those who have a family history of the disease.
The pupil is mid-dilated and the cornea is usually edematous. The patient typically has a rapid decrease in their visual acuity. Intra-ocular pressure testing is used to confirm the diagnosis. Once the diagnosis is confirmed, the patient should be referred for a tertiary health care center to an ophthalmologist.
This is a life-threatening condition that can affect both eyes. Fortunately, the condition is rare. It usually affects young adults. Fever and malaise are common. The affected eye will be proptosed and ocular movements will be painful. Visual acuity might be affected.
Many patients report a recent history of a paranasal sinus infection. It has been suggested that orbital cellulitis might happen as a consequence to direct extension of a paranasal infection “sinusitis” into the orbit. Preseptal cellulitis is a different condition that is characterized by the presence of eyelid swelling; however, eye movements are not restricted. Additionally, visual acuity is usually not affected in preseptal cellulitis.
Patients with orbital cellulitis should be referred to a hospital for inpatient treatment and hospitalization. Untreated orbital cellulitis can lead to brain abscess, cavernous sinus thrombosis and meningitis.