Differential Diagnosis for Eye Pain

Immediate Vision-Threatening Emergencies

The American College of Radiology recommends immediate imaging and treatment for orbital cellulitis, characterized by periorbital soft tissue swelling, pain, and restricted eye movement 1
The American Academy of Ophthalmology suggests that bilateral transient episodes with halos around lights, opaque vision, and eye pain are pathognomonic for intermittent angle closure, with a 50% risk of acute crisis within 5 years if left untreated 2
Untreated fellow eyes have an 18% risk of becoming blind, emphasizing the need for urgent ophthalmology referral and gonioscopy to confirm iridotrabecular contact 2
Mid-dilated, poorly reactive, or oval pupil on examination requires urgent ophthalmology referral, as it may indicate acute angle-closure glaucoma 3
Infectious keratitis presents with severe pain, photophobia, and blurred vision, demanding immediate ophthalmologic consultation before any treatment initiation 3

The American Academy of Ophthalmology recommends managing dry eye syndrome with ocular lubricants and anti-inflammatory treatment, as burning and stinging pain can be disproportionate to clinical signs 4
Neuropathic corneal pain is commonly misdiagnosed, with symptoms outweighing clinical signs, and requires topical nerve regenerative therapies or oral neuromodulators for treatment 4
Combination therapy addressing multiple factors is essential for neuropathic corneal pain, as stated by the Ophthalmology society 5, 6

Visual acuity testing is essential as a baseline for every patient with eye pain, according to the American Academy of Ophthalmology 3
Pupil examination for reactivity and afferent defects, as well as slit-lamp biomicroscopy of the anterior segment, are crucial for diagnosis 3
Intraocular pressure measurement is necessary, especially if angle closure is suspected, as recommended by the American Academy of Ophthalmology 3, 2
Fluorescein staining for corneal integrity is a vital diagnostic tool, as stated by the American Academy of Ophthalmology 4, 3

Immediate ophthalmology referral is necessary if vision changes, severe photophobia, or mid-dilated or poorly reactive pupil are present, as emphasized by the American Academy of Ophthalmology 3, 2
Elevated intraocular pressure requires immediate attention, and gonioscopy is necessary if angle closure is suspected, according to the American Academy of Ophthalmology 2

Never dismiss transient symptoms as benign, as they may represent warning episodes before potentially blinding acute attacks, warns the American Academy of Ophthalmology 2
Do not delay fellow eye prophylaxis after treating one eye for angle closure, as the risk of acute crisis is high, according to the American Academy of Ophthalmology 2
Avoid fluorescein-anesthetic combination drops for tear break-up time assessment, as recommended by the American Academy of Ophthalmology 4
Do not initiate treatment before establishing a diagnosis in patients with blurred vision, pain, and photophobia, emphasizes the American Academy of Ophthalmology 3

The American Academy of Ophthalmology recommends urgent ophthalmology referral for patients with elevated intraocular pressure (IOP), with an 18% risk of blindness and 48% developing glaucomatous optic neuropathy within 4-10 years if untreated 7

The American Uveitis Society suggests that bilateral, insidious onset uveitis may indicate systemic inflammatory disease association, requiring ophthalmology referral for slit-lamp confirmation and treatment with topical and potentially systemic steroids 8, 9
The American Academy of Ophthalmology notes that episcleritis usually responds to topical steroids or NSAIDs without systemic treatment 8, 9

The International Association for the Study of Pain recommends the proparacaine challenge test to differentiate peripheral from central neuropathic pain, with complete relief suggesting peripheral origin, no relief indicating central sensitization, and partial relief suggesting mixed pathology 10
The American Academy of Ophthalmology suggests that in vivo confocal microscopy can confirm corneal nerve damage showing decreased nerve density, increased tortuosity, and beading 10

The American Academy of Ophthalmology notes that dry eye syndrome presents with burning, stinging, foreign body sensation, photophobia, and symptoms worsening later in the day, exacerbated by wind, air travel, low humidity, and prolonged visual tasks 11