Diplopia: Double Vision – Causes and Treatment
Diplopia is the medical term for double vision. Affected individuals perceive a single object as two separate images, either side by side or overlapping.
Things worth knowing about "Diplopia"
Diplopia is the medical term for double vision. Affected individuals perceive a single object as two separate images, either side by side or overlapping.
What is Diplopia?
Diplopia is the medical term for double vision, a condition in which a single object is perceived as two distinct images. It can affect one eye only (monocular diplopia) or both eyes together (binocular diplopia). Binocular diplopia disappears when one eye is closed, whereas monocular diplopia persists even with one eye covered. The condition can be temporary or chronic, and its underlying causes range from minor eye problems to serious neurological emergencies.
Causes
The causes of diplopia vary depending on whether the monocular or binocular form is present.
Causes of Monocular Diplopia
- Corneal irregularities (e.g., keratoconus, scarring)
- Lens opacity (cataracts)
- Retinal disorders
- Astigmatism (irregular curvature of the cornea)
- Dry eye syndrome
Causes of Binocular Diplopia
- Extraocular muscle palsies due to damage to the III, IV, or VI cranial nerves
- Strabismus (misalignment of the eyes)
- Graves disease (thyroid disorder with eye involvement)
- Myasthenia gravis (neuromuscular disease)
- Multiple sclerosis
- Stroke or transient ischemic attack (TIA)
- Brain or orbital tumors
- Head or eye trauma
- Diabetes mellitus (diabetic neuropathy affecting eye muscles)
- Cerebral aneurysms
Symptoms
The hallmark symptom of diplopia is seeing two images of a single object. Additional symptoms may include:
- Headaches
- Dizziness and nausea
- Eye pain or pressure behind the eye
- Drooping eyelid (ptosis)
- Squinting or misaligned eyes
- Balance disturbances
- Compensatory head tilting
Sudden onset of double vision accompanied by other neurological symptoms such as speech difficulties, numbness, or limb weakness constitutes a medical emergency and requires immediate evaluation.
Diagnosis
Diagnosis of diplopia involves a thorough clinical assessment, often conducted jointly by ophthalmologists and neurologists. Common diagnostic steps include:
- Ophthalmological examination: Assessment of eye movements, pupil responses, and lens clarity
- Cover test: Used to distinguish monocular from binocular diplopia
- Imaging: Magnetic resonance imaging (MRI) or computed tomography (CT) to evaluate the brain, cranial nerves, and orbital structures
- Blood tests: To rule out systemic conditions such as diabetes, thyroid disorders, or autoimmune diseases
- Neurological examination: Assessment of cranial nerve function and other neurological indicators
Treatment
Treatment depends entirely on the underlying cause and aims to resolve or reduce double vision while addressing the root condition.
- Prism lenses: Corrective eyeglasses with prisms to optically realign the two images
- Eye patch: Temporary occlusion of one eye to eliminate double vision
- Strabismus surgery: Surgical realignment of the eye muscles
- Botulinum toxin injections: Relaxation of overactive eye muscles
- Medication: For underlying conditions such as myasthenia gravis, Graves disease, or inflammatory causes
- Neurological or neurosurgical intervention: For tumors, aneurysms, or stroke
- Refractive correction: Glasses or contact lenses for astigmatism-related diplopia
References
- Pschyrembel Clinical Dictionary. 268th edition. De Gruyter, Berlin 2024.
- Kaufman PL, Alm A (eds.): Adler's Physiology of the Eye. 11th edition. Elsevier, 2011.
- American Academy of Ophthalmology (AAO): Diplopia – Preferred Practice Pattern. Available at: www.aao.org
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