Double vision — when a single symptom carries very different urgencies
Double vision (diplopia) has one crucial test that decides urgency: does it go away when you cover one eye? If yes, it is binocular (a muscle or nerve problem) and often needs urgent neurological evaluation. If no, it is monocular (usually a cataract or corneal problem) and less urgent.
What can cause this — and how each feels different.
Cataract or refractive error (monocular)
Doubling remains when the other eye is covered. Usually gradual, painless, common in older adults.
Cranial nerve palsy (binocular)
Sudden onset double vision that disappears with one eye covered — needs urgent neurological review, especially if there is headache or diabetes.
Thyroid eye disease
Progressive double vision with proptosis (bulging eye), lid retraction — common cause in young to middle-aged adults.
Myasthenia gravis
Double vision that gets worse through the day, with drooping eyelids — needs neuromuscular workup.
Trauma
Any recent head or facial injury with new double vision needs same-day evaluation.
When to seek care — a practical guide.
Use the guide below only as a starting point. If you are unsure, run the free AI Symptom Checker or simply message us on WhatsApp — we would rather see you and reassure you than miss something serious.
Questions patients ask us most.
How do I test if it's monocular or binocular?
Cover one eye. If the doubling disappears, it is binocular (nerve / muscle). If it persists, it is monocular (usually a lens or corneal issue).
Can diabetes cause double vision?
Yes — diabetes can cause cranial nerve palsies (often the 6th nerve). These usually recover in 6-8 weeks but always need to be worked up.
Will prism glasses help?
Sometimes — for stable binocular diplopia after the underlying condition has been treated. We first want to know what is causing the doubling.
The AI Eye Symptom Checker is an educational triage aid only. It cannot examine your eye and it cannot make a diagnosis. It is not a substitute for a physical, in-person consultation with an ophthalmologist. If you have any doubt, please book an appointment or come to the clinic.Concept by Dr. Shantanu Kumar Gupta & Dr. Manisha Mishra · Developed with AI
This article is for patient education. It is not a substitute for personalised medical advice, examination or diagnosis. If you have symptoms discussed here, please book an in-person consultation with a qualified ophthalmologist.