Blurry vision in one or both eyes in the morning is something that happens to many people. In most cases, it is not a concern and the vision clears after a few blinks or rubbing the eyes.
Why you might have blurry vision in the morning
Dry eyes (lack of tears)
Tears keep the eye moist and protected. During the night, tears can dry on the surface of the eye and cause foggy or blurred vision in the morning. This usually goes away quickly after a few blinks.
Eye allergies
Allergies can cause itchy, red, watery, and dry eyes, leading to blurry vision in the morning. They are often related to dust, spiders, or animal dander in the room, or to detergents on the sheets.
Sleeping face down
Sleeping face down can cause a condition where the upper eyelid loses elasticity, leading to blurred vision in the morning, tearing, and burning eyes. It occurs most often in overweight people, but it can happen to anyone.
Fuchs' corneal dystrophy
It is an inherited condition that causes the cornea to swell during sleep, causing blurred vision in the morning. It usually improves during the day. It is most common in women over the age of 50.
Taking certain medications before bedtime
Antihistamines, sleeping pills, cold medicines, and some blood pressure medications can reduce tear production, causing dry eyes and blurry vision in the morning.
Sleeping with contact lenses
Sleeping with lenses reduces the oxygen supply to the eyes and can cause dryness and blurred vision. Lenses should always be removed before sleeping.
Alcohol consumption before bedtime
Alcohol causes dehydration, which can lead to dry eyes and blurred vision in the morning.
Blood sugar problems
Too high or too low blood sugar can cause blurred vision in the morning. It is often accompanied by other symptoms such as fatigue, dizziness, and weakness. In some cases, it can be a sign of diabetes.
Problems with the oil glands of the eye
The small glands around the eye can produce excess oil at night, causing irritation and blurred vision in the morning.
Sleeping with a fan facing your face
Constant air can dry out the eyes and skin even during sleep, causing itching, irritation, and blurred vision.
When should you see a doctor?
There is no need to worry if the blurriness disappears quickly after waking up or occurs occasionally.
You should see a doctor if:
the blurriness continues throughout the day
happens often for no apparent reason
accompanied by other symptoms
In rare cases, blurred vision can be related to serious problems such as stroke, so if symptoms such as difficulty speaking, weakness on one side of the body, dizziness, or severe headache occur, emergency medical attention should be sought.
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