Watering eyes are a common problem, particularly in older people. A blocked tear duct is the most common cause, but there are a number of other causes. You may not need treatment if symptoms are mild. An operation can usually cure a blocked tear duct. Other treatments depend on the cause.
Who gets watering eyes?
Watering eyes (tears rolling on to your cheeks) can occur at any age, but are most common in young babies and in people over the age of 60. It can occur in one or both eyes.
Understanding normal tears
Just above, and to the outer side, of each eye is a small gland called the lacrimal gland. This constantly makes a small amount of tears. When you blink, the eyelid spreads the tears over the front of the eye to keep it moist.
The tears then drain down small channels (canaliculi) on the inner side of the eye into a tear sac. From here they flow down a channel called the tear duct (also called the nasolacrimal duct) into the nose.
What are the possible causes of watering eyes?
Making too many tears
- Emotion can make you cry.
- Anything that irritates the eye can cause you to make a lot of tears. The watering is a protective reflex to help clear irritants away from the eye. For example:
- Chemical irritants such as onions, fumes, etc.
- Infection of the front of the eye (infective conjunctivitis).
- An allergy causing inflammation of the front of the eye (allergic conjunctivitis).
- A small injury or scratch to the front of the eye, or a piece of dirt or grit which gets stuck in the eye.
- Eyelashes that grow inwards can irritate the front of the eye. This is called an entropion. (See separate leaflet called 'Entropion'.)
- Abnormalities of the tear film. For example, the lipid (fat) content of tears may not be right. The tear film may then not spread evenly across the front of the eye. Patches of dryness may then develop which can become sore and make your eyes water.
- Thyroid eye disease is an uncommon cause.
Faulty drainage of tears
- Tears may become blocked at any point in the drainage channels.
- The most common cause of watering eye in adults is a blockage in the tear duct just below the tear sac. This is thought to be due to a gradual narrowing of the upper end of the tear duct, perhaps caused by persistent mild inflammation. If you have a blocked tear duct, not only will you have watering eyes, but the stagnant tears within the tear sac may become infected. If the tear sac gets infected you will also have a sticky discharge on the eye. You may also develop a painful swelling on the side of the nose next to the eye.
- Sometimes the tear duct is not blocked fully, but is too narrow to drain all the tears.
- Less commonly, there may be a blockage within the canaliculi, or the entrance to the canaliculi in the inner corner of the eye may be blocked. This may be due to inflammation or scarring.
- Rarely, a polyp in the nose may block the tears from coming out of the tear duct.
- Some babies are born with a tear duct which has not fully opened. This is common and usually clears within a few weeks without any treatment as the tear duct opens fully.
- Ectropion. This is where the lower eyelid turns outward away from the eye. The ectropion may cause tears to roll off the bottom of the eyelid rather than drain down the canaliculi to the tear sac. See a separate leaflet called 'Ectropion'.
Do I need any tests?
Sometimes the cause is easily identified. For example: infections, ectropion, entropion, conjunctivitis. If there is no obvious cause revealed by a simple examination, further tests may be advised. These may depend on how bad the watering is, and how much it bothers you.
If a drainage problem is suspected, an eye specialist may examine the tear drainage channels, under local anaesthetic. They may push a thin probe (stick) into the canaliculi towards the tear sac to see if it is blocked. If the probe goes as far as the tear sac then fluid can be syringed into the tear duct to see if it comes out in the nose. Syringing may sometimes clear a blockage, but it may only give temporary relief. If there seems to be a blockage then a dye may be injected into the tear duct. An X-ray picture is then taken. You can see the dye in the duct on the X-ray film. It will show exactly where there is any obstruction or narrowing of the tear duct.
What is the treatment for watering eyes?
Treating eye irritation
Quite often the cause can be treated. For example:
- Eyelashes irritating the front of the eye (entropion) can be removed.
- Conjunctivitis can usually be treated with drops.
- Pieces of grit, etc, can be removed.
Treating tear drainage problems
- Ectropion can usually be treated with a minor operation to the lower eyelid.
- Babies with watery eyes usually grow out of it with no treatment. (See separate leaflet called 'Tear Duct Blockage in Babies'.)
- Blockage of the channels in adults.
- You may not need treatment if the watering is mild or does not bother you much.
- A blocked tear duct can be treated with an operation. The usual operation is called dacrocystorhinostomy (DCR) where a new channel is made from the tear sac to the inside of the nose. Tears then bypass any blockage further down the tear duct. Another less commonly used operation is to blow up a tiny balloon inside the tear duct to make it wider, or insert a device that holds the walls of the duct open (a stent).
- A narrowed canaliculi which is not fully blocked may be widened by pushing in a probe. However, if it is completely blocked, an operation is an option to drain the tears into the nose.
Further reading & references
- Nasolacrimal duct obstruction, College of Optometrists (January 2009)
- Gilliland GD, Dacryocystitis, Medscape, Aug 2009
- Beigi B; Epiphora, 2011
- Camara JG et al; Obstruction Nasolacrimal Duct, Medscape, Jan 2010
Disclaimer: This article is for information only and should not be used for the diagnosis or treatment of medical conditions. EMIS has used all reasonable care in compiling the information but make no warranty as to its accuracy. Consult a doctor or other health care professional for diagnosis and treatment of medical conditions. For details see our conditions.
Dr Tim Kenny
Dr Laurence Knott
Dr Tim Kenny