If you have double vision, your treatment will depend on whether you have double vision in one eye (monocular) or both eyes (binocular) and the underlying cause.
Underlying conditions may be treated separately. Read more about the causes of double vision.
Double vision in one eye
If you are diagnosed with monocular double vision, treatment will depend on the underlying condition causing the problem.
If you have monocular double vision caused by astigmatism (an abnormally curved cornea), you may be prescribed corrective lenses, such as glasses or contact lenses. Most children over 12 years of age are able to wear contact lenses.
Corrective lenses compensate for the uneven curve of the cornea so the incoming light that passes through the corrective lens is properly focused on the retina.
Laser surgery is another possible option for treating astigmatism, but it is not usually available free of charge on the NHS.
Read more about treating astigmatism.
If you have monocular double vision caused by cataracts (clouding of the lens), you may need cataract surgery to remove them. If you have cataracts in both eyes, you will have them removed on separate occasions to give the first eye time to heal and to allow your vision to return.
Cataract operations are common procedures, usually performed as day surgery, which means you should be able to go home shortly afterwards.
Read more about cataract surgery, including how it is carried out and your recovery.
Double vision in both eyes
Treatment for binocular double vision also depends on the underlying cause. Read more about the causes of double vision.
Possible treatment options include:
- wearing glasses
- doing special eye exercises
- fixing prisms on your glasses
- wearing an eyepatch over one eye
- wearing an opaque (not see through) contact lens in one eye
- having botulinum toxin injections into an eye muscle
- having surgery on your eye muscles
Sometimes, children are able to ignore double vision because their brain deals with the problem by ignoring, or ‘suppressing’, one of the two images.
Most squints in children (when the eyes are pointing at different angles) are successfully treated, if condition is detected and treated early. Read more about treating squints.
A prism is a wedge-shaped piece of glass or plastic that bends the light that shines though it. Special prisms called Fresnel (pronounced frennel) prisms can be attached to your glasses and are an effective way of treating double vision.
Fresnel prisms are thin, see-through sheets of plastic. One side sticks to the lens of your glasses and the other side has special grooves in it that change the way the light enters your eye.
You may need to wear prisms for several months. The strength can be adjusted to suit your eyes. If the Fresnel prisms are successful, you can have glasses made with prisms built in.
Botulinum toxin injections are sometimes used to treat eye movement disorders, such as squints. Botulinum toxin is a poison, but in very small doses it is used to treat a range of different health conditions.
The botulinum toxin is injected into one of the muscles that controls the movement of your eye. It blocks the chemical messages sent from the nerves and causes the muscle to relax. This means the muscle can no longer move your eye and the other muscles take over and straighten the eye.
After the injection, you may experience some temporary side effects such as:
- a droopy eyelid (ptosis)
- overcorrecting the position of your eye so that your eyes are not aligned properly, which can mean your eye "drifts" slightly and appears as if one eye is looking up or in the opposite direction
- worse double vision
Surgery on your eye muscles
If your double vision is caused by a squint, surgery on your eye muscles can correct the position of your eyes. Any decision to have surgery is made on the basis that the benefit offered by the surgery (usually to align your eyes) is bigger than any risks of the surgery.
There are six muscles controlling the position of each eye. Each muscle can be weakened, strengthened or moved. Depending on your particular squint, surgery can be carried out on the eye muscles to change the position of your eyes and realign them.
The risks of squint surgery include:
- making any double vision worse
- damaging the eye or your vision
- having a poor result from the operation that could mean you need further squint surgery
Your eyecare team will discuss the risks and benefits with you.
Opaque intraocular lens
For some cases of double vision, a surgical procedure known as opaque intraocular lens (IOL) may be an option. However, this procedure is only recommended when other treatment methods have been unsuccessful.
An opaque intraocular lens can only be used to treat people with binocular double vision (both eyes). The procedure usually involves removing the lens of the eye, either under local anaesthetic or general anaesthetic, and replacing it with an implant.
Although it is considered to be a safe procedure, there are risks associated with having an opaque intraocular lens fitted. These include:
- the intraocular lens breaking after it has been inserted
- damage to the natural lens of the eye (if it is not removed)
- inability to examine the back part of the eye (retina)
- reduced visual field
Therefore, before having an opaque intraocular lens implant, you should discuss the implications of the procedure with your ophthalmologist (eye specialist). The opaque intraocular lens procedure is irreversible and removing the implant would involve significant risk of damaging your eye and impairing your vision.