Q. What is strabismus (Suint)?
Strabismus is a condition in which the eyes point in different directions. Other terms used to describe strabismus are "squint", "wandering eye", "cross eyed", or a "lazy eye".
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When an eye is turned inwards this is known as a convergent squint or an esotropia.
When an eye is turned outwards this is known as a divergent squint or an exotropia.
When an eye is deviated upwards this is known as a vertical squint or hypertropia.
Approximately 4% of adults have misaligned eyes. Strabismus in adults can develop for many reasons;
Adults who previous had well aligned eyes and who suddenly develop strabismus, will almost certainly suffer from double vision. The double vision may only be present when they look in a particular direction or it may occur irrespective of where they are looking. This double vision can be very trouble-some as it may interfere with everyday tasks and could disqualify the them from driving. In patients who are struggling to overcome strabismus and keep their eyes together, symptoms such as headaches, "eye strain" and intermittent double vision are common. These patients may have to tilt or turn their head in a certain direction to help control their strabismus. This compensatory head posture may cause neck and muscular problems.
Strabismus may be a sign of an underlying medical condition and any adult who suddenly develops strabismus should be seen by an Ophthalmologist who will be able to determine the cause of their strabismus.c
In addition to affecting eye function, misaligned eyes can get in the way of normal eye-to-eye contact, communication skills and social interaction. This can lead to reduced self-confidence and many patients will often look down or away from the person to whom they are speaking to avoid eye contact. The person being spoken to may be uncertain which eye the patient is using and may be distracted from what the patient is trying to communicate. Such impairment of communication skills can lead to limited job (or job advancement) opportunities.
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Strabismus may be noted by the patient themselves (especially if it is causing double vision) or by family and friends. Strabismus is often detected by an Optometrist during a routine eye examination or by a patient's General Practitioner. All patients with strabismus should be referred to an Ophthalmologist who will carry out a comprehensive eye examination in order to determine the exact nature of the strabismus and what the treatment options are.
Strabismus can be treated in various ways. Depending on the individual case, treatment options include : -
Strabismus surgery is not a "cosmetic" procedure but should more appropriately be considered as reconstructive surgery. Cosmetic surgery (such as in face lifts, etc.) alters a normal appearance, whereas reconstructive surgery changes an abnormal appearance to one that is more normal.
Surgery is usually carried out as a day-case procedure under a general anaesthetic. Although it is possible to undergo surgery awake with a local anaesthetic, if a patient is not able to have a general anaesthetic. The eye is not "taken out" during surgery, the muscles of the eye are like thin elastic bands and are found 5-6mm from the edge of the coloured part of the eye and lie just underneath the conjunctiva.
To straighten the eyes your surgeon will use a combination of muscle strengthening and weakening procedures. In the case of a convergent squint the outer muscle of the in-turned eye is strengthened by removing a section of muscle (muscle resection), and the inner muscle is weakened by detaching it from the eye and moving it further backwards (muscle recession).
Most adult strabismus surgery is carried out using an adjustable stitch technique, whereby the muscles are tied back onto the eye with a bow knot (like your shoelaces). This technique allows the surgeon to fine tune the position of the eyes after the operation with the patient awake, if the eyes are not already in the perfect position. Using anaesthetic drops to numb the eye the bow knot can be undone and the position of the muscle altered until the correct eye position is achieved.
The eye will be red and slightly uncomfortable for 2-3 weeks after the surgery, but most people are able to return to normal everyday activities within 2-3 days of their surgery. Swimming should be avoided for 2-3 weeks after surgery. A combination of anti-inflammatory and antibiotic drops are administered to the eye for 1-2 weeks after the surgery to help prevent infection and to reduce inflammation.
Patients who have had a squint since childhood or have very poor vision in one eye usually have no 3-dimensional vision. This means they lack the ability to use their eyes together, even when the eyes have been straightened by strabismus surgery. In such patients there is a possibility that their eyes will drift inwards or outwards once again. It is not uncommon to have some temporary double vision for a short period after the surgery as the eyes adjust to their new position. The risk of developing troublesome double vision after surgery is reduced by the use of an adjustable stitch technique. It is important to remember that in the hands of an experienced strabismus surgeon surgery, the vast majority of operations are performed with no complications.