Brown syndrome is a movement disorder of the eye in which the gaze upward and toward the nose is restricted. The cause lies in a dysfunction of the tendon of the superior oblique muscle (musculus obliquus superior), which cannot move freely. The condition is usually congenital but can also be acquired during life.
The affected eye appears outwardly normal but shows a marked restriction when looking upward and inward (toward the nose). While the healthy eye looks upward normally, the affected eye lags in this gaze direction or cannot lift at all. This results in a visible misalignment that is especially noticeable when looking upward.
Typical signs include:
In most cases, Brown syndrome is congenital and the exact cause is unknown. The tendon of the superior oblique muscle slides through a connective tissue loop (trochlea) at the upper inner corner of the eye socket. In Brown syndrome, this sliding mechanism is disturbed — the tendon binds.
Acquired forms can occur after:
In about 90% of cases, only one eye is affected, more often the right. Bilateral cases are rare.
Familial inheritance is the exception. The vast majority of cases occur sporadically.
In mild cases, there is little impairment of vision. However, severe forms can disturb binocular vision and thereby limit depth perception. If the affected eye remains in a misaligned position permanently, there is also a risk of amblyopia (lazy eye), especially in children.
Yes, in some cases the movement restriction resolves spontaneously, both in congenital and acquired forms. In congenital cases, however, the restriction more often persists.
Therapy depends on the cause and severity.
Mild cases are initially observed closely. Visual acuity, eye alignment, and binocular vision are regularly monitored, especially in young children.
Inflammatory forms can be treated with steroid injections near the trochlea, oral steroids, anti-inflammatory medications, or immunosuppressants.
A surgical procedure is considered when:
The goal of surgery is to release the restricted tendon or restore the sliding mechanism. In some cases, multiple procedures are required, and occasionally the healthy eye is also operated on to achieve a symmetrical result.
Because children often look upward (at adults, blackboards, etc.), Brown syndrome is often more noticeable in them than in adults. If you notice an unusual head posture or uneven eye movement in your child, we recommend an ophthalmological examination.