Which condition is characterized by the eyes moving in repetitive and uncontrolled movements?

Nystagmus is the condition characterized by the eyes moving in repetitive and uncontrolled movements. This can manifest as rapid oscillations of the eyes, which may occur in both horizontal and vertical directions. The movements can be caused by a variety of factors, including neurological issues, inner ear problems, or certain medications. In nystagmus, the key feature is the motion of the eyes, which is involuntary and often affects vision and balance.

Strabismus, on the other hand, involves the misalignment of the eyes, where one eye may look straight ahead while the other turns in, out, up, or down. It does not involve the uncontrolled movements seen in nystagmus.

Blepharitis refers to inflammation of the eyelid margins, typically presenting with crusting, redness, or irritation, and does not involve eye movement. Conjunctivitis, or inflammation of the conjunctiva, usually involves redness and discharge from the eye, but again, it does not involve the uncontrolled movements characteristic of nystagmus.

Thus, nystagmus stands out clearly due to its defining repetitive and uncontrolled eye movements.