Trochlear Nerve Disorder, also known as fourth cranial nerve palsy, is a condition affecting the eye muscles responsible for rotating the eye upwards. Individuals afflicted with this disorder may experience double vision, difficulty looking downwards, and a tilting of the head to compensate for the misalignment. Various synonyms exist for Trochlear Nerve Disorder, such as fourth nerve palsy, superior oblique palsy, cyclovertical palsy, and Brown Syndrome. These terms are commonly used in medical literature and discussions to describe the same condition, enabling healthcare professionals to communicate effectively. Understanding these synonyms can facilitate the diagnosis and treatment of Trochlear Nerve Disorder, ultimately improving the quality of life for individuals affected by this condition.