FiskeBrysons sign refers to a medical condition primarily affecting the eye. This condition, also known as lid lag, occurs when the upper eyelid does not descend at the same rate as the eye when it moves downward. This can lead to a visible white rim between the upper eyelid and the iris, which can be a symptom of an underlying thyroid disorder. Although widely recognized as FiskeBrysons sign, it is important to note that lid lag, Perry's sign, and Stellwag's sign are all synonyms commonly used to describe the same phenomenon. Identifying these synonyms can aid medical professionals in diagnosing and treating thyroid-related eye conditions effectively.