NBEO Ocular Disease Part 1 Practice Test

Thyroid eye disease commonly affects eyelid position and how the eye moves. A hallmark is lid lag together with changes in how the globe moves under the lid during gaze. As the eye looks in different directions, the upper eyelid can fail to track the globe smoothly and appears to lag, especially on downgaze. This reflects inflammatory and fibrotic changes around the extraocular muscles and eyelid retractors, leading to signs like lid retraction, proptosis, and restricted eye movements. So, statements describing lid lag and globe-lid movement with gaze accurately capture the characteristic signs. These signs are not just about eyelid edema, they are closely tied to eyelid position, they are not markers of glaucoma, and they are indeed related to how the eyelid and globe move together.