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The Forced Duction Test (FDT) is a valuable diagnostic tool used in ophthalmology to assess extraocular muscle function. Let's dive into the details: 1. Purpose and Indications The FDT helps differentiate between **muscle weakness (paresis) and restriction of eye movement. It is particularly useful when evaluating patients with ocular motility limitations. The test can identify whether the lack of eye movement is due to a Neurological disorder or a mechanical restriction 2. Procedure : The patient is typically under local anesthesia. A toothed forceps is used to grasp the conjunctiva near the insertion of the suspected muscle. An attempt is made to move the eyeball in the direction where movement is restricted. If the eye moves easily, it suggests muscle weakness (paresis). If movement is restricted, it indicates mechanical restriction. 3. Interpretation: Positive FDT: Restricted movement suggests a mechanical cause (e.g., entrapment, fibrosis, or enlargement of muscle). Negative FDT: Easy movement indicates muscle weakness (neurogenic cause). 4. Clinical Applications: Differentiating between paralytic and restrictive strabismus. Assessing patients with orbital floor fractures or other traumatic injuries. Evaluating patients with thyroid eye disease, where muscle restriction can occur. WARNING: WARNING: Teaching Surgical procedures video that some viewers may find disturbing and inappropriate. The content is intended for medical professionals, students, and ophthalmic surgeons, not the general audience. Disclaimer "The author has no financial interest in any product mentioned in this video Dr Sudhir Singh M.S(Ophthalmology) Fellow American Academy of Ophthalmology Rotary Club Host Program International Ophthalmic Heroes of India 2020 Awardee Ambassador, Eye Foundation of America Formerly Editor Journal, Rajasthan Ophthalmological Society Sr Consultant & Head (Ophthalmology) Global Hospital & Research Centre Mount Abu ,India 307501 Websites Editor in Chief www.SquintMaster.Com YouTube Channels Jaipur2020 SquintMasterIndia Twitter / resp2020 http://www.squintmaster.com/ http://sudhir.info/ Visit Us for more on strabismus software at www.SquintMaster.Com Books by Dr Sudhir Singh White Intumescent Cataract Management: My Approach ISBN: 9798201376215 https://books2read.com/u/md6yWy Posterior Polar Cataract Management: My Approach ISBN: 9798201084349 https://books2read.com/u/3n5rno Cataract And Small Pupil Management Manual Techniques ISBN: 9798201201784 https://books2read.com/u/m2ezxk