The intrusion of an ocular foreign body into the globe typically necessitates surgical removal and may cause loss of vision.
Patients prevent in a highly variable manner based on the location and properties of the foreign body, as well as the presence of any associated trauma. Common symptoms include:
- decreased visual acuity
- a "foreign body" sensation
Available at the point-of-care as a screening tool, many foreign bodies may be accurately identified with ultrasound. While sonographic findings differ based on the nature of the foreign body, common features include 2:
- abnormal echogenic structure with posterior acoustic shadowing
- vitreous hemorrhage commonly present
- may demonstrate location dependent mobility
- a vitreous foreign body would be mobile, whereas a foreign body in the posterior orbital fat may not be
- other associated injuries may include:
A CT scan of the orbit is the modality of choice, as it provides superior localization of small foreign bodies, the anatomy of the surrounding structures, and any associated injuries. Unlike MRI, it may be used in the detection of a metallic foreign body 3.
- 1. O. John Ma, James Mateer, Robert F. Reardon, Scott A. Joing. Ma and Mateer's Emergency Ultrasound, Third Edition. (2013) ISBN: 9780071793155
- 2. Bob Jarman. Emergency Point-of-Care Ultrasound. (2017) ISBN: 9780470657577
- 3. Judith E. Tintinalli, David M. Cline. Tintinalli's Emergency Medicine Manual. (2019) ISBN: 9781259009440