I saw the floating lens sign.

Area of Science:

• Ophthalmology
• Radiology
• Medical Imaging

Background:

• Lens dislocation, or luxation, involves the displacement of the eye's natural crystalline lens or an intraocular lens (IOL).
• Complete lens dislocation can result from trauma, connective tissue disorders, or advanced cataracts, often necessitating advanced imaging for diagnosis.

Purpose of the Study:

• To describe the radiologic appearance of the "floating lens sign" on computed tomography (CT) scans.
• To highlight the clinical significance of this sign in diagnosing complete lens dislocation.

Main Methods:

• Review of CT imaging findings in cases of complete lens dislocation.
• Correlation of radiologic appearance with underlying causes and clinical presentation.

Main Results:

• The floating lens sign is visualized as a biconvex, hyperdense structure (native lens) or linear, hyperdense structure (IOL) freely within the posterior vitreous cavity.
• This sign indicates complete zonular and/or capsular disruption.

Conclusions:

• The floating lens sign is a key indicator of complete lens dislocation on CT imaging.
• Timely diagnosis and ophthalmologic evaluation are essential to prevent severe complications like glaucoma and vision loss.