Normal in vivo eye dimensions by computed tomography

Area of Science:

• Ophthalmology
• Medical Imaging
• Anatomy

Background:

• Accurate in vivo eye dimensions are crucial for medical procedures, particularly for intraorbital foreign body localization.
• Existing localization methods, such as those by Sweet and Pfeiffer-Comberg, rely on assumptions about eye size.

Purpose of the Study:

• To establish normative in vivo ocular dimensions in a healthy adult population.
• To evaluate the accuracy of commonly used methods for intraorbital foreign body localization against actual in vivo measurements.

Main Methods:

• Computed tomography (CT) scans were performed on 55 healthy adult subjects.
• In vivo measurements of the maximum transverse and maximum anteroposterior dimensions of the eye were obtained.
• Statistical analysis was used to determine means and standard deviations for these dimensions.

Main Results:

• Normative data for in vivo ocular dimensions (maximum transverse and anteroposterior) were established.
• The study found that the widely used Sweet and Pfeiffer-Comberg methods significantly underestimate the actual in vivo dimensions of the human eye.

Conclusions:

• The established in vivo ocular dimensions provide a more accurate reference for clinical applications.
• Clinicians should be aware that traditional localization methods may lead to underestimation of eye size, potentially impacting treatment planning for intraorbital foreign bodies.