A novel standardized distraction test to evaluate lower eyelid tension using three-dimensional stereophotogrammetry

Area of Science:

• Ophthalmology
• Plastic Surgery
• Biomechanical Engineering

Background:

• Accurate lower eyelid tension assessment is crucial for surgical planning.
• Conventional distraction tests are unreliable and subjective.
• A novel, standardized method is needed for quantitative lower eyelid tension measurement.

Purpose of the Study:

• Introduce a novel, standardized 3D distraction test for lower eyelid tension.
• Determine standard values for this test in a Caucasian population.
• Enhance preoperative assessment for eyelid surgeries.

Main Methods:

• Utilized a 15.9-g weighted eyelid hook to distract the lower eyelid in 94 participants.
• Acquired 3D images using VECTRA M3 stereophotogrammetry in neutral and distracted positions.
• Measured inter-landmark distances twice by a single observer to ensure reliability.

Main Results:

• Demonstrated high reliability with no significant difference between repeated measurements.
• Found mean margin reflex distance displacement of 5.50±1.53 mm.
• Observed significantly greater displacement in men compared to women, with no age-specific difference.

Conclusions:

• The proposed 3D distraction test is reliable and standardized for assessing lower eyelid tension.
• This novel, simple method aids in preoperative planning for eyelid surgeries.
• Provides objective, quantitative data for surgical decision-making.