A Novel Standardized Distraction Test To Evaluate Lower Eyelid Tension Using Three-Dimensional Stereophotogrammetry

QUANTITATIVE IMAGING IN MEDICINE AND SURGERY(2021)

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摘要
Background: Standardized pre-operative assessment of the lower eyelid tension is essential to determine the optimal surgical technique. However, quantitative analysis using the conventional distraction test is inaccurate and user-dependent. Our purpose was to introduce a novel, standardized three-dimensional distraction test for measuring lower eyelid tension and to determine its standard values in a Caucasian population.Methods: In 94 participants (50 men and 44 women; age 21-85 years), a 15.9-g weighted eyelid hook was used to pull down the lower eyelid. Two three-dimensional images were acquired with a VECTRA M3 stereophotogrammetry device-one in the neutral position without a hook and the other in the distracted position with the eyelid hook. The images of all participants in both positions were measured twice by a single observer.Results: There was no clinical (>1 mm) or statistically significant difference between the two repeated measurements of all the inter-landmark linear distances in both positions (P >= 0.05, respectively). The mean distracted displacement between the neutral and distracted position for margin reflex distance was 5.50 +/- 1.53 mm, without any age-specific difference (P=0.08); however, a significant gender-specific difference was observed as men had significantly greater displacement than women (P<0.001).Conclusions: Our proposed standardized three-dimensional distraction test for assessing lower eyelid tension using an eyelid hook and a simple landmark-based system seems to provide high reliability. This novel and simple method might be helpful for the preoperative planning of eyelid surgeries.
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关键词
Distraction test, lower eyelid tension (LET), standard-weighed eyelid hook, three-dimensional stereophotogrammetry, landmark system
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