A Proposal of Digital Photo-Biometry of MRD1 and New Levator Function Test

디지털 사진을 이용한 MRD1의 계측과 새로운 위눈꺼풀 올림근 근력 측정법의 제안

  • Lee, Seungkook (Department of Plastic and Reconstructive Surgery, Inje University Seoul-Paik Hospital, Inje University College of Medicine) ;
  • Park, Sung Gyu (Department of Plastic and Reconstructive Surgery, Inje University Seoul-Paik Hospital, Inje University College of Medicine) ;
  • Baek, Rong-Min (Department of Plastic and Reconstructive Surgery, Seoul National University Bundang Hospital)
  • 이승국 (인제대학교 의과대학 서울백병원 성형외과) ;
  • 박성규 (인제대학교 의과대학 서울백병원 성형외과) ;
  • 백롱민 (서울대학교 분당서울대학병원 성형외과)
  • Received : 2006.03.16
  • Published : 2006.07.10

Abstract

Purpose: The history of biometry dates back to ancient Greek. The ideal body ratio from biometry is used as a guideline in many works of art. Biometry is also used as a medical standard to determine normal or abnormal. Since the biometry of face is so complicated, many surgeons tend to regard preoperative evaluation as a bother and substitute medical records with some photographs. We introduce a new method to measure $MRD_1$ and levator function using digital photographs, which becomes widely used lately. Methods: $MRD_1$ can be measured with the primary-gaze-view photo which is magnified by PhotoshopR 7.0.1. The distance from coneal reflex of ring flash to upper eyelid margin is converted to mm-unit using the piece of ruler attached on the patient's face. Levator function can be measured with up-gaze-view photo and down-gaze-view photo which are superimposed on another. The excursion distance of upper eyelid margin (a) and the excursion distance of eyebrow (b) are measured respectively. The levator function can be assessed through subtraction of two values (a-b). This method is simple and precise and can be applied directly to patient without photos. Results: Using magnified digital photos and computer, this method can reduce personal error and instrumental error. Taking some digital photos doesn't take long time, so it can reduce the effort of preoperative evaluation and discomfort of patients. Conclusion: Digital photo-biometry is useful for retrospective study. Especially reducing personal error, it is useful when the number of specimens is huge. New levator function test is much more useful for Asian-specific eyes than Berke's method allowing frontalis muscle compensation.

Keywords

Acknowledgement

Supported by : 인제대학교

References

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