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Ultrasound Int Open 2016; 02(01): E8-E12
DOI: 10.1055/s-0035-1565243
Original Article
© Georg Thieme Verlag KG Stuttgart · New York

Determining Tarsus Curvature in Relation To Direction of Gaze Using Non-contact Ultrasound Video Assistance

T. Schrom
1   Head and Neck Surgery/Plastic Surgery, Clinic for Oto-Rhino-Laryngology, Bad Saarow, HELIOS Clinics Bad Saarow, Germany
,
R. Amberg
2   Institute for International Media and Computing, Economics II, University of Applied Science, Berlin, Germany
,
F. Bast
3   Department for Otolaryngology, AMEOS Klinikum Haldensleben, Haldensleben, Germany
› Author Affiliations
Further Information

Publication History

received 03 May 2015

accepted 31 October 2015

Publication Date:
15 January 2016 (online)

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Abstract

Purpose:

Plastic surgery on the eyelids for the purpose of aesthetic or functional correction requires precise knowledge of lid anatomy. Changes in the tarsal curvature of the upper eyelid relative to line of vision are important, particularly when a surgical correction of paralytic lagophthalmos is undertaken. We used a computer-based image-processing algorithm to establish a relationship between changes in the curvature of the tarsus relative to the line of vision.

Material and Methods:

A dynamic, ultrasound examination of the upper eyelids of 100 participants (100 eyes) was performed transpalpebrally using a 7.5 MHz scanner with the patient looking straight ahead, away from and towards the midline of the body. A computer-aided examination of the upper eyelid tarsus was then performed, followed by the calculation of the radius of curvature of the tarsus relative to the line of vision in each position.

Results:

Using regression of a Taylor polynomial, the shape of the tarsus was mapped by a quadratic function, and the change in tarsal curvature relative to line of sight could be demonstrated.

Conclusion:

With objective evidence of change in the tarsal curvature relative to the line of sight, this may influence the treatment of pathological changes in the upper eyelid.

Key words

eye - face - ultrasound
 

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