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Eyeglasses Development for Measuring the Upper Eyelid Levator Function

Kosuke Ogasawara, Risa Saito CO, Miyo Takano CO

Accurate measurement of upper eyelid levator function is critical in diagnosing and treating patients with ptosis. In this article, we introduce our new eyeglasses for upper eyelid levator muscle measurement, which are simple, reproducible, and stable. The measuring eyeglasses can be adjusted to fit the face size and interpupillary distance of patients ranging from children to adults. It also maintains sufficient space to hold the upper part of the eyebrow and is extremely lightweight, weighing only 29g. The optical part of the glasses has a graduated plate that allows the position of the eyelid to be read from the front and the position of the eyelid. It also has the advantage of easily measuring palpebral fissures and can thus be used to measure its width, MRD-1, and MRD-2.