Investigation of Wearing Comfort of Eyeglasses with Emphasis on Pain around the Ears

Eyeglasses are commonly used to correct poor vision and also need to be comfortable enough to wear. It is necessary to have a fitting at the time of purchase to determine the appropriate glasses position. Unfortunately, these fittings are usually performed based on the engineer´s experience and quantitative evaluation of the fitting process has not been well examined. In this study we investigate wearing comfort of glasses by measuring clamping force of various glasses frames and pain around the ears when wearing those glasses. From results of measurements, we found a relatively strong positive correlation between the clamping force and the pain around the ears, indicating that the pain degree increases with the clamping force. It is possible to reduce the clamping force and the level of pain around the ears based on measurement of head dimensions and adjustment or fitting of frame when purchasing eyeglasses.