The design of the comfortable wearing Angle of sunglasses needs to comprehensively consider ergonomics, optical adaptation and dynamic scene requirements. The following is an analysis from the aspects of design principles, core elements and optimization directions:
First, design principle: Conforming to ergonomic curves
Facial contour adaptation
The frames of the glasses should fit the curves of the cheekbones, the bridge of the nose and the temples to avoid local pressure. For instance, Asians generally have lower nose Bridges. Therefore, it is necessary to add adjustable nose pads to the frames or use thickened silicone pads to reduce the risk of slipping.
The length of the temple and the bending Angle should match the head circumference. Generally, the rear end of the temple should be bent downward by 10 to 15 degrees to distribute the pressure behind the ear and avoid ear pain caused by long-term wearing.
Dynamic stability
The connection between the temple and the frame adopts an elastic hinge, allowing the temple to expand outward by 5 to 8 degrees to adapt to different head shapes. For instance, in sports scenes, the temples of the glasses need to have a certain degree of flexibility to prevent them from falling off due to the shaking of the head.
Second, core element: Optical and mechanical balance
Vertical Angle: Align your line of sight with the center of the lens
The center of the lens should be at the same height as the pupil. Usually, the lower edge of the lens is 1 to 1.5 centimeters away from the cheek to ensure an unobstructed field of vision. If the lens is too low, it may cause frown lines or nasal bridge fatigue. If it is too high, it is easy to block the view below.
The lens tilt Angle (the Angle between the lens and the vertical plane) is recommended to be 8 to 12 degrees, which can not only reduce the interference of ground reflected light but also avoid field distortion caused by excessive angles.
Horizontal Angle: Anti-side light leakage and ear comfort
The connection between the front end of the temple and the frame should form a natural arc and fit the contour of the ear. If the temples of the glasses are too straight, it is easy to cause concentrated pressure behind the ears. Taking a bend may press on the temples.
The width of the lens should cover the outer side of the cheekbone by 2 to 3 centimeters to prevent lateral light from leaking in and to avoid the frame being too wide and squeezing the temporal muscle.
Third, optimization direction: Scenario-based design
Sports scene
Add anti-slip silicone sleeves or adjustable straps to ensure a tight fit between the temple and the head. For example, when cycling, the temples of the lenses should be tilted backward by 15 to 20 degrees to reduce wind resistance and prevent the lenses from fogging up.
The lens adopts a curved design to reduce peripheral field of vision distortion and enhance visual stability in dynamic scenes.
Daily commuting
The weight of the frame should be evenly distributed. It is recommended that the pressure ratio between the nose pad and the temple of the glasses be 3:2 to avoid single-point pressure. For instance, lightweight materials (such as TR90) or hollowed-out designs can be adopted to reduce the overall weight.
An elastic cushioning layer can be added at the end of the temple to meet the needs of long-term wearing.
Special requirements
For those who work outdoors for long periods of time, the frame should have additional ventilation holes or adopt an open structure to reduce the feeling of stuffiness. For example, ventilation slots are designed on the side of the frame to promote air circulation.
When choosing sunglasses for myopia, it is necessary to consider the thickness and weight distribution of the lenses to avoid the frame sagging due to overly heavy lenses.
Fourth, verification and adjustment
User testing
The user’s facial data is obtained through 3D facial scanning to simulate the pressure distribution at different wearing angles. For example, test the pressure value at the contact point between the temple and the ear to ensure it is lower than 0.5N/cm².
During the dynamic test, observe the displacement of the lens when the head rotates to ensure that the displacement does not exceed 2 millimeters.
Iterative optimization
Adjust the bending Angle of the temple and the height of the nose pad according to the user feedback. For instance, if the user reports a strong sense of pressure on the bridge of the nose, the width of the nasal pad can be increased or memory foam material can be used instead.
Adjustable modules are designed for different head shapes, such as magnetic nose pads or telescopic temples, to enhance personalized adaptation capabilities.
Summary
The comfortable wearing Angle design of sunglasses needs to take into account both static fit and dynamic stability. By optimizing the frame curve, temple Angle and material distribution, optical fit and mechanical balance can be achieved. Future designs can integrate intelligent sensors to monitor the wearing status in real time and automatically adjust the Angle, further enhancing the user experience.
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