- Adjustable Pupillary Distance: Accommodates a binocular pupillary distance range of 54–70 mm, with a minimum scale value of 1 mm, ensuring a comfortable fit for various users. - Precise Axis Scale: Features a left and right axis scale of 165° to 0° to 180° to 25°. The counterclockwise graduation on the axis scale allows for easy adjustments, with a marking interval of 5°, enhancing accuracy in lens positioning. - Effective Frame Aperture: The frame includes an effective inner aperture of Φ8 mm. It can hold up to 4 lenses in both the left and right frames (3 in the front and 1 in the back), making it versatile for different lens combinations. - Rotational Flexibility: Offers a 360° rotation capability for the optical axis of the lens within the inner ring of the frame. The optical axis maintains a non-parallel alignment to the frame's geometric axis of ≤ 2.5°, ensuring optimal performance and alignment. Use Scenarios: 1. Optometry Clinics: Ideal for eye care professionals conducting precise measurements for prescription lenses. 2. Optical Retail: Perfect for fitting customers with the right lenses and ensuring accuracy in their visual aids. 3. Educational Institutions: Useful in laboratories for students learning about optics and lens configurations. This product combines functionality and precision, making it a reliable choice for both professionals and students in the field of optics.