Features1[Multi Adjustment Knobs] Optometry optician frame contains multiple knobs, which can be adjusted for interpupillary distance, nose pads, temples, etc. 2[PD Adjustment Range] PD 48~80mm adjustment range for both eyes of the trial frame; left and right PD24~40mm adjustment range; minimum graduation value: 1mm. 3[360 Rotation] The lens of the optical trial frame rotates 360 around the optical axes in frame, with high quality professional design and more flexible use. 4[Lightweight] Weight of the optometry frame is very light, the net weight of the product is about 75g/2.6oz, and it will not feel heavy when wearing. 5[Multi Application] Optometry frame is widely used, suitable for visual inspection in optical shops, hospitals, ophthalmology, schools, factories and mines, etc.SpecificationItem Type: Optometry FrameMaterial: AlloyFrame Inner Diameter: Approx. 32.5mm/1.2inColor: Black + SilverPupil Distance (Abbreviated PD) Adjustment Range:Eye PD: Approx. 48-80mm / 1.89-3.15in; Left and Right PD: Approx. 24-40mm / 0.94-1.57in; Minimum Graduation Value: Approx. 1mm/0.04inAxial Indexing of the Dial:Left Indexing Disc: 120~0~135Right Indexing Plate: 45~180~60The degree of rotation of the lens around the optical axes in frame: 360Adjustable Range of Nose Pads: Length: Approx. 0-14mm / 0-0.55in; Angle: 0 ~ 30Left and Right Frame Leg Length Adjustment Range: Approx. 98-135mm / 3.86-5.31in (Data May Have A Little Error)Package List1 x Optometry Frame