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Professional Adjustable Optical Optic Eye Optometry Test Trial Lenses Frame,Optometry Optician Trial Lens electronics3 to be able to lockProfessional Adjustable Optical Optic Eye Optometry Test Trial Lenses Frame,Optometry Optician Trial Lens Features & Specifications: Range of PD adjustments: PD of both eyes: 48~80mm; Left or right PD: 24? 40mm; Minimum Calibration Value: 1mm. Axial calibration on each disc: Left disc: 120~0~135, Right disc: 45~180~60, Axial calibration increases counter clockwise along the lens frame axis, and the calibration distance is 5. Inner diameter of lens