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Core Functionality: This Round Optical Cross Cylinder Lens Tool Set is designed specifically for optometry use, enabling precise correction of cylindrical lens by placing the two cross cylindrical lens axes at 45 degrees, ideal for detailed adjustments Quality: Crafted from copper and glass, the optical instruments ensure reliability and consistent performance during optometric testing and lens evaluation processes Compact Design: Measuring approximately 4.25*1.50*0.16 inches, this lightweight optometry tool set offers easy handling and portability, suitable for professional and educational use in various clinical and learning environments Versatile Usage: Ideal for optometrists and students, this cross cylinder trial kit supports accurate testing and optical instrument calibration, essential for and care applications User Convenience: the handle length and ergonomic design facilitate comfortable grip and precise manipulation during axial direction correction, enhancing testing accuracy and user experience in professional optometry settings