232 Pcs Optical Lens is very useful for optometrists, vision testers and household use to exam a patient's refractive error - including hyperopia, myopia, presbyopia, astigmatism, strabismus or color blindness. Specification: Packing number:232pcs Measuring range:SPH:0.12-20.00DS Material:High-quality optical glass CYL:0.12-6.00DC PRISM:0.5-8.0 Chip size: diameter 38mm,clear aperture 26mm Product size(mm):503 380 75 Weight :4kg Feature: - Professional optometry test frame, ultralight glasses trail accessory. - The lens uses high-quality optical glass with high light transmittance. - With high accuracy, universal and apply to various glasses, practical tool. - Precise workmanship, humanized designs, no harm for your eyes or skin. - The design of the tray facilitates the insertion of lenses and protects them from wear. - Case with combination lock can provide privacy and security. - Each lens is equipped with a handle with a degree, which makes it easy to reach and identify. Package included: 1x optometry box✓?WIDE APPLICATIONS?Optometry frame is widely used, suitable for visual inspection in optical shops, hospitals, ophthalmology, schools, factories and mines, etc,offers all the adjustments to ensure a proper and comfortable fit onto your patient. ✓?26MM CLEAR APERTURE?The handle degree is sprayed on one side, which is more convenient for use and inspection. The axis marks of the cylinder and prism are directly engraved on the mirror surface, and the axis position will never change. ✓?GAP WIDENING?The top and bottom inserts are more convenient, and the standard slot effectively protects the lens. ✓?EASILY-DISTINGUISHED?Colorful plastic rims are helpful for distinguishing lenses with different functions. Each lens handle is pasted with markings, and the lens power is printed on the plastic lens tray. ✓?TRIAL LENSES?The 232pcs trial lenses are made of glass with a plastic rim, which gives accurate diopter and a high light transmittance, very important for optometrist and vision testers.