266pcs trial lens sets are widely used by hospital ophthalmologists and opticians to check people's refractive conditions: hyperopia, myopia, presbyopia, etc. Product name: 266pcs Trial lens set Product material: leather case plastic ring optical glass Single-piece size: outer diameter 38mm, clear aperture 26mm Standard Packing Quantity: 266PCS Measuring range: SPH: 0.12-20.00DS Product net weight: 5kg Optometry box size: 59 34 6cm 23.2 13.4 2.4inches Suitable for: Optical shop, vision care center, hospital, optometry training center, check hyperopia, myopia, presbyopia, astigmatism and strabismus?Widely used?: The optometry box is widely used in glasses shops, vision health centers, hospitals, and optometry training centers to check hyperopia, myopia, old flowers, astigmatism and strabismus. ?Advanced Optical Glass?: The light pores of the audition group are 26mm, the field of view is wide, the light transmission rate is high, easy to clean and maintain, and more comfortable wearing. ?Strong and durable?: This optometry test lens has a longer service life, sturdy durability, high -quality metal accessories, and the password lock protection lens is prevented from being misunderstood. ?Clear and convenient mark?: The handle is marked with the degree of handle, which is convenient for use and inspection the mirror is engraved with axis label, which is not easy to change the axis position. ?Optical Trial Lens Set Kit?:Optical Trial Lens Set Kit,Insert Optometry Box,Trial Lens Set BOX,Optometry Lens Case,High Light Transmittance,Long Service Life,26Mm Lens Clear Aperture.