About this item:
104 PCS Trial Lenses - The 104 pcs trial lenses are made of glass with a metal rim, which gives accurate diopter and a high light transmittance, very important for optometrists and vision testers. 
Large Metal Rim - Features a 36 mm inner diameter and 38 mm outer diameter, providing a wide field of vision, making the test result more accurate. 
Easily-Distinguished lenses - Including 104 pcs lenses in the case, with 72 pcs of spherical lenses, 24 pcs of cylindrical lenses, 4 pcs of prismatic lenses, and 4 pcs of accessories. Each lens handle is engraved with markings, and the lens power is printed on the tray. 
Aluminum Box - This case is made of premium aluminum with a combination lock. The lock comes factory set to 000. Open it by pushing the button outward and reset the combination to whichever 3 digits you like while pushing the button inward. Please remember the password you set, or you will no longer be able to open or close it. 
Widely used - It is very useful for optometrists, vision testers, and household use to examine a patient’s refractive error - including hyperopia, myopia, presbyopia, astigmatism, strabismus or color blindness.