【104 Trial Lenses】： 104 trial lenses are made of glass and metal rims with accurate refraction and high light transmission, which is very important for optometrists and vision testers.
【Easily Distinguishable Lenses】：The box contains 104 lenses, including 72 spherical lenses, 24 cylindrical lenses, 2 prismatic lenses and 6 accessories. Each lens handle is engraved with a marking and the power of the lens is printed on the tray.
【Large Metal Edge】：36mm inner diameter and 38mm outer diameter for a wide field of vision and more accurate test results.
【Fine Aluminum Case】：The aluminum case is made of high quality aluminum with a combination lock. The combination lock is factory set to 000 and can be opened by pressing the button outwards and reset to any three digits by pressing the button inwards. Please remember the combination you set or it will not open or close.
【Widely Used】：It is ideal for optometrists, vision testers and home examinations of patients with refractive errors including farsightedness, nearsightedness, presbyopia, astigmatism, strabismus or color blindness.
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