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Features:Trial lens set is a kind of ophthalmology calculating apparatus, used by hospital ophthalmology and glasses shop to exam people dioptric situation: hyperopia,myopia,presbyopia,astigmatism strabismus or colour blindness. It mainly consists of positive or negative sphere lens,positive or negative cylinder lens/ rism lens and accessory lens,etc.Specificatioin:Name:266 pcs Optical Trial Lens SetSize:75 x 35 x 5.5 cmPackage Included:160 x sphere lenses80 x cylinder lenses12 x prism12 x accessories2 x cross cylinders1 x Trial Frame