Export contact lenses have no degree of transparency

Conversion of Myopia Contact Lenses, conversion of contact lenses and optometry. The degree of optometry is the degree of frame glasses, the degree of frame glasses and contact lenses is not the same, the distance between the back vertex of the frame mirror and the cornea, the yellow man is about 12 mm. According to the number of refraction, frame glasses and Aqua blue plate contact lenses, Myopia color contact lenses conversion. The degree of contact lenses has a conversion formula, contact lens diopter = frame glasses diopter ÷ (1-0.012× frame glasses diopter), 1 diopter is equivalent to the usual 100 degrees, the diopter of myopia is negative, the diopter of far-sight is positive. 0.012 is the distance between the frame glasses and the highest point of the black eye, in meters. There is a conversion formula for the prescription of frame lens and contact lens: Fo=Fs/(1-dFs) Fo - Contact lens degree Fs - refraction degree d - Distance between frame lens and cornea (0.012m) For example, if the frame lens degree is -4.00D and the distance between the frame and the contact lens is 12 mm, the degree of the contact lens can be converted to Fo=-4.00D/[1-0.012 (-4.00)]=-3.82D, which can be given by pressing -3.75D.