科學的精神在於做實驗時固定其他的變數，而單取一個變數來做觀察, 而這個實驗觀察的 變數在於材質，所以折射率是控制變數，借用您提供的資料, Name of Material Index of Refraction Tensile Strength Cr-39 (CR) 1.5 15.6 kgf Phoenix (Trivex) 1.53 61.2 kgf Polycarbonate(PC) 1.58 44.9 kgf 此外Tensile Strength(拉力測試)與 Impact resistance (撞擊測試)本來就不完全相同 。從實際面來看, 如果CR-39材質較好, 為何歐美先進國家幾乎都是用PC材質的鏡片? 再 借用您提供的資料 Until finally in 2001, returned a giant company opthalmik lens maker, PPG Industries, utilizing the latest invention called monomers Trivex to meet user needs glasses but polycarb. Called Trivex remember there were 3 excellent feature of this material is superior optikalnya quality, super-lightweight and super-powerful in itsclass. Then what is the difference between Polycarb lenses and Trivex? In order to more easily and clearly, let us consider the comparison table is based on the parameters of the lens lens opthalmik below: Table 1 Polycarbonate TRIVEX Monomer Urethane Urethane-based pre-polymer The process of making Thermoplastic Thermosets-plastic combinations Refractive index 1,589 1:53 Abbe value 29 to 30 43 to 45 Tensile strength / power stretch 44.9 kgf 61.2 kgf Density / weight of the lens in the air 1:20 g/cm3 1:11 g/cm3 Light Transmission 90.1% 91.4% An eye for durability chemicals (acetone) Sensitive Not easily swayed Drop ball test / impact strength 18x broken 18x cracks UV cutoff 385 nm 380 nm http://optikonline.info/2009/03/06/polycarbonate-atau-trivex.html Figure 1. Chemical Fluid Effects (Acetone) Figure 2. Drop Ball Test (ki-ka: CR-39, Polycarbonate, Trivex) Figure 3. Chromatic Aberration Trivex lens material marketed under the name Phoenix and Trilogy. Phoenix is a trademark issued by Hoya Lens, while the Trilogy by Younger Optics. --

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