A prescription of -3.25 is low-to-medium, and there shouldn't be any restrictions. You can save money by not using high-index materials, and there won't be that much difference in thickness. CR-39 has first- rate optical properties, and is usually the least expensive option. "Pure" CR-39 has an index of 1.5, sometimes stated as 1.49. Materials with a different index my contain CR-39 mixed with other materials, but they're not "really" CR-39. --~--~---------~--~----~------------~-------~--~----~ Check us out at the oft-updated http://www.glassyeyes.com!
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