Prescription: If there's one singularly important takeaway about buying contact lenses, it's that you need a current eye prescription before shopping around. Why? Contact lenses are medical devices. Wearing ill-fitting or incorrect lenses could actually damage your vision. You should get an eye exam once per year and verify or update your contact lens prescription accordingly. Credible vendors won't fill prescriptions for contact lenses that are more than one or two years old. Speaking of credible vendors, per the Federal Trade Commission, it's illegal to sell any kind of contact lenses to someone without a legitimate prescription. This includes cosmetic lenses, like ones that simply change the color of your iris without correcting your vision. You may need a different type of contact lens based on your vision, like if you're near-sighted versus far-sighted or have astigmatism in one or both eyes. This is something only an eye doctor can tell you based o...
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