In much of the US, eyeglass and contact prescriptions are regulated the same way as any prescription medication is. There must be a signed and dated prescription given by a doctor in order for lenses to be sold or created. Any retail outlet that ignores this is in violation of state law for most states. Not to mention, most optometrists offices have an auto-refractor that operates similarly in order to give the doctor a ball park starting point, and the results from that machine and the final prescription from the doctor are often significantly different. Not to mention, many online optical shops still contact your doctors office to confirm the prescription before manufacturing. There is extraordinarily little risk of this device being used to circumvent this process.
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In much of the US, eyeglass and contact prescriptions are regulated the same way as any prescription medication is. There must be a signed and dated prescription given by a doctor in order for lenses to be sold or created. Any retail outlet that ignores this is in violation of state law for most states. Not to mention, most optometrists offices have an auto-refractor that operates similarly in order to give the doctor a ball park starting point, and the results from that machine and the final prescription from the doctor are often significantly different. Not to mention, many online optical shops still contact your doctors office to confirm the prescription before manufacturing. There is extraordinarily little risk of this device being used to circumvent this process.