Find answers about Lens Authenticity & Verification and common questions & concerns of Go-Optic.com customers related to optical, vision, ordering information and more.
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The accuracy of a prescription may be verified with a lensometer reading performed by an optical store or eye doctor's office. A lensometer should be properly calibrated before use to help ensure an accurate reading. Most lensometers will produce a reading receipt of the lenses to verify lens accuracy. Transposed or prescriptions within national tolerance are considered accurate. If the prescription lens received is inaccurate, please see the Experiencing Vision Problems section for details.
A prescription may be considered within tolerance when within the national optical tolerance guidelines. All prescription lenses provided within the national optical tolerance guidelines per ANSI Z80.1-2015 standards are considered accurate. Digital (Freeform) lenses are known to be more accurate and truer to the prescription than tradition non-digital lenses.
Prescriptions with astigmatism include a cylinder (CYL) power that may be transposed and appear different than the original prescription but will still be considered the same/accurate. The following steps are taken when transposing a prescription.
Lenses (mostly progressive lenses) have clear watermarks or laser-etched markings on them to identify the manufacturer and power of the lens. These watermarks can be difficult to see with the naked eye unless under certain lighting conditions. Although the watermarks cannot be removed as they arrive this way from the manufacturer, they generally don't cause distractions due to their (soft-focus area) placement. Please see example for details.
Photochromic or sun-sensitive lenses that are intended to get dark under the sun, must be exposed to direct UV sun rays for around 60 seconds before getting darker. The lens may not get dark if not exposed to direct sunlight or when in a car. A simple test may be performed to verify the darkening properties by following the steps below.
The lens that was covered should remain clear, whereas the uncovered lens that was exposed to sunlight should be darker. If both lenses remain clear after this test, then the lens is not sun-sensitive or photochromic.
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