Instant 20/20 the adjustable glasses you dial-in for to see better instantly! When you are in a bind and need to see, you need Instant 20/20. You adjust them and dial them in just the way you need them When you need to see clearly in any situation you need Instant 20/20. Perfect backup. Adjustable for near or far sighted. Corrects 90% of spherical errors. Light weight and durable. NOTE: These eyeglasses will not correct astigmatism. The lenses in these glasses are not for prescription lenses. DO NOT use for driving and/or other operating heavy machinery. You should have your eyes examined regularly by an Optometrist or Ophthalmologist. Eye examinations can detect health problems that have not signs or symptoms. NEVER disregard professional advice or delay in seeking it because of your purchase, receipt, or use of these glasses.