Frame: Clear Lens: Clear Light Transmittance: 92% Lens Strength: +1.5 The 312RX READER features lenses with bifocals moulded directly into the lens. Now you are able to read in a hazardous environment without having to remove your safety glasses. All bifocals lenses are made of polycarbonate, and provide 99% UV protection. These magnifiers are manufactured to our strict quality assurance guidelines and are tested in-house using our proprietary quality control system, D’Arassus, to ensure they comply with the optical requirements of Australian Standard AS21987 and meet the medium impact resistance and transmittance requirements when tested to AS1337.1 2010 Personal Eye Protection. Our ready readers are certified to meet these requirements under SAI Global License number PPE40002. Guide to the Use of Reader Reader Bi-FocalsReady reader bifocals are only intended to provide a temporary solution to your eye protection needs. The lenses in these glasses are NOT prescription lenses. They do not replace the need for certified prescription eye protection. They are not intended to correct any problems with your eye sight. Poor vision may result from the need for correctly prescribed glasses or a disease of the eyes. Many eye diseases show no external signs or symptoms in the early stages; therefore you should have your eyes examined regularly by an Optometrist or Ophthalmologist.