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Progressive safety glasses (also known as multifocal lenses or no-line bifocals) allow you to enjoy seamless vision (no awkward transitions), instead of having two viewing zones, as bifocals do and three as trifocals do.
Let's you see near (like reading a newspaper or book), far (like driving), and in between (like browsing a website on your computer) without changing your prescription safety glasses.
These Prescription safety glasses give you a clearer view without making you nod awkwardly.
SafetyEyeGlasses offers multifocal lenses with three Lens Usages,
✔️ Everyday Progressive - No line Bifocals
✔️ Digital Eye Strain Progressive - No line Bifocals
✔️ Sunglass Progressive - No line Bifocals
Generally, multifocal lenses are made up of “Polycarbonate” material. However, Safety Eye Glasses gives you the option to customize “Multifocal lenses” for lens material upgrade.
✔️ Plastic Cr39
✔️ Hi-Impact Polycarbonate
✔️ Premium Trivex
If you wanna see near (like reading a newspaper or book), far (like driving), and in between (like browsing a website on your computer) without changing your prescription safety glasses, the minimum lens fitting height should be 28mm - 30mm.
If you are looking to correct two vision prescriptions then bifocal is best to go with. Trifocal and progressive both are for Multi vision prescription, progressive provides more seamless vision resulting in easing eyestrain and natural correction.