Donegan OptiLOUPE® LP-1 OptiVISOR® Accessory Lens, adds 2.5x magnification and has a glass lens for Donegan Optivisors and similar headband magnifiers.
Head Band Magnifying at Rs 2150/piece | New Items in Aurangabad | ID: 2850211210655
Donegan OptiVISOR DA-5 2.5 X Magnification at 8"
Head Band Magnifier Optivisor Eye Loupe optivision | eBay