varifocals are expensive because Varifocal lenses are the most complex off all lenses. They require different equipment and technology to manufacturer and a lot of research and development goes into new designs and products.
Perhaps, opticians hike the prices to pay for their expensive shops! My last optician wanted to charge me 730 dollars for a pair glasses. They were rimless frames with Zeiss lenses. That was when I ended our relationship and tuned to buying them online. I've never looked back.if you want to save more money, you are totally can shopping online.