Varifocals should be banned for pilots! I've recently spent a fortune on these vision distorting lenses on recommendation of my AME..they are totally unsuitable for avaition use. Peripheral vision is non existent, you have to turn your head to get get a clear view..ridiculous. Go for Bifocals, the lower section can be prescribed for map reading distance and the upper main section for the instrument panel. In my case I look over the top for long range/ landing.