What is used to apply mascara?

I barely even wear makeup so I got it wrong! how sad! ( but people say I look actually slightly better without makeup and i think that's true! so I don't really wear makeup!)

I normally don't even walk my dog without a full face of makeup, including mascara, shadow and eye liner. But I'm in the middle of two cataract operations, so no eye makeup until I finish my eye drops.☹️