Be ware of this company. They have scammy marketing practices, frequently make false claims on their website (like that their device cures all blindness, or completely replaces the cane), have a history of creating Reddit accounts to shill the product, encourage blind people to beg for charity rather than price the product reasonably (the glasses can't cost more than $200 to make, but are sold for $10000), if the device doesn't work for you they have a no returns policy, and worse.

eSight works primarily by enlarging something. It works very similar to a CCTV, it's just more portable.

I've been looking into esight myself, however, after reading so many negative experiences with them, I pretty much think that it might be best if I wait until bionic eyes are affordable and risk free to put in. The only thing keeping me from getting an operation, is that during my last visit to my eye doctor, he said I shouldn't get laser-eye surgery, since I might lose my vision completely. But when they give me a green light, I'm going bionic for sure.