The cold bottle glasses. You get those because they're cheaper these days. You can get the same prescription on a much thinner lens. I did that for my kid. He has a pretty strong prescription in one eye, but his lens is no thicker than mine.
It adds a lot to the cost of the glasses, though. Easily $75 to just get half of the thickness.
It adds a lot to the cost of the glasses, though. Easily $75 to just get half of the thickness.