I might be wrong but thought there were round CRT displays on some very muc h pre-PC computers.
it was compromised when thick faced CRTs came in, removing the need for a s eparate glass shield - the efficacy of which I doubt. Suddenly you got 1.5-
2" less picture per given screen inches. It then changed again with LCDs, w hich give more picture per inch than thick faced CRTs.NT