There are regulations that specify forward visibility and bridge height is related to that.
Cameras are used of course, but the regulations refer to human vision, not camera vision I believe.
"The view of the sea surface from the conning position shall not be obscured by more than two ship lengths, or 500 m, whichever is the less, forward of the bow to 10° on either side under all conditions of draught, trim and deck cargo;"
etc.etc...
https://mcanet.mcga.gov.uk/public/c4...gulation22.htm