Originally Posted by AusCan
I'd guess they are for plywood panels to protect the glass in heavy seas or boat parties and/or to block the sun during the summer.
not likely part of the original design.
My fwd hatches have SS bars over the glass, as drunk protection. Yours may be something along those lines, added by a PO. I don't think protection from heavy seas is required, as the glass is safety glass, 2 layers of 1/8" with a membrane between, so plenty of strength for seas, but not enough to keep a misplaced elbow out of trouble.