Why not set yourself up with both?
Buy a MGM scope base and XS Sights backup ghost ring sight with Leupold QRW rings you can quickly install the scope or remove it and install the ghost ring sight.
Here is a pic of my Contender in 375JDJ scope is an older Leupold Vari X 111 2.5-8X36mm that I had the new Boone & Crockett reticle installed in I mount it onto a MGM scope base with the Leupold QRW rings I mentioned earlier the rear iron sight you can see just in front of the front scope ring is a stock T/C rear adjustable sight all I need to do is pop the scope off and I'm good to go.
The forth barrel up from the bottom is my 22" T/C Custom Shop 45-70 barrel it has a Leupold Vari X 11 1-4X duplex reticle scope (now a new Redfield 2-7X scope) again mounted with Leupold QRW rings and once again you can see the stock rear iron sights I just need to pop the scope off and I am using iron sights.
My eyes are rapidly failing on me as well but this set up still works for me my next move is to switch over to the XS ghost ring sights I have them on 2 of my rifles now a 21" barreled Rem 700 LSS in 375RUM & my Marlin 1895GS in 45-70...
Top gun = Marlin 1895GS with XS sights low Weaver backup ghost ring mounted on rear Warne 2 piece base.
Rem 700 QRW 2 piece bases XS Sights tall Weaver backup ghost ring sight