When I converted my K-7 to infrared I ended up using this device:
Hoodman Live View Kit for all DSLR Cameras - HLVKIT (this or some other equivalent model). It enables me to handhold my camera and use live view under all lighting conditions. It is pricey. I suspect that all you need is the hood part, especially if you are using a tripod. As suggested in an earlier post, there is an elastic band accessory which would make its use easier. The hood is excellent.
Added: By the way, I wear glasses too. They're not needed when using the hood.