In fact, it is possible to use the viewfinder with glasses. Even sunglasses.
You can also adjust the diopter in the viewfinder if your eye can not focus.
Unfortunately, using RAW will not help you recover an underexposed or overexposed photo. Each pixel to the left or right of the histogram is lost information and no calculation can retrieve it.
If you want to shoot in auto mode, it will work fine in most scenarios. But if not, you can use exposure compensation and set the meter to the left (or right) to expose less (or more). Then look at the histogram if there is lost information.
You can try opening priority to control the depth of field of your photos. It is almost as easy to use as the automatic mode.
Auto priority and aperture priority work relatively well in most scenarios, if you use exposure compensation when the histogram indicates a loss of information.