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I am glad that overall the structure of your eyes are OK. However, vision as we measure it on the Snellen chart is only one part of overall vision. There are corneal aberrations and contrast sensitivity that we do not measure routinely that can be affected.
Higher degree aberrations of the cornea are not something that you can see or treat easily. For instance, when some people have LASIK, their Snellen acuity is measured at 20/20, but they complain of poor vision. Some of that (when we measure on the wavefront scan) is caused by higher order aberrations of the cornea.
The same goes for contrast sensitivity. Both contrast and aberrations are also products of aging. Dry eyes can also cause corneal aberrations. Early macular degeneration can also cause contrast problems. Even though the Retinal specialist says that you do not have any membrane or edema, it doesn't mean you don't have a very early stage of degeneration that can manifest as contrast problems or color problems.
You put all that on top of glaucoma and that can complicate matters. I would treat the corneas for dryness with artificial tears. I would wear glasses with anti-reflective coating. I would also take vitamins (like Ocuvite) to help the macula as well.
Hope this helps and thank you.