So far I (foolishly) tried to convince myself that the contrast of my MPF-1 Blue LED display was good enough and had good readability - however, luckily I am not that good at prolonged periods of self-deception, and my inner critic kicks in. So, something had to be done to increase the contrast - after all, my eyes are not that young anymore.

Blue Lens Filters are kind of hard to come by, but there is something similar - Gel Filters. Supposedly, they are for party / disco spot lights. What can I say - the difference is stunning, like night and day: