My hands and fingers get cold easily so I do lose feeling in my fingers. To help, I wear 7 mil nitrile gloves. I wondered about feeling the markers you describe, but they look substantial with all the "varnish" (I got a kick out of the Brit calling Sally's "varnish").I hear you - my 65 yr old eyes certainly aren't getting better either. What I found after adding these was that I'd feel the 25 ft mark on my fingertip as I was retrieving the line, which would be a reminder to focus on the line at the other markers. Hopefully I don't lose feeling in my fingers next! Colors that give maximum contrast with the black coating on the sinking line are obviously the best. Sunshine affects the visibility just like with indicators.
Interesting how sense of feel compensates for reductions in other senses. I was joking last week with a friend that I appreciate the bass in music a lot more now because at least I can still feel the vibration from bass instruments, even is the highnotes are fading!!
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Thanks.