That's astigmatism not presbyopia. I have the latter. Sounds like you have the former.Actually this is the main reason I do not like a RDS. My eyes are over 6 decades old. They don’t work well with a RDS at all. They work with a peep, a traditional scope, add they work reasonably well with the ahi Biz sights.
A dot looks like a slash. It can be corrected to look like a dot, but then a straight line at the periphery of my vision takes on a curve.
Peace favor your sword,