Most opticians will do a load of eye scanning and eye health stuff these days and should easily pick up if there’s some concern.
It could be simple age changes though.
Mid 40s and my eyes are changing in frustrating ways and struggling to get decent prescription that works for glasses and contacts that’s ideal for most situations (and being trying VFs but I can’t get on with them. Certainly wouldn’t ride with them!).
As said above though, reaction time to light changes is something my optician mentioned that just gets a lot slower as we age, and the eye muscles get weaker.
With contacts I’m finding I have to blink a lot more to get clear vision, though probably due to toric lens because of astigmatism, and it’s never quite settled in the right place. Also, finding bloody “floaters” annoying in this way as so many of them now and they keep sitting right on central vision enough to block detail, so have to keep blinking to get them out of the way.
I dont know any details of your age etc but Macular Degeneration is the biggest cause of vision loss in adults in the UK.
I keep worrying about this as optician picked up on scarring on retina and gave me an amsler grid test. There are some wonky bits on the grid but nothing dramatic. They’ve considered it probably just old scarring and not an issue but warned to get seen straight away if it gets worse (the test you can do at home. Easy to get the grid off the Internet or from optician).