With aperture sights I find that these days I have use OTC clear eye drops after each string or things get fuzzy. Think it is the natural drying of the the eyes as we age. Lots of drops and lots of blinking seem to work. I've found it has to the be the clear OTC eye drops and not the "get the red" type of eye drops, which seem to make the fuzzy worse after an hour or two. YMMV.

don1885,

As I posted above, my trouble has become worse in between the last couple of matches.

No amount of adjusting the rear iris or aperture changes has helped. Nothing has changed on my tube sight and I have the same exact problem looking through the other tube sights in our group. Even looking through just the iris with it removed from the tube I have the same problem.

All the advise about plumbing rear sights, aperture sizes, etc. is good information but has nothing to do with what I'm experiencing with my tube sight. 

I should mention that no one else I shoot with has this problem while using their tube sights so it definitely is something that's going on with my eyes.

I'm concerned about what my eye exam may reveal, but I sure don't want to give up shooting iron sight matches. 

JerryH

Following recent eye surgery I too experienced the same problem and discussed it with my surgeon. I had never worn eye glasses prior. He said it was similar to looking through a pair of glasses that were sitting a few inches in front of you - the focal length has shifted and consequently depth of view altered so objects were no longer in focus and especially looking through a tight aperture compounded the issue - he advised that a pair of lenses cut to a specific focal distance was a start and then letting your eyes adjust to them over time. You will need to ascertain what focal length best suits looking through particular sights and this is where you'll need to measure things on your rifle so you know the distance between your eye and the aperture etc. I would strongly recommend you discuss your problem with an optometrist as you'll find it a fairly common issue with us older folk 

It worked for me to some degree but first up start by aligning everything on your rifle to what the sight makers specify prior to getting lenses made and taking measurements (as often the optometrist will ask you what focal distance suits you say for reading or watching tv etc) that includes setting the sights vertical to the barrel and the ocular at the correct size to allow you some vision through it unaided. Measure the distance from your eye in normal shooting position and that's your starting reference with a known distance for the optometrist to work with.....this way is much easier than taking your long arm in to their surgery for them to check the measurements while you line up the reading charts with your smoke pole..  

The lens they made me is specific for my Sharps with Soule sights and Hadley eye piece - those glasses stay with the rifle as they are not much good for normal reading through them - different focal point.....but know your eyesight will probably never return to what is was once but in time and with the correct lens prescription (if needed) you should eventually overcome the limitations you now experience or at least understand the problem and learn to live with it - just another reason to get to the range more but this time its for medical reasons  good luck with everything and hope it gets sorted for you.....mine did in time

Someone made some modified eyecups a few years back that had a long bore lead through an intentionally lengthed threaded section of the disc (forward of the actual aperture hole) that helped eliminate "the fuzzies" for some shooters.
Don't remember if the article was in the ASSRA Journal, or in the SSE when Brett Boyd was still running it.

Cataract implants can cause your eyes to be a lot drier too.

It is only a minor PIA.  I would not cancel for fear of dry eye. You may be slightly more sensative to light too.  The implants do not filter UV anything like your natural lens reacts to it.

Its Cataracts
I had the 'Hairball in the centre of apertures' starting 25 years ago and initially kept trying to blow the 'dirt' out of the holes with air. I kept asking eye Doctors and none were anyhelp. not wanting to admit it was a Cataract problem , they would rather sell me glasses which never helped. 
The problem worsened thru time , hairball getting bigger and started obstructing the center of scopes and spotting scopes. Then I really started pushing for answers and finally got in to see a good eye surgeon who said my Cataracts were really growing fast now. After both eyes Cataract operations this year the hairball was totally gone but ops were not overly sucessful so I need glasses to focus , but no hairball and I can see to shoot fine with apertures. After operation , but Before I could get the glasses I could see thru apertures fine , but target was very blurry . reducing rear aperture hole size helped bring in the target more clearly , and now with glasses I can see sights and target well

Quote:

Don't all long range shooters try 10,000 yards at some point?