I shoot indoor 50' 4 position postal matches in the winter and all of the older shooters are having trouble with blured vision through our 24x scope. We're usually OK at offhand but in kneeling sitting and prone the rings start to blur, and we see double rings. We have used different scopes and a parallax compensating lens. The club ownes one really good rifle that we all shoot. Is this just old eyes or is there a cure? Thanks for any help, PK.