Just got back from the range. I noticed I am beginning to have trouble picking up the sights on my M&P 9mm. They are standard three dot white sights. When I try to focus on the front sight, all is blurry and I see multiple dots. I am right eye dominant, and this happens if I shoot with both eyes open or left eye closed. I just passed the half century mark, and am chalking it up to aging eyes. I think I would do better with sights that don't have to line up between 2 blades, but maybe a front sight that would sit on top of the rear sight when aiming, such as a 'big dot' type sight. This pistol is used for self defense, not target shooting. Any opinions on sight options for 'aging' eyes would be appreciated, especially from the plus 50 crowd. Thank you for your help.