If you are young enough to ask the question, perhaps you can still use open sights for hunting. At my age, I can see the sights or the target but not both. On the range, this is OK because the sights are sharp against a blurred black/white target but in the field the target simply disappears completely when I focus on the sights. The ONLY answer for me when hunting with pistols is to use a 2X EER scope which puts the crosshairs and target into the same focal plane. Two of my S&W M629 pistols wear Leupold 2X EER scopes. They let me shoot like a young man again. Hint: scopes over 2X greatly reduce your field of vision and are difficult to use in the field.
Good shooting and be safe.
LB