More light is always a help. More light will cause your iris to lessen the size of your pupil which in turn makes your vision keener.
For being able to hold things with my aging hands one of my power tools is a lathe. This has helped by making chisel handles that are more comfortable for me to hold.
Some of my saw and plane totes have also been modified to feel better in my hand.
For marking a folding rule's hinges can hold it above a piece being marked allowing a square to be moved without affecting the rule's placement.
Yesterday while changing the blade on my bandsaw it was very helpful to have a pair of clip on readers. They are made to clip on to a regular pair of glasses. Trying to crane my neck using my bifocals under the table while setting the blade guides wasn't going to work. These were found in the needle point section at Michael's Arts and Crafts store. They are likely available from many other retailers. They also come in handy when filing a saw's teeth. They also flip up to return to normal vision when needed.
Another handy item is a rare earth magnet on the end of a stick. Mine rests on a pole holding a lamp over my bench. It comes in handy to pick up dropped items when your back isn't as young as it used to be.
jtk