Visibility

Keeping track of stuff on the table can be a major challenge. The following work for me. 

Buy bright accessories. 
With the option of fluorescent plastics, orange is the new black. I can see the templates and markers, and they are all glowy around the edges. If they don't come bright, paint them, mark them, or otherwise make them stand out.

Count things. 
I brought 10 figures in this box, 8 dice, etc. it may seem neurotic, but I have left Farseers, Swamp Gobbers, snipers, and servo-skulls to the hands of the fates, so I can't help it. I try to label my boxes and containers so I know I have everything, then sweep the table clean of scenery. This often shakes loose the odd figure. Also, check with the folks you are playing with, asking them if you have everything 

Put things down in one place. 

Not a good color scheme for the visually impaired...

Then put them there again after you use them. I am not so good at this, especially with my tape measure, which contrary to the bright accessory advice above, is still matte black, and which I put down in the oddest of places, like right in front of me, and then I can't find it. I also have been known to look for something which is in my hand, though this is probably not due to vision...