If you are having difficulty seeing the holes in the grid when you are perforating or you think your work could be neater try using a craft light and a good magnifying glass. The best sort of light is one that replicates natural daylight.
You can buy light and magnifier separately or together in one unit. They can be clipped on to a table, mat or floor standing.
You can also buy magnifiers that clip on to your glasses, or on to your head with a headband.
In my opinion both light and magnifier are absolutely essential equipment for parchment crafters.