I have to agree with all of the above:
Super good lighting
Try using tweezers -- sometimes your fingers can block the lighting
Be sure the thread is trimmed with sharp scissors without any fuzzy strings to make it harder
Use a needle threader...ususally around $1 for 3 of them in a package at Walmart
Using a piece of an index card behind it would give good contrast
Use "cheater" glasses for extra magnification if needed
Eye sight can slowly get worse so please do have your eyes checked.
Give your hubby a big kiss from all of us too for being your threading hero