Would these two supplements, Vision Essentials Ultra and OcuXanthin, taken together be of significant extra benefit overall compared to either one alone? What is most important for us to know?

We can stand solidly behind your intuitive assessment and your rationalization based on the ingredient lists for the two supplements, that combining them could make for a more powerful combination that would meaningfully enhance the health benefits over either alone. They will, in fact, be synergistic to the extent that not only will dose levels be enhanced, their somewhat different composition will result in a wider array of useful ingredients being deployed. Through combined use, in this case, it will be more than the sum of the individual parts, as defines synergy.