Pure Encapsulations turns up on a dry eye site for two reasons. The first is the VisionPro line, which is eye specific. The second is that plenty of people managing a long term condition already keep the brand's general supplements in the cabinet, so it is convenient to buy both in one order.
For the eye formulas, decide by what your routine already covers. If you take a separate multivitamin, VisionPro Nutrients may overlap with it. If you do not, it consolidates two bottles into one. Tear Support and Macular Support are different formulations aimed at different parts of the catalog, so read both labels rather than assuming one replaces the other.
For magnesium, the choice is form and count. Citrate and glycinate are different magnesium compounds and people usually arrive with a preference or a recommendation. Larger counts and the liquid lower the cost per serving if you already know which one you use.
Supplements can interact with prescriptions and with each other, so bring the labels to your doctor or eye care professional before changing what you take.