Conclusions: In the early stage after phacoemulsification, the stability of the tear film is reduced. Adding sodium hyaluronate eye drops can restore tear film structure and improve corneal surface regularity, and a 0.3% solution of sodium hyaluronate eye drops is more effective than a 0.1% solution.
This abstract caught my eye partly because they studied the effect of two different HA (sodium hyalurate) concentrations in eye drops - 0.3% and 0.1%. Those aren’t the only major differences between the various HA drops on the market, but concentration certainly is an important factor.
Frustratingly, in the US, we cannot readily learn the HA concentration in most over-the-counter eye drops because the FDA-mandated labeling for OTC drops does not allow HA to be listed as an active ingredient. We hope this will eventually change. Meantime, we try to keep up to date information about these concentrations by asking the manufacturers.