Do hyaluronic acid eye drops help dry eyes?

They help about as much as other artificial tears. A 2017 review of 18 studies found that most showed better results with hyaluronic acid drops for damage to the eye surface and for symptoms. When trials were pooled, hyaluronic acid did slightly better on tear production and slightly worse on how long the tear film lasted. The differences were too small to matter in practice.^[1]