Not all, but most customers tend to be in one of two groups. The "ah-ha" group that feels immediate relief or the more subtle group that observes symptom changes over 30 days or so.
Some customers can selectively wear their eyeglasses when shopping or working on the computer. Other customers need to wear them all day every day. A small group of customers report no relief (or can even experience new symptoms) when the eye-wear is taken on and off frequently or worn sporadically.
Our return policy is lenient so that you can take time to make your own observations and wear them for optimum efficacy for your individual needs. Please let me know if you have any other questions or need an extension.