Providing you an affordable acuity chart with excellent customer service is our top priority. The eSee Acuity Chart is not only among the best priced digital eye charts out there - it comes with top notch service too! As always, if you need to return the chart for any reason, you have 30 days from purchase to return it with no questions asked. Also, our on-staff OD is available to answer any of your questions if they should arise. We are so confident that you will have a great experience that you can try our chart without paying anything at: http://www.eseeacuity.com/free-trial.