We thank Dr. Villanueva for his interest in our study . We agree it would be interesting to explore a way to assess arc curvature. However, this was out of the scope of our study. We aimed to assess the accuracy of eyeball measurement rather than establishing a new way for assessment. We have utilized goniometry (standard and using an app) as it is the tool most used in current clinical practice. The primary aim of the study was to compare eyeball estimates to goniometry measurements. Validating the use of app and standard goniometry and testing inter and intra observer reliability was to further strengthen the argument for the reliability of measurements obtained by goniometry assessment.