Hi Sheng-BO,

What language are you using to connect to the API? It looks a bit like Excel. If it is a language that connects to the API using COM instead of .NET, then it could be that the intellisense is not reporting the full information. The Field Curvature/Distortion analysis has a full IAS interface as provided in the ZOS-API Syntax Guide here: ZOSAPI.Analysis.Settings.Aberrations.IAS_FieldCurvatureAndDistortion Interface Reference.

I inspected the Field Curvature settings interface in Matlab, and have confirmed that all settings are available, as shown below. Note: you can right-click the image and open it in a new tab for a higher res view.

You should be able to use any of these settings in your own code. For example, to change the value of Maximum Curvature, you would use a command similar to this: Curvature_setting.MaximumCurvature = 20.0. 

Let us know if you have any trouble with this!

Best,

Allie

thank you