We do offer an option to set applications as private when uploading an app to the App Store.
To enable this feature:
Navigate to the App Details of your application in your developer account
Select 'Private App'
Click 'Update App'
Once updated, you will see an option under the application name labeled 'Users'. Click this option to view/manage the accounts that will have access to your application.
*Notes: Only registered Vuzix App Store email addresses will be allowed access to the application. Private applications are required to follow the same approval process as public applications upon submission.