A method, an apparatus, and a computer program product render a graphical user interface (GUI) on an optical see-through head mounted display (HMD). The apparatus obtains a location on the HMD corresponding to a user interaction with a GUI object displayed on the HMD. The GUI object may be an icon on the HMD and the user interaction may be an attempt by the user to select the icon through an eye gaze or gesture. The apparatus determines whether a spatial relationship between the location of user interaction and the GUI object satisfies a criterion, and adjusts a parameter of the GUI object when the criterion is not satisfied. The parameter may be one or more of a size of the GUI object, a size of a boundary associated with the GUI object or a location of the GUI object.