Unique reflective lenses to auto-calibrate eye tracking system

Example embodiments include a lens having an IR-reflective coating that is selectively applied to form a variable infrared (IR) interaction pattern on the lens. The variable IR interaction pattern mayvary in the manner it interacts with IR wavelengths, so as to provide a machine -readable code when the lens is illuminated by IR light. Accordingly, variable IR interaction patterns may be used to identify particular lenses. Accordingly, a glasses-style, modular, head-mountable device (HMD) may identify which of a number of different possible lenses are currently attached to the HMD, and updatecertain processes according to the lens or lenses is or are attached. For example, an HMD may calibrate an eye-tracking process according to the particular lens that is attached. 示例实施例包括具有选择性施加来在镜片上形成可变红外(IR)交互图案的IR反射涂层的镜片。可变IR交互图案可以以其与IR波长交互的方式变化，以便当镜片被IR光照射时提供机器可读代码。因此，可变IR交互图案可以被用来标识特定镜片。因此，眼镜式、模块化、可头戴设备(HMD)可以标识若干不同的可能的镜片中的哪些镜片当前被附接到HMD，并且根据被附接的一个或多个镜片来更新某些过程。例如，HMD可以根据被附接的特定镜片来校准眼睛跟踪过程。