Abstract: Disclosed is a headset for monitoring periocular humidity, the headset including a housing configured to be positioned on a user's face and defining a periocular air space. The headset includes a humidity sensor configured to measure a humidity of air within the periocular air space, and an ophthalmic testing unit configured to measure a physiological parameter of an eye of the user. The headset further includes a processor coupled to the humidity sensor and the ophthalmic testing unit. The processor is configured to receive the measured humidity and the measured physiological parameter, and determine an ophthalmic condition based on the measured humidity and the measured physiological parameter.

Abstract: A self retaining shim for mounting between two surfaces is made of plastic and engages a projection from one of the surfaces on which the shim is to be mounted. The shim has inwardly directed deflectable tabs projecting into an aperture for engaging the projection to hold the shim in place while the two surfaces are joined.