Instrument for measuring near point of convergence and/or near point of accommodation

摘要

An instrument for measuring near point of convergence (NPC) and/or near point of accommodation (NPA) is disclosed herein. The instrument includes at least one visual target disposed on or in the instrument, the at least one visual target viewable by a subject that is facing the instrument; a distance measuring device configured to emit one or more output signals that are representative of a distance between a surface of the instrument and a body surface of the subject spaced apart from the surface of the instrument; and a processing device operatively coupled to the distance measuring device, the processing device configured to receive the one or more output signals that are output by the distance measuring device and to calculate the distance between the surface of the instrument and the body surface of the subject spaced apart from the surface of the instrument using the one or more output signals.

主权项

1. An instrument for measuring near point of convergence (NPC) and/or near point of accommodation (NPA), the instrument comprising:
an instrument housing having a front face and a rear face disposed opposite to the front face; at least one visual target disposed on or in the front face of the instrument housing, the at least one visual target viewable by a subject that is facing the front face of the instrument housing; a distance measuring device disposed on or in the front face of the instrument housing, the distance measuring device configured to emit one or more output signals that are representative of a distance between a surface of the instrument and a body surface of the subject spaced apart from the surface of the instrument; a processing device disposed within the instrument housing, the processing device operatively coupled to the distance measuring device, the processing device configured to receive the one or more output signals that are output by the distance measuring device and to calculate the distance between the surface of the instrument and the body surface of the subject spaced apart from the surface of the instrument using the one or more output signals; and a visual display device disposed on or in the rear face of the instrument housing, the visual display device operatively coupled to the processing device, and the visual display device configured to display the distance calculated by the processing device to a user of the instrument that is facing the rear face of the instrument housing.