Ophthalmic measuring instrument

摘要

An ophthalmic measuring instrument has an instrument frame with suitable clips for mounting the instrument frame to an eyeglass frame on the patient so that spaced eye viewing openings on the instrument frame of the ophthalmic measuring instrument are disposed in alignment with the position of the lenses for the given eyeglass frame to which the instrument frame is attached. Transparent yellow and blue strips having respectively sized widths are adjustably mounted on the instrument frame for movement relative the eye viewing openings and for intersecting movement relative each other. The patient can, in an adjusted position of said yellow and blue strips, view white square targets of predetermined size as a function of the specific working or reading distance at which said targets are being viewed. By centering the instrument frame on the eyeglass frame, and monocularly occluding the patient's respective left eye and right eye, movement of first the yellow strip and then the blue strip, bisecting the patient's visual axes respectively for the left eye and the right eye will enable various measurements to be obtained, such as the exact inter-visual axes distance relative to the center of the eyeglass frames for near vision. The horizontally disposed blue strip can be provided with suitable bracket means for receiving a corrective lens where a patient has a refractive error or presbyopia.