MEASURING REFRACTIVE CHARACTERISTICS OF HUMAN EYES

摘要

An apparatus and method for measuring refractive characteristics of human eyes with an objective refraction measuring device for measuring refraction in at least one eye, the objective refraction measuring system (10) having a proximal end and a distal end, the objective refraction measuring system suitable for looking in the proximal end and seeing out the distal end; an open field visual target (50). A viewing lane (20) is provided between the eye (42) and (44) the open field visual target (50), the viewing lane has sufficient length to allow for focusing the eye at infinity and for natural accommodation at true distance targets, such near distances such as reading distances. The objective refraction measuring device can be positioned in the viewing lane to measure the eye while the eye is focused on the open field visual target. In one embodiment the objective refraction measuring device may measure refraction characteristics of an eye continuously, substantially continuously or incrementally during dynamic accommodation or changes of the lighting conditions while providing true distance visual targets with the open field of view through the apparatus. In another embodiment the device objectively measures refraction characteristics of both eyes working together when viewing the open field visual target.