Structure: composed of optical imaging system, control system and display. Working principle: AUTO REF/KERATOMETER is to use infrared fundus reflex phase method, by launching a specific wavelength beam of infrared light, through the examiner cornea, lens and so on, finally projected onto the retina eyeball, then reflected back to the corresponding optical system, absorb the image by image sensor, after image processing, signal processing, calculate the ball lens diopter, axial column lens dioptre, column mirror, An instrument used to determine the refractive state of the human eye. AUTO REF/KERATOMETER can move in X axis, Y axis and Z axis at the same time, with 3D automatic eye tracking function.
An electrically-powered, ophthalmic device designed to be used by a healthcare professional to objectively measure the refractive error of the eye (the inaccuracies of focusing light upon the retina) by measuring how light is changed when it enters the patient's eye(s). The device emits light into the eye and detects the light reflection which is measured for sphere, cylinder, axis and/or high order aberration measurements, typically measured in dioptres (the reciprocal of the focal length of the lens expressed in metres). Also known as an aberrometer, the device uses this information to automatically calculate the lens prescription needed to correct the patient's vision.