1. When starting the focimeter, it usually performs a self check. The machine will check if the optical path is unobstructed and free from foreign objects. If the screen displays an error or the system cannot be accessed normally after booting up, first check whether the lens cover of the measuring lens is open. The above error message may also occur when the lens is first placed on the lens holder and then turned on. 2. When the optical path of the power meter is unobstructed, it is found that the power meter cannot return to zero after entering the ... Read More

Pupil distance meter is a measuring instrument used in the process of optometry and glasses matching to measure the distance between the two pupils of the human eye. The measurement principle of a pupil distance meter is that the visual target illuminated by a light source is imaged by an optical system at a specific working distance in front of the patient’s eyes. When the patient looks at the visual target, the visual axes of their left and right eyes intersect at this specific working distance. At this point, the light forms a reflective spot on the surface of the ... Read More