Auto Refractometer / Keratometer: Hartman Technology ARK-7800A The Auto Refracto-Keratometer is one high precision instrument of objective measuring the patient’s eyes with unique optical system inside and accurate imaging analyzing and processing in Hartman technology. It’s mainly used to measure the patient’s diopter, including sphere power, cylinder power, optical axis, pupil distance and corneal curvature, to provide reference datas for eyes’ treating and eyeglasses choice. The measurement result can be displayed on screen or printed out on paper, and can also be transferred to auto phoroptor (fit to RS232 interface)). If the auto phoroptor can output data, this Auto Refracto-Keratometer can directly print out the measured optometry data The serial Auto Refracto-Keratometer consist of optical system, mechanical transmission system, COMS image sensing system, microcomputer control system, and printer etc., are the professional instruments of providing reference data for glasses and eye diagnosis and treatment. According to measurement function, it’s divided into refractive parameters measurement and refractive parameters measurement/corneal curvature measurement. According to measurement mode, it’s divided into manual measurement and automatic measurement. Differences Auto Refracto-Keratometer Auto Refractometer Production Edit and embed software of refractometer and keratometer, use objective standard tool、corneal curvature standard device to adjust and calibrate Edit and embed software of refractometer only, use objective standard device to adjust and calibrate mode REF 、 KER 、 and REF\KER three measurement modes optional Default REF measurement mode Imaging principle design A standard ring is projected onto the patient’s cornea with a group of 760nm infrared light, the corneal astigmatism and axis are calculated according to the different curvature parameters in each direction of the corneal reflex ring. Use 850nm infrared light to project the Hartmann lenslet array into the fundus of the patient’s eyes, and separately calculate the parameters such as sphere, cylinder and axis according to the fundus reflection array. Use 850nm infrared light to project the Hartmann lenslet array into the fundus of the patient’s eyes, and separately calculate the parameters such as sphere , cylinder and axis according to the fundus reflection array Purpose The instrument can be used to measure the curvature of the meridians of the center area about 3mm on the anterior corneal surface, that is the radius of curvature and curvature, so as to determine whether or not the cornea has astigmatism, astigmatism power and axial direction. It can also be used to measure the power of the patient, such as sphere, cylinder and axis. used to measure the power of the patient, such as sphere, cylinder and axis. Measuremet modle Manual measurement and automatic measurement. Aligning the measurement target at the corneal vertex, manual or automatic focus to clear state, the instrument will automatically measure the corneal curvature power. Use the same measuring method to automatically measure the powers of sphere, cylinder and axis. Manual measurement and automatic measurement. Aligning the measurement target at the corneal vertex, manual or automatic focus to clear state, the instrument will automatically measure the powers of sphere, cylinder and axis. Patient Non-contact measurement, the patient opens his eyes and looks right ahead, and move the target to complete the measurement(note the replacement of the chinrest paper and the forehead rubber cleaning ) Non-contact measurement, the patient opens his eyes and looks right ahead, and move the target to complete the measurement(note the replacement of the chinrest paper and the forehead rubber cleaning )