The ARK-A1 utilizes the infrared light retinal reflection phase method. It emits a specific wavelength of infrared light that passes through the cornea, lens, and other parts of the eye, ulti-mately projecting onto the retina. The light is then reflected back into the instrument's optical system. The image is captured by an image sensor and, after image processing and signal pro-cessing, the spherical lens power, cylindrical lens power, and cylindrical axis are calculated. This instrument is used to measure the refractive status of the human eye.
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.