Model of auto refractometer (AR) including the 3D tracking, the measure of accommodation, the backlight and the subjective measure of the visual acuity. The model ARK of auto-refract-keratometer includes the measure of the keratometry, useful to adapt contact lenses.
The portable model of auto-refractometer AR-1 is used to obtain the objective refraction of the patient.
Coupling the SLD (Super Luminescent Diod) and the high-sensibility CCD sensor enables getting sharp and contrast images, even when the corneal reflection is low. Compared with anterior technologies that used a classical LED lighting, this system is more efficient when the transparency of media is altered, such as in case of cataract.
The device calculates automatically, during the reading of the refraction, the diameters of the pupil and provides a confidence index of the reading.
The auto-refracto-keratometer ARK-1 now integrates the measurement if the keratometry (measurement of the corneal radius curvature). Keratometry is useful to identify the radius curvature of contact lenses.
Keratometry measurements are performed using the double ring target technology that reduces the influence of eyelids. Both 3.3 and 2.4 diameters are measured. Both values are then compared to provide a better understanding of the cornea shape.
The ARK-1 model also includes the measurement of the peripheral keratometry.
The AR(K)-1a model proposes a 3D automatic tracking feature of the device (3D Eye-Tracking). The purpose is automatically performing the focus and making the alignment between the optical line of the device and the gaze axis easier. Once these two readings match, the measurement conditions are optimal and the measurement is automatically triggered.
The ‘Zone Ring’ system has been improved to simultaneously perform the measurement of the central objective refraction and a peripheral measurement. The jamming system, which now integrates the correction of astigmatism, has been redesigned to minimise the consequences of accommodation during the measurement of the refraction.
The AR (K) -1s model also integrates the functions of measurement of the amplitude of accommodation, the back-illumination as well as the rapid control of visual acuity from the measurement of objective refraction.
Transferring the data of the objective refraction to a NIDEK automatic refractor is performed through a cable network or through a NIDEK EyeCare card.
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