Basic model of auto refractometer (AR) used to measure the objective sphero-cylindrical deviation. 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)-1 model proposes an automatic tracking feature of the device on the vertical axis (Y axis) and an automatic triggering of the measurement once the alignment is correctly performed on the patient’s eye.
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.
Transferring the data of the objective refraction to a NIDEK automatic refractor can be performed through a cable network or a NIDEK EyeCare card.
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