Model of auto refractometer (AR) including the 3D tracking, the measure of accommodation and backlight. The model ARK of auto-refract-keratometer includes the measure of the keratometry, useful to adapt contact lenses.
- Measurement range of spheres from -30D to +25D
- Measurement range of cylinders +/- 12D
- 3D Eye-Tracking and automatic triggering of the measurement
- Optimised jamming to minimise the accommodation
- Confidence index of the reading
- Measurement of both central and peripheral keratometries (ARK-1 model)
- Automatic measurement of pupillary and corneal diameters
- Measurement of the accommodation amplitude
- Measurement of the retro-illumination
Measure of refraction
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.
Measure of keratometry
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.
Le modèle AR(K)-1a intègre également les fonctions de mesure de l’amplitude d’accommodation et de la rétro-illumination.
Transferring the data of the objective refraction to a NIDEK automatic refractor can be performed through a cable network or a NIDEK EyeCare card.
- Reference eye
- Protective cover
- Printing paper roller
- User’s manual
- Power chord
- NIDEK EyeCare card
- RS-232C communication cable
- RJ-45 communication cable
- Printing paper roller
- Chinrest sheet
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The art of Eye Care