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Today, corneal topographs are essential in ophthalmology consultation units, because of the developments of the refractive surgery of myopia, of adaptations in customised contact lenses, to detect the keratoconus, to analyse the centering and the size of optical zones, and to assess the potential visual acuity. Practically, there are many applications of the corneal topography for ophthalmologists and contactologs.
The NIDEK OPD-Scan III is a corneal topograph integrating the joint measuring of eye global aberrometry, thus making possible a better analysis of visual and optical vision. The challenge is knowing in depth and with accuracy the patients’ vision quality to understand their visual complaints and propose more customised optical and surgical solutions. Aberrometers are non-invasive sophisticated measuring solutions. Their main purpose is evaluating elementary and complex optical defects of the eye.
Complete device for aberrometry and corneal topography measurements. The OPD-Scan III aberrometric station (third generation of the OPD-Scan) is a versatile tool with multiple fields of application.
Measuring the topography is possible thanks to a module made with 33 Placido rings that will reflect on eye surface. The instrument then analyses the digital image obtained when the cornea reflects the light emitted par the Placido rings. This is called the specular reflexion topography.
Then, using the digital calculation, the topograph can produce different detailed maps of the shape of the entire corneal surface. Depending on your working preferences, you can choose between axial topographic maps, instant (or tangent) maps, refractive maps, and elevation maps. A scale can be attached to each map to match a colour and the power (or the radius of curvature).
The aberrometry measure is performed using an exclusive process called “dynamic skiascopy”, resulting from NIDEK expertise in opto-electronics.
The OPD-Scan III makes 2,520 reading over a 9.5 mm optical zone in a fraction of second. As the visual line is close, the result accuracy is unrivalled, thanks to the higher density of the reading points. The series of skiascopies, performed point by point, is used to rebuild a true dioptrical mosaic to finally get the OPD (Optical Path Difference) maps. Selecting the dioptre (vs μm) as measuring unit makes possible carrying out an intuitive reading of aberrometric maps so they appear user-friendlier and easier to understand.
The OPD-Scan III integrates a Corneal navigator module, developed in partnership with Doctors Stephen D. Klyce and Michael K. Smolek. Thanks to a range of keratometric signs and a NIDEK database (neural network), creating a set of eight pathologies is possible. This is a power tool to detect crude and proven keratoconi.
La station aberrométrique OPD-Scan III est un outil complet, polyvalent et convivial, aux champs d’applications multiples.
Powerful cornea analysis tool thanks to the Corneal Navigator and the Corneal Score (optional feature).
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