| Analisadores | KR-9000PW |
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KR-9000PW
A Brand New Refractíon Meas
Simultaneous measurement of Wavefront Aberrations and Corneal Topography
The KR-9000PW has three optical systems: Wavefront, Plácido Ring, and Refractometer. As shown in the figure, since ali optical systems are simultaneously raeasured on the same axle, the KR-9000PW doesrit have any time lag during each measurement.
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| Diferenciais |
ÍThe new Topcon KR-9000PW can provide a quantitative analysis of wavefront aberration including Irregular Astigmatism (High Order Aberration). It can also acquire reliable, accurate information to estimate the best corrected visual acuity, and can be used for pre-operative screening and post-operative follow up.
The KR-9000PW is an innovative product which incorporates a Hartmann-Shack Wavefront Sensor and a Piacido Ring, to provide accurate measurements of both refractive aberration and corneal aberration. The KR-9000PW can measure slight refractive disorders extremely accurately and with full dimensionality, which conventional Auto Refractometers and Auto Kerato Refractometers cannot do.The KR-9000PW is ideal for refractive surgery (LASIK etc...), for planning or pre/post-operation comparison, or can be used to provide essential data for ali ophthalmologic operations, such as a cataract, the retinal diseases, and diseases on vitreous body.
The KR-9000PW combines the most reliable wavefront measurement principies (Hartmann-Shack wave-front sensor and Zernike Polynomials) with our integrated Rotary Prism technology to deliver objective data that is unmatched in accuracy and reliability. The instrument provides sphere, cylinder and axis measurements as well as indicating spherical aberrations, coma and other high order aberrations of the eye. With a measuring range of -25 to +22 diopters of sphere, the new KR-9000PW is a practical wavefront tool for use in the everyday practice. |
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| Clinicai case examples and analysis |
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 CASE 1 - In the corneal axial power map, the power at the central área is uniform and the peripheral área is weak. That means the patient has a normal córnea with a slight ATR astigmatism.
In the corneal higher-order aberration map, the wavefront is relalively plain and there is no corneal irregular astigmatism. The central part of the total aberration map shows a delay of the wavefront. In this case, the patient has myopia and the uncorrected visual acuity is insuffícient. Note that the shape of the refractive higher-order aberration map is quite different from that of the corneal higher-order aberration map. The central área of the map shows a delay of the wavefront, which is surrounded by an área showing an advance of the wavefront. When observing a Lenticular irregular astigmatism due to lenticonus, the shape of the map is more similar to the map of the spherical-like astigmatism. |
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 CASE 2 - The shape of the Corneal Axial Map basically shows a normal condition of the córnea.
In the corneal higher-order aberration map, the wavefront is relatively plain and we find no corneal irregular astigmatism. In the central área of the total aberration map there is a clear delay of the wavefront. Tn this case, the patient has myopia and the the uncorrected visual acuity is insufficient. The shape of the refractive higher-order aberration map is quite different from that of the corneal higher-order aberration map. The central área of the map shows a delay of the wavefront, and it is surrounded by an área showing an advancement of the wavefront.
This demonstrates that when observing a crystalline lens irregular astigmatism by lens nucleus, the shape of the map quite similar to lhe map of sphcrical-like astigmatism. |
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 CASE 3 - The shape of the Corneal Axial Map basically shows a normal condition of the córnea.
In the corneal higher-order aberration map, the wavefront is relatively plain and we find no corneal irregular astigmatism. In the central área of the total aberration map there is a clear delay of the wavefront. Tn this case, the patient has myopia and the the uncorrected visual acuity is insufficient. The shape of the refractive higher-order aberration map is quite different from that of the corneal higher-order aberration map. The central área of the map shows a delay of the wavefront, and it is surrounded by an área showing an advancement of the wavefront.
This demonstrates that when observing a crystalline lens irregular astigmatism by lens nucleus, the shape of the map quite similar to lhe map of sphcrical-like astigmatism.
In the corneal axial power map, the power at the central área is uniform and the peripheral área is weak. That means the patient has a normal córnea with a slight ATR astigmatism.
In the corneal higher-order aberration map, the wavefront is relalively plain and there is no corneal irregular astigmatism. The central part of the total aberration map shows a delay of the wavefront. In this case, the patient has myopia and the uncorrected visual acuity is insuffícient. Note that the shape of the refractive higher-order aberration map is quite different from that of the corneal higher-order aberration map. The central área of the map shows a delay of the wavefront, which is surrounded by an área showing an advance of the wavefront. When observing a Lenticular irregular astigmatism due to lenticonus, the shape of the map is more similar to the map of the spherical-like astigmatism. |
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 CASE 4 - The shape of the Corneal Axial Map basically shows a normal condition of the córnea.
In the corneal higher-order aberration map, the wavefront is relatively plain and we find no corneal irregular astigmatism. In the central área of the total aberration map there is a clear delay of the wavefront. Tn this case, the patient has myopia and the the uncorrected visual acuity is insufficient. The shape of the refractive higher-order aberration map is quite different from that of the corneal higher-order aberration map. The central área of the map shows a delay of the wavefront, and it is surrounded by an área showing an advancement of the wavefront.
This demonstrates that when observing a crystalline lens irregular astigmatism by lens nucleus, the shape of the map quite similar to lhe map of sphcrical-like astigmatism. |
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| Especificações técnicas |
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| KR-9000 PW |
Refractive power measurement Measuring range
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Hyperopia : 0 to +22D 0.25D step display (switchable to 0.12D display)
Myopia : 0 to -25D 0.25D step display (switchable to 0.12D step display)
Astigmatism : 0 to 8D(+ or -)
0.25D step display(switchable to 0.12D step display)
Axial angle : 0 to 180"
1" step display (switchable to 5° step display) |
Corneal curvature measurement Measuring range
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Radius oí corneal curvature : 5.00~10.00mm, u.oimtn step aispiay
Corneal refractory power: 67.50-33.75D
0.25D siep display (switchable to 0.12D step display)
(corneal refractive indexai .3375)
Corneal astigmatic power: 0~10D(+ or-)
0.25D step display (switchable to 0.12D step display)
Corneal astigmatic axial angle : Q-180°{r step display) |
Refractive aberration measurement
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Hartmann-Shack wave-froni analyzer
High order aberration : Zernike polynominal up to 6th order or up to 4th order
Aberration display : Total aberration, High order aberration
Measuring range: 0±15D
Measurinq área: 7.0mmá |
| Corneal mapping / Corneal wave-front aberration measurement |
Number of Plácido rings : 11
Number of measurement sampling points : 3,960
Radius of corneal curvature : 5.00-10.OOtnm
Corneal refractory power: 67.50-33.75D(corneal refractive index=1.3375)
Measuring área : <ífO.8mm--<í>9.2mm (radius of corneal curvature=8mm)
Color córnea! mapping display
High order aberration : Zernike polynominal up to 6th order or up to 4th order.
Aberration display : Total aberraíion, High order aberration
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Minimum pupil diameter measurable(REF) |
2.0 |
| Target fixation |
Auto fog system |
| Measurement data display |
TV monitor screen |
| Measurement data recording |
Built-in prinler (Data of 10 measurements of right and left eyes) |
| PD measurement |
5º |
| Externai output terminal |
TV monitor screen |
| Power source/power consumption |
AC 100, 120, 220, 230 and 240V, 50/60HZ, 160VA |
| Operating temperature |
10-40º C |
| Main body travel |
back & forth : 40mm, sides : 86mm, up & down : 30mm |
| Chinrest travel |
60mm(up & down) |
| Weigth |
310(W)x475(D)x500(H)mm |
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