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ShaH-IOL
INTRAOCULAR LENS TESTER |
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ShaH-IOL
tester provides fast and accurate quality control of intraocular
lenses (IOL) with a spherical, aspheric, toric, or complex
surface. Measurement and wavefront analysis allow receiving in a
few seconds the complete information on the optical quality of
an IOL: focal power, wavefront aberration map (up to 66 Zernike
polynomials), PSF (point spread function), MTF (modulation
transfer function), EFL (effective focal length). By means of
ShaH-IOL, it
is possible to analyze both monofocal and multifocal lenses,
either in dry (in air) or wet (in situ) conditions.
Intraocular lenses are being implanted into human eyes to
replace crystalline lenses in patients suffering from defects of
vision. Implantation of an IOL should provide the patient with
accurate vision of surrounding objects. Quality control is a
crucial point for choosing the individual IOL perfectly matching
the peculiarities of patient's vision system. |
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TECHNICAL SPECIFICATION *
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IOL measured aperture
(diameter) |
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up to 4.5 mm |
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Power map lateral
resolution
(for 4.5 aperture) |
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25 μm |
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Number of lenslets |
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up to 166×166 |
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Power absolute
accuracy |
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0.1 ... 0.3% |
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Power resolution |
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0.01 D |
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Repeatability RMS |
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1 nm |
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Absolute measurement
accuracy RMS |
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λ/50 |
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Focus position
accuracy |
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1.5 μm |
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Power range
(direct measurements) |
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-10 D … +10 D |
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Defocus compensator |
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-5 D ... +30 D |
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MTF absolute accuracy |
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2% |
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Acquisition time |
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< 0.1 s |
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Processing time |
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< 0.5 s |
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Working wavelength |
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546±10
nm |
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Cell alignment |
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4 axes (tip-tilt, X,Y) |
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In situ measurement
cell |
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ISO 11979 compatible |
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Thermal stabilization
(optional) |
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36±10C |
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Interface |
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Ethernet, 2 channels
(GiG and 10/100) required |
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Software Functions |
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Absolute or
relative measurement
Subtraction of background illumination
EFL measurement and display
MTF and PSF, Diopter power and power map
Lower and higher lens aberration (Zernike and Seidel)
Real time display of: 2D and 3D wavefront
Peak-to-Valley and RMS Values
Intensity, Slope data, Raw camera image
Lower and higher lens aberration coefficients
Synthesized interferogramm
Real time correction of sample misalignment (tilt and
defocus, astigmatism)
Available units: μm, nm or λ
Frame rate up to 20 Hz |
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Image sensor |
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Kodak KAI-2020 CCD
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Dimensions (LxHxW)
w/o mount |
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300×450×300
mm |
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The tester may be equipped with a temperature stabilization
unit (35±1
ºC), if requested by the customer.
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