CN100586406C - Transmission type artificial crystal optical aberration hartmann measuring apparatus - Google Patents

Transmission type artificial crystal optical aberration hartmann measuring apparatus Download PDF

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Publication number
CN100586406C
CN100586406C CN200710304512A CN200710304512A CN100586406C CN 100586406 C CN100586406 C CN 100586406C CN 200710304512 A CN200710304512 A CN 200710304512A CN 200710304512 A CN200710304512 A CN 200710304512A CN 100586406 C CN100586406 C CN 100586406C
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artificial crystal
photodetector
light
aberration
intraocular lenses
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CN200710304512A
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CN101278874A (en
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戴云
饶学军
王海英
张雨东
王宁利
熊瑛
万修华
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Institute of Optics and Electronics of CAS
Beijing Tongren Hospital
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Institute of Optics and Electronics of CAS
Beijing Tongren Hospital
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Abstract

A transmissive artificial crystal wave aberration Hartman measuring instrument mainly comprises a light source, a beam filtering system, an internal focusing mechanism, a pore opening size segmentation element, a photodetector and a computer. A Hartman wave-front sensor is composed of the pore opening size segmentation element and the photodetector. Lights given off by the light source are filtered by the beam filtering system and are emitted after being collimated into parallel lights and pass through an artificial crystal to be measured. Carrying artificial crystal wave aberration information, transmission light waves enter the internal focusing mechanism. The diopter of the artificial crystal is compensated by the internal focusing device. The compensated light waves are segmented and sampled by the pore opening size segmentation element and are focused on the photodetector to form light spot arrays. Light spot data is collected and sent to the computer to obtain the total aberration of the artificial crystal to be measured after being processed. The transmissive artificial crystal wave aberration Hartman measuring instrument has the advantage of simple and stable structure, which can provide a convenient, fast and reliable detection for the ophthalmology clinical artificial crystal transplantation and processing and the detection of artificial crystals for personalized human eye aberrations correcting.

Description

A kind of transmission type artificial crystal optical aberration hartmann measuring apparatus
Technical field
The present invention relates to a kind of transmission type artificial crystal optical aberration hartmann measuring apparatus, the special equipment when it is clinical ophthalmology transplanting artificial intraocular lenses also is the crystalline a kind of high precision apparatus of the productive manpower simultaneously.
Background technology
At present, the artificial intraocular lenses has been widely used in the optical correction behind height ametropia and the cataract operation, but mostly can only correct human eye low order aberration such as out of focus, astigmatism etc.The research surface, not only there is low order aberration in the opthalmic optics system, also there are higher order aberratons such as coma, spherical aberration etc., correcting human eye low order and higher order aberratons simultaneously can obtain better visual quality and improve (" Visual Performance after correcting the monochromatic and chromatic aberrations of theeye ", Geun-Young Yoon and David R.Williams, J.Opt.Soc.Am.A/Vol.19, No.2/February).Therefore, the artificial intraocular lenses of single rectification human eye low order aberration can not satisfy the demand of people to the human eye correction of refractive errors, and the artificial intraocular lenses that can correct the human eye higher order aberratons becomes new research focus and developing tendency in future.The basis of realizing this goal is human eye correction for higher order aberrations artificial intraocular lenses's making, and artificial intraocular lenses's detection is the basis that makes.
Because human eye correction for higher order aberrations artificial intraocular lenses not only corrects the human eye low order aberration, also to correct the human eye higher order aberratons simultaneously, simple focal power detects the detection requirement that can not satisfy the correction for higher order aberrations artificial intraocular lenses, need comprehensively and objectively measure each rank aberration of artificial intraocular lenses (low order and high-order).At present, human eye correction for higher order aberrations artificial intraocular lenses still is a kind of artificial intraocular lenses of novelty, supporting technology is also among active research, the present invention proposes to adopt Hartmann's Wavefront detecting technology to realize artificial intraocular lenses's aberration measurement, it not only can measure artificial intraocular lenses's low order aberration, can also measure artificial intraocular lenses's higher order aberratons.
Hartmann wave front sensor is a kind of simple in structure, stable Wavefront sensor, and it is cut apart sampling with incident beam and focuses on the photodetector, by PHASE DISTRIBUTION before the date processing acquisition incident light wave.At present, Hartmann wave front sensor mainly contains based on microlens array (" application of Hartmann wave front sensor ", Jiang Wenhan, bright great, Yang Ze equality, quantum electronics newspaper, 15 volumes, 2 phase 228-235 pages or leaves, 1998) and based on microprism array (" Hartmann-Shack Wavefront Sensor Basedon a Micro-Grating Array ", Haiying Wang, Haifeng Duan, Changtao Wang, Yudong Zhang, SPIE, Vol.6018,2005) two kinds of forms.Hartmann's Wavefront detecting technology has been widely used in numerous areas such as human eye aberration measurement, beam quality diagnosis, optical element detection.But Hartmann wave front sensor is applied to artificial intraocular lenses's aberration measurement and still belongs to blank, and the present invention proposes at this situation just.
Summary of the invention
Technology provided by the present invention is dealt with problems and is: overcome the deficiencies in the prior art, provide a kind of versatility good, can carry out the transmission type artificial crystal optical aberration hartmann measuring apparatus of aberration measurement to any dioptric artificial intraocular lenses, for the clinical ophthalmology artificial intraocular lenses transplants and artificial intraocular lenses's processing and detection etc. are provided convenience, quick and reliable detection.
Technical solution of the present invention is: transmission type artificial crystal optical aberration hartmann measuring apparatus mainly comprises: light source, light beam filtering system, interior focusing device, aperture segmentation element, photodetector and computer, and wherein aperture segmentation element, photodetector constitute Hartmann wave front sensor; The light that sends by light source outgoing after the filtering of light beam filtering system and collimation are directional light, pass artificial intraocular lenses to be measured, transmitted light wave is carried artificial intraocular lenses's aberration information and is entered the interior focusing device, is that out of focus compensates by the interior focusing device to artificial intraocular lenses's diopter, light wave after the compensation is sampled by the aperture segmentation element divisions and is focused on and forms spot array on the photodetector, photodetector will be gathered the hot spot data and send into computer, machine is handled the aberration size that obtains incident light wave this moment as calculated, and the focusing amount size of comprehensive interior focusing device recording obtains the total aberration of artificial intraocular lenses to be measured.
Described interior focusing device is made of the Beam matching telescope that the lens or the reflecting mirror of two different focal constitutes.
Described aperture segmentation element is a microlens array, or microprism array; When the aperture segmentation element was microlens array, photoelectric detector was positioned on the microlens array focal plane; When being microprism array, also be added with fourier transform lens or imaging len in the microprism array back, fourier transform lens or imaging len are near microprism array, and photoelectric detector is positioned on the focal plane of fourier transform lens or imaging len.
Described photodetector both can be the imaging camera, also can be the position sensor array.
Principle of the present invention is: the light that light source sends is directional light through collimation, pass artificial intraocular lenses to be measured, transmitted light wave is carried artificial intraocular lenses's aberration information and is entered the interior focusing Hartmann wave front sensor, by the interior focusing device artificial intraocular lenses's diopter is compensated, and record focusing amount size, light wave is collimated after by the interior focusing device to be directional light, the via hole diameter cutting element is cut apart sampling and is focused on the photodetector, gather the hot spot data and send into computer, the treated incident light wave aberration size that obtains, the focusing amount size of comprehensive interior focusing device recording obtains the total aberration of artificial intraocular lenses to be measured.
Described aperture segmentation element can be a microlens array, also can be that microprism array or other have the aperture segmentation element of identical function.Described photodetector both can be the imaging camera, also can be the position sensor array.
The present invention compared with prior art has following advantage:
(1) interior focusing device of the present invention compensates artificial intraocular lenses's diopter, out of focus that will be bigger is separated measurement with all the other aberrations, reduced artificial intraocular lenses's aberration measurement to the requirement of Hartmann's dynamic range, the instrument versatility is good, can carry out aberration measurement to any dioptric artificial intraocular lenses, for the clinical ophthalmology artificial intraocular lenses transplants and artificial intraocular lenses's processing and detection etc. are provided convenience, quick and reliable detection.
(2) the present invention adopts the Hartmann wave front sensor with interior focusing device to measure artificial intraocular lenses's aberration, with respect to interferometer aberration detection method, low to environmental requirement, realize that easily small-bore (about intraocular lens optic district 5mm) complicated higher order aberratons detects, and has simple in structure and stable advantage.
(3) interior focusing device of the present invention compensates artificial intraocular lenses's diopter, and compensation dosage equals artificial intraocular lenses's focal power size, therefore can obtain the dioptric size of crystal when obtaining the comprehensive aberration of artificial intraocular lenses, and versatility is good.
Description of drawings
Fig. 1 is the artificial intraocular lenses's aberration measurement schematic diagram that the present invention is based on the lenticule Hartmann;
Fig. 2 among the present invention based on the Hartmann wave front sensor structure and the operation principle sketch map of microlens array;
Fig. 3 is the artificial intraocular lenses's aberration measurement schematic diagram that the present invention is based on the microprism Hartmann;
Fig. 4 among the present invention based on the Hartmann wave front sensor structure and the operation principle sketch map of microprism array.
The specific embodiment
As shown in Figure 1, for the aperture segmentation element among the present invention is artificial intraocular lenses's aberration measurement schematic diagram of microlens array, it comprises light source 1, light beam filtering system, interior focusing device, aperture segmentation element 61, photodetector 62 and computer 7, aperture segmentation element wherein, be that microlens array 61 and photodetector 62 constitute Hartmann wave front sensor, the light beam filtering system is made of pin hole 2 and collimating mirror 3, the Beam matching telescope that interior focusing device 5 is made of the lens or the reflecting mirror of two different focal.The light that light source 1 sends, through pin hole 2 filtering, by collimating mirror 3 collimations is parallel light emergence, pass artificial intraocular lenses 4 to be measured, transmitted light wave is carried artificial intraocular lenses's aberration information and is entered the interior focusing Hartmann wave front sensor, by dotted portion among mobile Fig. 1 artificial intraocular lenses's diopter (being out of focus) is compensated, and record focusing amount size.It is directional light that light wave sees through focussing mechanism 5 backs collimated, cut apart sampling and focused on the photodetector 62 through microlens array 61 and formed spot array, gather the hot spot data and send into computer 7, the treated aberration size that obtains incident light wave this moment, the focusing amount size of comprehensive interior focusing device recording obtains the total aberration of artificial intraocular lenses to be measured.
As shown in Figure 2, mainly be made up of microlens array 61 and photoelectric detector 62 based on the Hartmann wave front sensor of microlens array, wherein photoelectric detector 62 is positioned on the focal plane of microlens array 61.
Operation principle based on the Hartmann wave front sensor of microlens array is: incident beam forms a spot array on its focal plane behind microlens array 61, the overall optical beam orifice is evenly cut apart.The spot array of preserving standard flat ripple incident generation is as nominal data.When having the wavefront incident of certain aberration, the local wavefront on each lenticule tilts to cause that the facula position on the microlens array focal plane is offset.
The hot spot signal that photoelectric detector 62 receives can be handled by computer, adopts centroid algorithm: the position (x that is 1. calculated hot spot by formula i, y i), the corrugated control information of detection full aperture:
x i = Σ m = 1 M Σ n = 1 N x nm I nm Σ m = 1 M Σ n = 1 N I nm , y i = Σ m = 1 M Σ n = 1 N y nm I nm Σ m = 1 M Σ n = 1 N I nm ①
In the formula, m=1～M, n=1～N are that sub-aperture is mapped to pixel region corresponding on the photoelectric detector 62, I NmBe (n, the m) signal received of individual pixel-by-pixel basis, x on the photoelectric detector 62 Nm, y NmBe respectively (n, m) the x coordinate of individual pixel and y coordinate.
2. calculate the wavefront slope g of incident wavefront again according to formula Xi, g Yi:
g xi = Δx λf = x i - x o λf , g yi = Δy λf = y i - y o λf ②
In the formula, (x 0, y 0) demarcate the spot center reference position that Hartmann sensor obtains for the standard flat ripple; During Hartmann sensor probing wave front-distortion, spot center is displaced to (x i, y i), finish the detection of Hartmann wave front sensor to signal.
As shown in Figure 3, for the aperture segmentation element among the present invention be artificial intraocular lenses's aberration measurement schematic diagram of microprism array.It comprises light source 1, light beam filtering system, interior focusing device, aperture segmentation element, be microprism array 61 ', fourier transform lens or imaging len 63, photodetector 62 and computer 7, wherein microprism array 61 ', fourier transform lens or imaging len 63 and photodetector 62 constitute Hartmann wave front sensor, the light beam filtering system is made of pin hole 2 and collimating mirror 3, the Beam matching telescope that interior focusing device 5 is made of the lens or the reflecting mirror of two different focal.The light that light source 1 sends, through pin hole 2 filtering, by collimating mirror 3 collimations is parallel light emergence, pass artificial intraocular lenses 4 to be measured, transmitted light wave is carried artificial intraocular lenses's aberration information and is entered the interior focusing Hartmann wave front sensor, by dotted portion among mobile Fig. 1 artificial intraocular lenses's diopter (being out of focus) is compensated, and record focusing amount size.It is directional light that light wave sees through focussing mechanism 5 backs collimated, through microprism array 61 ', fourier transform lens or imaging len 63 backs are cut apart sampling and focused on the photodetector 62 forms spot array, gather the hot spot data and send into computer 7, the treated aberration size that obtains incident light wave this moment, the focusing amount size of comprehensive interior focusing device recording obtains the total aberration of artificial intraocular lenses to be measured.
As shown in Figure 4, Hartmann wave front sensor based on microprism array mainly is made up of microprism array 61 ', fourier transform lens or imaging len 63 and the photoelectric detector 62 of sawtooth shaped phase optical grating construction, wherein fourier transform lens or imaging len 63 are near microprism array 61 ', and photoelectric detector 62 is positioned on the focal plane of fourier transform lens or imaging len 63.
Operation principle based on the Hartmann wave front sensor of microprism array is: incident beam is behind microprism array 61 ', the light beam in each sub-aperture has produced the respective phase variation respectively, by being close to fourier transform lens or imaging len 63 imagings thereafter, survey its light distribution by the photoelectric detector 62 that is positioned on fourier transform lens or imaging len 63 focal planes, this light distribution is comprising the phase information that two-dimentional sawtooth shaped phase grating array is produced, the phase place that each sub-aperture produced changes different, thereby on fourier transform lens (or imaging len) focal plane, forming a spot array, the overall optical beam orifice is evenly cut apart.The spot array that the incident of standard flat ripple produces will be saved and be used as nominal data.When having the wavefront incident of certain aberration, each local dip plane wave produces new additive phase to two-dimentional sawtooth shaped phase grating in its sub-aperture, and this phase place changes in the facula position skew that will be reflected to fourier transform lens or imaging len focal plane.
The hot spot signal that photoelectric detector 62 receives can be handled by computer, adopts centroid algorithm: the position (x that is 1. calculated hot spot by formula i, y i), the corrugated control information of detection full aperture:
x i = Σ m = 1 M Σ n = 1 N x nm I nm Σ m = 1 M Σ n = 1 N I nm , y i = Σ m = 1 M Σ n = 1 N y nm I nm Σ m = 1 M Σ n = 1 N I nm ①
In the formula, m=1～M, n=1～N are that sub-aperture is mapped to pixel region corresponding on the photoelectric detector 62, I NmBe (n, the m) signal received of individual pixel-by-pixel basis, x on the photoelectric detector 62 Nm, y NmBe respectively (n, m) the x coordinate of individual pixel and y coordinate.
2. calculate the wavefront slope g of incident wavefront again according to formula Xi, g Yi:
g xi = Δx λf = x i - x o λf , g yi = Δy λf = y i - y o λf ②
In the formula, (x 0, y 0) demarcate the spot center reference position that Hartmann sensor obtains for the standard flat ripple; During Hartmann sensor probing wave front-distortion, spot center is displaced to (x i, y i), finish the detection of Hartmann wave front sensor to signal.

Claims (6)

1, transmission type artificial crystal optical aberration hartmann measuring apparatus, it is characterized in that mainly comprising: light source, light beam filtering system, interior focusing device, aperture segmentation element, photodetector and computer, wherein aperture segmentation element, photodetector constitute Hartmann wave front sensor; The light that sends by light source outgoing after the filtering of light beam filtering system and collimation are directional light, pass artificial intraocular lenses to be measured, transmitted light wave is carried artificial intraocular lenses's aberration information and is entered the interior focusing device, is that out of focus compensates by the interior focusing device to artificial intraocular lenses's diopter, light wave after the compensation is sampled by the aperture segmentation element divisions and is focused on and forms spot array on the photodetector, photodetector will be gathered the hot spot data and send into computer, machine is handled the aberration size that obtains incident light wave this moment as calculated, and the focusing amount size of comprehensive interior focusing device recording obtains the total aberration of artificial intraocular lenses to be measured.
2, transmission type artificial crystal optical aberration hartmann measuring apparatus according to claim 1 is characterized in that: described interior focusing device is made of the Beam matching telescope that the lens or the reflecting mirror of two different focal constitutes.
3, transmission type artificial crystal optical aberration hartmann measuring apparatus according to claim 1 is characterized in that: described aperture segmentation element is a microlens array, or microprism array; When the aperture segmentation element was microlens array, photoelectric detector was positioned on the microlens array focal plane; When being microprism array, also be added with fourier transform lens or imaging len in the microprism array back, fourier transform lens or imaging len are near microprism array, and photoelectric detector is positioned on the focal plane of fourier transform lens or imaging len.
4, transmission type artificial crystal optical aberration hartmann measuring apparatus according to claim 1 is characterized in that: described photodetector is the imaging camera, or the position sensor array.
5, transmission type artificial crystal optical aberration hartmann measuring apparatus according to claim 1 is characterized in that: described light beam filtering system is made of pin hole and collimating mirror, and light beam is parallel light emergence through pin hole filtering by the collimating mirror collimation.
6, transmission type artificial crystal optical aberration hartmann measuring apparatus according to claim 1 is characterized in that: described light source is semiconductor laser or superradiance semiconductor device.
CN200710304512A 2007-12-28 2007-12-28 Transmission type artificial crystal optical aberration hartmann measuring apparatus Expired - Fee Related CN100586406C (en)

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CN102824159B (en) * 2012-09-13 2014-08-27 深圳市斯尔顿科技有限公司 Automatic diopter adjustment system, equipment and method for fundus OCT (Optical Coherence Tomography)
CN102937512B (en) * 2012-10-26 2015-06-24 中国人民解放军国防科学技术大学 Spectroscope aberration measuring system based on double hartmenn-shack detectors
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