CN2683020Y - Human eyes aberration Hartmann measuring apparatus with rotating beacon mechanism - Google Patents
Human eyes aberration Hartmann measuring apparatus with rotating beacon mechanism Download PDFInfo
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- CN2683020Y CN2683020Y CN 200320104746 CN200320104746U CN2683020Y CN 2683020 Y CN2683020 Y CN 2683020Y CN 200320104746 CN200320104746 CN 200320104746 CN 200320104746 U CN200320104746 U CN 200320104746U CN 2683020 Y CN2683020 Y CN 2683020Y
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Abstract
The utility model discloses a human eye aberration Hartmann measuring apparatus with a rotating beacon mechanism, which uses a Hartmann wavefront sensor to measure the wave aberration of human eyes. A diaphragm rotating around an optical axis of an instrument is arranged in a beacon device. The diaphragm is provided with an off-axis pore, and rotates around the optical axis of the instrument. A beacon plays the uniform function through a plurality of different positions of the pupile of the tested human's eyes, and influence on the quality of beacon imaging of the tested human's eyeground is reduced when a beacon beam passes through some pupillary regions with big human eye aberration; at the same time, nonhomogeneity of Hartmann diaphragm lattice lighting intensity can be efficaciously improved, and thereby, the measurement precision and stability of the apparatus can be improved.
Description
This utility model belongs to armarium and makes the field.
Existing vision checkout equipment is that rudimentary aberrations such as the out of focus of human eye aberration and astigmatism are measured, and in view of the above people's eye system is corrected.The cornea revision of external coat and intraocular lens's replacement etc. also are based on rudimentary aberration measurement data to carry out, thereby the improvement of vision is limited to.Yet according to amphiblestroid structure, the vision of human eye can be far above practical situation, and the vision of human eye can be up to more than 3.0, and this is because the influence of human eye out of focus, astigmatism and other more than 30 kinds of senior aberration.The measurement of human eye senior aberration is the development trend that detects of ophthalmology in the world, now just be devoted to formulate the human eyesight of measuring based on the human eye senior aberration and measuring new international standard, this means that new human eye aberration is measured and based on eye cornea anaplasty and the intraocular lens's replacement and the individualized contact lenses design of human eye senior aberration data with make the feature that will become optics of the eye of new generation and external coat.
Aberration of human eye measurement in recent years and super-resolution retina image-forming technology have obtained new development, and this is because refraction surgery evaluation optical quality and rectification video difference reach the new needs of diffraction limit.Modern human eye laser cornea operations and intraocular lens's implantation surgery and individualized contact lenses design and manufacturing all need to surmount the knowledge of the optics of the eye system of traditional focal power notion based on the imaging characteristic of ripple residual quantity level, and for obtaining the data of optimal imaging operation and design personalized contact lens.
Measure working in the nineties of aberration of human eye with Hartmann wave front sensor and carry out as far back as Ruprecht-Karls-Universitat Heidelberg, comparatively systematic research has been carried out at visual science center in University of Rochester's afterwards.The wave aberration that early stage work mainly is based on zernike coefficient measure and various wave aberration to the influence of vision, developed into afterwards in glances aberration measurement system and added adaptive optical technique, obtain amphiblestroid high-resolution imaging.Along with carrying out of this research work, it is found that the measurement of human eye senior aberration and correct and eye surgery will have very attracting future based on the optometry of this measurement.The relevant company of the U.S. has developed the glances aberration measurement equipment based on laser beam trace technology, and wavefront company just is complementary glances difference measurements instrument and cornea anaplasty.Domestic Chinese Academy of Sciences photoelectric technology institute has been carried out the development of human eyesight and aberration measurement instrument with its Hartmann wave front sensor of having succeeded in developing, has formed model machine, treats that clinic trial examination will come into operation after qualified, becomes vision measuring instrument of new generation.
Hartmann wave front sensor mainly is made up of a microlens array and CCD (photoelectric coupled device) detector, microlens array be placed on the conjugated plane of emergent pupil on, detector is to retinal reflex and through sampling before the light wave after the eye optical system, and each lens unit is selected the part of wavefront and form a point on the focal plane.For aberrationless eyes, the wavefront of reproduction is that picture point has a spatial distribution identical with microlens array uniformly; Under the situation that has aberration to exist, picture point is equipped with one with respect to reference bit and moves.Can be by measuring slope that picture point moves in the hope of corresponding eyes wave aberration and its zernike coefficient, thus the characteristic of human eye aberration provided.
Since in the instrument Beacon Point be by semiconductor laser (LD) after a branch of small-bore directional light behind the collimating optical system is by observed human eye pupil at the bottom of human eye the film formed bright spot of view, therefore human eye aberration has a direct impact the shape and the size of optical fundus Beacon Point, the aberration difference in the human eye pupil of diverse location.For overcoming this shortcoming, prior art has adopted beacon beam annular incident and eccentric orfice to go into shooting method and has been solved, but beacon beam is excessive by pupil region simultaneously in the annular beacon approach, so human eye aberration is bigger to the influence of Beacon Point, has under the bigger scattered-light situation especially obvious at human eye.Each beacon beam of measuring is only by a certain fixed area in the pupil in eccentric beacon approach, for different observed human eyes or same observed human eye, this regional aberration is possible bigger than other regional aberration of pupil, might be little, so the measurement less stable of eccentric beacon approach.
The purpose of this utility model is a kind of rotary signal of research mechanism, to improve the certainty of measurement and the stability of instrument.
The purpose of this utility model is to realize by following method.
Human eye aberration Hartmann measuring instrument with rotary signal mechanism, measure aberration of human eye with Hartmann wave front sensor, mainly form Hartmann wave front sensor by a microlens array and CCD photoelectric coupled device detector, this microlens array be placed on the conjugated plane of emergent pupil on; Collimate, expand the beacon beam colimated light system of bundle by the beacon light source, with beacon beam, rotary signal device, No. 1 reflecting mirror, No. 2 spectroscopes, focusing system, single wavelength reflecting mirror (9) and bore matching system constitute the main optical path system, emergent light enters the Hartmann, and the Hartmann can calculate the video signal input of CCD output the aberration computer of measured human eye.Have one around instrument optical axis rotary diaphragm in beacon apparatus, this diaphragm has this diaphragm of off-axis aperture and has the off-axis aperture, and this off-axis aperture rotates around the instrument optical axis in each human eye aberration Measuring Time.
After adopting mechanism as above, beacon beam adopts paraxonic rotation incident mode, because rotary signal (40ms) in Measuring Time, beacon incides on the retina by a plurality of diverse locations of observed human eye pupil, can play the smoothing effect to laser speckle, thereby effectively reduced the influence of laser speckle, improved the certainty of measurement and the stability of instrument measuring.
Description of drawings is as follows:
Fig. 1 is this utility model human eye aberration Hartmann measuring instrument index path.
Fig. 2 is the structure chart of this utility model rotary signal mechanism.
Fig. 3 eccentric orfice beacon structural scheme of mechanism
Below in conjunction with accompanying drawing this mechanism is described in further detail.
As depicted in figs. 1 and 2,1: measured human eye 2: near-infrared luminous diode 3:1 spectroscope 4: pupil image-forming objective lens 5: small ccd 6: preceding group of focusing object lens 7: back group focusing object lens 8:2 spectroscope 9: single wavelength reflecting mirror 10: bore matching system 11:1 reflecting mirror 12: rotary signal device 13: beacon beam colimated light system 14:LD semiconductor laser 15: goal systems 16: computer 17: aperture.
During instrument work, at first carrying out pupil aims at, with near-infrared luminous diode (2) measured human eye (1) pupil that throws light on, reflect by No. 1 spectroscope (3), by pupil image-forming objective lens (4) measured human eye (1) pupil is imaged on small ccd (5) target surface, with the video frequency collection card in the video signal input computer (16) of small ccd (5) output, be presented on the computer display in real time again.Adjust the instrument position, make measured human eye (1) pupil center be positioned at the instrument optical axis center, pass through the target of an infinity in No. 1 spectroscope (3), focusing system, No. 2 spectroscopes (8), single wavelength reflecting mirror (9) the object observing system (15) again with eyes by the measured, adjust focusing system, make target clear at fundus imaging.After finishing aligning, focusing, by the beacon beam that sends with standard light source LD semiconductor laser (14), collimate, expand bundle by beacon beam colimated light system (13), after rotary signal device (12), No. 1 reflecting mirror (11) reflection, again through No. 2 spectroscopes (8) reflection, focusing system, see through No. 1 spectroscope (3) at last, enter measured human eye (1); The beacon beam of measured human eye (1) optical fundus scattering sees through No. 1 spectroscope (3) and focusing system (3), see through No. 2 spectroscopes (8) again, reflect through single wavelength reflecting mirror (9), enter bore matching system (10), emergent light enters the Hartmann, in the video signal input computer (16) of Hartmann with CCD output, calculate the aberration of measured human eye (1) by computer (16).One diaphragm (18) is arranged in the rotary signal device, and this diaphragm has an aperture (19) at the off-axis place, and rotates around the instrument optical axis.With motor (20) the drive off-axis aperture rotation of speed greater than 25Hz, make instrument (40ms) beacon in each human eye aberration Measuring Time pass through a plurality of diverse locations of observed human eye pupil, play average effect, thereby effectively eliminated of the influence of the big pupil region of some human eye aberration to Beacon Point image quality at the bottom of observed human eye, also can effectively improve because laser speckle causes Hartmann's dot matrix light intensity inhomogeneities simultaneously, thereby improve Instrument measuring precision and stability.
Can see in conjunction with Fig. 3, rotary signal mechanism and the annular incident of former beacon beam and eccentric orfice incident mechanism are comparatively speaking, beacon beam is simultaneously by the method for pupil region much larger than rotary signal in annular beacon approach, therefore human eye aberration is to the influence of the Beacon Point method greater than rotary signal, therefore have under the bigger scattered-light situation especially obviously at human eye, the certainty of measurement of annular beacon approach is not as rotary signal.Each beacon beam of measuring is only by a certain fixed area in the pupil in eccentric beacon mechanism, for different observed human eyes or same observed human eye, this regional aberration is possible bigger than other regional aberration of pupil, might be little, therefore the measurement of eccentric beacon approach stability is not as rotary signal.
Embodiment
Adopt the basic technical scheme of this mechanism, in the rotary signal device on the human eye aberration Hartmann measuring instrument that we develop a paraxonic diaphragm is arranged, diaphragm diameter is 18 millimeters, one diameter is set is 1.5 millimeters circular hole departing from 2 millimeters positions, diaphragm center, and by a rotating mechanism make eccentric circular hole in the diaphragm around optical axis with frequency rotation greater than 25Hz.Instrument measuring precision and stability have been improved.
Claims (2)
1, the human eye aberration Hartmann measuring instrument that has rotary signal mechanism, measure aberration of human eye with Hartmann wave front sensor, mainly form by a microlens array and CCD photoelectric coupled device detector, this microlens array be placed on the conjugated plane of human eye emergent pupil face on; Beacon beam enters measured human eye (1) through colimated light system (13), beacon apparatus (12), focusing system (3); The beacon beam of measured human eye optical fundus scattering is through focusing system (3), through single wavelength reflecting mirror (9) 'go'gage matching system (10), enter the Hartmann, the Hartmann is with the video signal input computer (16) of CCD output, calculate the aberration of measured human eye (1), it is characterized in that, have one around instrument optical axis rotary diaphragm in beacon apparatus, this diaphragm has the off-axis aperture.
2, the human eye aberration Hartmann measuring instrument with rotary signal mechanism according to claim 1 is characterized in that, drives eccentric diaphragm rotation and adopts the micro machine of speed greater than 25Hz.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200320104746 CN2683020Y (en) | 2003-12-31 | 2003-12-31 | Human eyes aberration Hartmann measuring apparatus with rotating beacon mechanism |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200320104746 CN2683020Y (en) | 2003-12-31 | 2003-12-31 | Human eyes aberration Hartmann measuring apparatus with rotating beacon mechanism |
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| Publication Number | Publication Date |
|---|---|
| CN2683020Y true CN2683020Y (en) | 2005-03-09 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 200320104746 Expired - Fee Related CN2683020Y (en) | 2003-12-31 | 2003-12-31 | Human eyes aberration Hartmann measuring apparatus with rotating beacon mechanism |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102458227A (en) * | 2009-06-05 | 2012-05-16 | 兴和株式会社 | Ophthalmic photography apparatus |
-
2003
- 2003-12-31 CN CN 200320104746 patent/CN2683020Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102458227A (en) * | 2009-06-05 | 2012-05-16 | 兴和株式会社 | Ophthalmic photography apparatus |
| CN102458227B (en) * | 2009-06-05 | 2014-07-09 | 兴和株式会社 | Ophthalmic photography apparatus |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |