CN2770573Y - Wave front vision diagnostic instrument - Google Patents
Wave front vision diagnostic instrument Download PDFInfo
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- CN2770573Y CN2770573Y CN 200420107135 CN200420107135U CN2770573Y CN 2770573 Y CN2770573 Y CN 2770573Y CN 200420107135 CN200420107135 CN 200420107135 CN 200420107135 U CN200420107135 U CN 200420107135U CN 2770573 Y CN2770573 Y CN 2770573Y
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Abstract
The utility model belongs to the field of medical diagnosis instruments. The wave front vision diagnosis instrument comprises an eye wave front aberration measuring device, a contrast sensitivity function measuring device of a pattern threshold vision system, a connected computer, an output device connected with the computer for outputting vision diagnosis results. The wave front vision diagnosis instrument can provide ten stages of aberration rectification prescriptions of an eye optical system comprising focus separation and image dispersion, the visual acuity of a vision system, the Strehl ratio and contrast sensitivity functions, and provides the change curve of the wave front aberration of large pupils and large visual fields along with a Zernike unfolding item under dark vision to diagnose night vision diseases. The utility model provides a contrast sensitivity function of a retina system to further diagnose retina diseases.
Description
Technical field
The invention belongs to the medical diagnosis instrument field.
Background technology
Eyes are most important organs that the mankind obtain external information, and vision detects and visual diagnostic relates to the almost major issue of all healths of masses.Vision-based detection can trace back to for 13rd century, up to now, and the human research that never stops vision detection and visual diagnostic.Detect about vision, Chinese patent 93105047.2 discloses Computerized multifunction optometric instrument, and Chinese patent 99254324.X discloses a kind of novel eyesight detecting instrument, and Chinese patent 99233794.1 discloses a kind of vision checkout gear.These visions detect the corrective prescription that can only provide eye optical system out of focus (myopia and hypermetropia) and astigmatism (astigmatism), can not provide the corrective prescription of other aberration of eye optical system.These existing vision checkout gears are subjective measurements, and the master that measurement accuracy depends on object states, and measuring speed is slower.About the detection of visual contrast sensitivity, Chinese patent 89104565.1 discloses multifunctional colour contrast sensitivity detector, and Chinese patent 02806082.2 discloses comparison diagram device, contrast visual sense degree measuring device and contrast visual sense degree measuring method.In addition, these measuring methods can only provide the contrast sensitivity function of whole visual system, it comprises the influence of retina system and eye optical system, therefore, can not make diagnosis accurately to human eye retina's disease according to the contrast sensitivity function of whole visual system.
Summary of the invention
In order to overcome the deficiency of existing eyesight detecting instrument and visual contrast sensitivity checkout gear, this utility model provides a kind of wavefront visual diagnostic instrument.This wavefront visual diagnostic instrument has following measuring ability and advantage:
Function one, this wavefront visual diagnostic instrument can determine the wave front aberration of human eye in less than 0.1 second time, this wave front aberration has been described the optics of the eye system more all sidedly and has been comprised the characteristic of out of focus, astigmatism and other senior aberration, thereby writes out a prescription for eye optical system provides ten grades of aberration corrections that comprise out of focus, astigmatism.
Function two, this wavefront visual diagnostic instrument can detect the objective judgment criteria of human eye visual function: Strehl (this Paul Tellier) ratio.
Function three, this wavefront visual diagnostic instrument can detect the contrast sensitivity function of retina system, can make diagnosis accurately to retinal diseases according to the contrast sensitivity function of detected retina system.
Function four, this wavefront visual diagnostic instrument can determine big pupil under the scotopic vision, big visual field wave front aberration, and the change curve that launches with Ze Nike (Zernike) of the wave front aberration that provides under the scotopic vision big pupil, big visual field, can realize diagnosis according to this curve to the night vision disease.
Function five, this wavefront visual diagnostic instrument can determine does not have the Snazzi of retinal diseases eye degree (vision).This measuring method is the objective measurement that does not rely on the object main suit, and measuring speed is fast, and measuring process can be finished within 1 second, and provides measurement result.
The technical scheme that its technical problem that solves this utility model adopts is:
Wavefront visual diagnostic instrument is made of wave-front optical aberration measurement device, figure threshold value visual system contrast sensitivity function measuring device, computer and outut device.
It is light source that the wave-front optical aberration measurement device adopts laser diode LD, and the beam collimation that passing through a collimating system that is made of microcobjective, pin hole, collimating lens and the light beam focusing system that is made of reflecting mirror, polarization beam apparatus, extender lens send light source LD also focuses on the retina; Adopt the wavefront division of the light beam that lenslet array will come out by retinal reflex to become the plurality of sub wavefront, and the array light spot image will be formed before all wavelets, the lenslet center distance of lenslet array is less than 0.3mm, and lenslet so disposes, so that it can provide resolving power to ten grades of aberrations; Adopt CCD as image received device, the receiving array light spot image.
Image received device CCD links to each other with computer, with the array light spot image input computer that receives, compare with the standard picture of storing in advance in the computer, and, draw the wavefront aberration data and ten grades of aberration corrections prescriptions that comprise out of focus, astigmatism of tested eye by Flame Image Process and wave-front reconstruction.Computer utilizes the wavefront aberration data of described tested eye and subretinal space as modulation degree (AIM) curve, further calculates, and then obtains MTF, the Snazzi degree of optics of the eye system, the objective judgment criteria of eye visual function: Strehl (this Paul Tellier) ratio.
The wave-front optical aberration measurement device adopts LED to stare target as big visual field, LED and describedly can be regulated by the distance between the light beam of retinal reflex, and then regulate describedly by the angle between the light beam of retinal reflex and the eye axle, reach the purpose of measuring the big visual field of eyes wave front aberration.With the change curve that Ze Nike (Zernike) launches, can realize diagnosis according to the wave front aberration of big pupil, big visual field under the tested eye scotopic vision of measuring to the night vision disease.
Wavefront visual diagnostic instrument adopts figure threshold value visual system contrast sensitivity function measuring device to measure the whole visual system contrast sensitivity function of eye, and described figure threshold value visual system contrast sensitivity function measuring device comprises display screen for graphic presentation, graphics controller, plane mirror.Described plane mirror and described light beam angle at 45 by retinal reflex, display screen for graphic presentation is identical to the distance of tested eye with described pin hole to the distance of tested eye; Display screen for graphic presentation is controlled by graphics controller, produces the grating fringe of different space frequency, different fringe contrasts.According to the resolving power of tested eye, determine the whole visual system contrast sensitivity function of eye to the grating fringe of different space frequency, different fringe contrasts.
Figure threshold value visual system contrast sensitivity function measuring device is connected with computer, in the whole visual system contrast sensitivity function input of the tested eye that tests out computer, and utilize the MTF of described optics of the eye system, calculate the contrast sensitivity function of retina system, and then retinal diseases is made diagnosis accurately.
Computer is connected with outut device, output visual diagnostic result.
Specify embodiment of the present invention below in conjunction with accompanying drawing.
Description of drawings
Accompanying drawing 1 is a wavefront visual diagnostic instrument structure principle chart of the present invention.
Accompanying drawing 2 is schematic diagrams of wavefront aberration measuring device (1) and figure threshold value visual system contrast sensitivity function measuring device (3) among Fig. 1.
As shown in Figure 2, in the wavefront aberration measuring device, laser diode LD (5) sends the light of 0.78 μ m, focus of the light beam on the pin hole (7) by microcobjective (6), the collimated lens of light beam (8) are collimated into collimated light beam then, reflex to polarization beam apparatus (10) through reflecting mirror (9), after polarization beam apparatus (10) reflection, by extender lens (11,12) enter tested eye (13), drop on retina (14) and go up minimum luminous point of formation, this luminous point is reflected by retina (14), through polarization beam apparatus (10) and extender lens (11,12,15,16) after, incide on the lenslet array (17).The array light spot image that lenslet array (17) forms is received by CCD (18), and CCD (18) is connected with computer (2), and the array light spot image is sent in the computer (2).As Fig. 1 further described, computer (2) was handled and wave-front reconstruction the array light spot image then, drew the wavefront aberration data and ten grades of aberration corrections prescriptions that comprise out of focus, astigmatism of tested eye.Computer (2) further calculates the wavefront aberration data of described tested eye as modulation degree (AIM) curve (3) in conjunction with subretinal space, and then obtains the MTF, Snazzi degree of optics of the eye system, the objective judgment criteria of eye visual function: Strehl (this Paul Tellier) ratio.
For measuring the big visual field of eyes wave front aberration, the distance that big visual field is stared between the light beam of target LED (21) and incident eyes can be regulated, when measuring the big visual field of eyes wave front aberration, tested eye moves with staring target LED (21), change the angle of incidence of the measuring beam that enters eyes, reach the purpose of measuring the big visual field of eyes wave front aberration.
Figure threshold value visual system contrast sensitivity function measuring device (4) is made up of display screen for graphic presentation (20), graphics controller (21) and plane mirror (22).Plane mirror (22) and systematic optical axis angle at 45, display screen for graphic presentation (20) is identical to the distance of tested eye with pin hole (7) to the distance of tested eye, graphics controller (21) control display screen for graphic presentation (20) produces the grating fringe of different space frequency, different fringe contrasts, according to the resolving power of tested eye, determine the whole visual system contrast sensitivity function of eye to the grating fringe of different space frequency, different fringe contrasts.
Figure threshold value visual system contrast sensitivity function measuring device (4) is connected with computer (2), in the whole visual system contrast sensitivity function input of the tested eye that tests out computer, and utilize the MTF of described optics of the eye system, calculate the contrast sensitivity function of retina system, and then retinal diseases is made diagnosis accurately.
Computer is connected with outut device, output visual diagnostic result.
Claims (8)
1, a kind of wavefront visual diagnostic instrument, it is characterized in that: described visual diagnostic instrument comprises the wavefront aberration measuring device; Figure threshold value visual system contrast sensitivity function measuring device; One computer that links to each other; One outut device that links to each other with described computer is used to export the visual diagnostic result.
2, wavefront visual diagnostic instrument as claimed in claim 1 is characterized in that: described wavefront aberration measuring device comprises that one is used to produce the light supply apparatus by the point source image of retinal reflex; Target LED is stared in the one big visual field that is used to regulate field of view angle; One is used for the point source image of described retinal reflex is converted to the lenslet array of array light spot image; One is used to receive the image received device of described array light spot image.
3, wavefront visual diagnostic instrument as claimed in claim 1, it is characterized in that: the light supply apparatus in the described wavefront aberration measuring device is light source LD, microcobjective, pin hole, collimating lens, reflecting mirror, polarization beam apparatus, extender lens sequence arrangement, produces by the light beam of described retinal reflex.
4, wavefront visual diagnostic instrument as claimed in claim 1, it is characterized in that: the lenslet center distance of lenslet array is less than 0.3mm in the described wavefront aberration measuring device, and lenslet so disposes, so that it can provide resolving power to ten grades of aberrations.
5, wavefront visual diagnostic instrument as claimed in claim 1, it is characterized in that: to stare target LED be flexible connection with described light supply apparatus in big visual field in the described wavefront aberration measuring device, is used to regulate described by the angle between the light beam of retinal reflex and the eye axle.
6, wavefront visual diagnostic instrument as claimed in claim 1, it is characterized in that: image received device is connected with described computer in the described wavefront aberration measuring device, with the picture signal input computer that receives, computer is handled and wave-front reconstruction the image that receives, with the wavefront aberration data that obtains tested eye and ten grades of aberration correction prescriptions that comprise out of focus, astigmatism.Computer utilizes the wavefront aberration data of described tested eye and subretinal space as modulation degree (AIM) curve, further calculates, and then obtains MTF, the Snazzi degree of optics of the eye system, the objective judgment criteria of eye visual function: Strehl (this Paul Tellier) ratio.
7, wavefront visual diagnostic instrument as claimed in claim 1 is characterized in that: described figure threshold value visual system contrast sensitivity function measuring device comprises display screen for graphic presentation, graphics controller, plane mirror.Described plane mirror and described light-source system optical axis angle at 45; Display screen for graphic presentation is identical to the distance of tested eye with described pin hole to the distance of tested eye; Display screen for graphic presentation is controlled by graphics controller, produces the grating fringe of different space frequency, different fringe contrasts.
8, wavefront visual diagnostic instrument as claimed in claim 1, it is characterized in that: described figure threshold value visual system contrast sensitivity function measuring device is connected with computer, in the whole visual system contrast sensitivity function input of the tested eye that tests out computer, and, calculate the contrast sensitivity function of retina system in conjunction with the MTF of described optics of the eye system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420107135 CN2770573Y (en) | 2004-10-24 | 2004-10-24 | Wave front vision diagnostic instrument |
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| Application Number | Priority Date | Filing Date | Title |
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| CN 200420107135 CN2770573Y (en) | 2004-10-24 | 2004-10-24 | Wave front vision diagnostic instrument |
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| CN2770573Y true CN2770573Y (en) | 2006-04-12 |
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| CN 200420107135 Expired - Fee Related CN2770573Y (en) | 2004-10-24 | 2004-10-24 | Wave front vision diagnostic instrument |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103230254A (en) * | 2013-04-19 | 2013-08-07 | 饶丰 | Human eye chromatic aberration measuring device based on Hartmann sensor |
| CN103284687A (en) * | 2009-10-23 | 2013-09-11 | 佳能株式会社 | Ophthalmology imaging device and ophthalmology imaging method |
| CN110248590A (en) * | 2017-02-07 | 2019-09-17 | 卡尔蔡司光学国际有限公司 | Prescription determines |
-
2004
- 2004-10-24 CN CN 200420107135 patent/CN2770573Y/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103284687A (en) * | 2009-10-23 | 2013-09-11 | 佳能株式会社 | Ophthalmology imaging device and ophthalmology imaging method |
| CN103284687B (en) * | 2009-10-23 | 2015-03-25 | 佳能株式会社 | Ophthalmology imaging device and ophthalmology imaging method |
| CN103230254A (en) * | 2013-04-19 | 2013-08-07 | 饶丰 | Human eye chromatic aberration measuring device based on Hartmann sensor |
| CN110248590A (en) * | 2017-02-07 | 2019-09-17 | 卡尔蔡司光学国际有限公司 | Prescription determines |
| CN110623628A (en) * | 2017-02-07 | 2019-12-31 | 卡尔蔡司光学国际有限公司 | Prescription determination |
| US10765313B2 (en) | 2017-02-07 | 2020-09-08 | Carl Zeiss Vision International Gmbh | Prescription determination |
| US10863901B2 (en) | 2017-02-07 | 2020-12-15 | Carl Zeiss Vision International Gmbh | Prescription determination |
| CN110623628B (en) * | 2017-02-07 | 2022-01-04 | 卡尔蔡司光学国际有限公司 | Prescription determination |
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