CN101732029A - Wave-front aberration-based vision tester - Google Patents
Wave-front aberration-based vision tester Download PDFInfo
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- CN101732029A CN101732029A CN200910220455A CN200910220455A CN101732029A CN 101732029 A CN101732029 A CN 101732029A CN 200910220455 A CN200910220455 A CN 200910220455A CN 200910220455 A CN200910220455 A CN 200910220455A CN 101732029 A CN101732029 A CN 101732029A
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Abstract
The invention relates to a wave-front aberration-based vision tester, and belongs to the field of medicinal diagnostic devices. The wave-front aberration-based vision tester comprises a Hartmann-Shack sensor-based eye optical system wave-front aberration measuring device, a computer and output equipment, wherein the computer is connected with the eye optical system wave-front aberration measuring device; and the output equipment is connected with the computer. The vision tester can detect the vision of eyes objectively and accurately in one second.
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, human when cognitive world around about 95% information source in vision.The detection of visual function and visual diagnostic relate to the almost major issue of all healths of masses at all times.The visual function scope comprises shape feel, stereoscopic vision, light sensation, the visual field and colour vision etc.And the visual system most important function to be shape feel, shape feels that function is that visual acuity or Snazzi degree (visualacuity) are as the clinical evaluation index with vision usually.At present, vision detects and is divided into subjective refraction and objective refraction substantially.Subjective refraction adopts visual acuity chart to detect usually, and this detection method requires person under inspection's cooperation, and will prevent that the person under inspection from carrying on the back visual acuity chart, and this detection method detection speed is slower, and is subjective, and testing result depends on detected person's cognition and main stating.When carrying out the occupational detection, some detected person recites visual acuity chart in advance, makes testing result untrue.For young child, can not cooperate detection, can have some difficulties during detection, even can't detect.Though objective optometry instrument is simple to operate, detection speed is fast, but all eye refractometers all require the person under inspection to watch test mark picture attentively, can stimulate adjusting like this and make testing result myopia overcorrection or hypermetropia owe to correct, though some detector adopts test test-object " looking of mist " or " double vision mark ", loosen adjusting, but all can not eliminate adjusting fully.30% prescription error surpasses 0.50D according to statistics, and between the 1.6D, for regulating stronger teenager, its error is bigger at 0.75D for 10% prescription error, clinical main with it as the instrument of generally investigating.
Overcome the shortcoming of existing subjective refraction and objective refraction, objective, carry out vision quickly and accurately and detect and provide corrective prescription.
Summary of the invention
In order to overcome the shortcoming of existing subjective refraction and objective refraction, the invention provides a kind of based on wave front aberration ignore the target eyesight detecting instrument, this eyesight detecting instrument can determine the Snazzi degree (vision) of eyes.This eyesight detecting instrument is to ignore target, can not stimulate adjusting, and measurement result is accurate; 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.
The technical solution adopted for the present invention to solve the technical problems is:
Eyesight detecting instrument based on wave front aberration is made of eye optical system wave-front optical aberration measurement device, computer and outut device based on the Shack-Hartmann pick off.
Eye optical system wave-front optical aberration measurement device employing laser diode LD based on the Shack-Hartmann pick off is a light source, and light source is placed the background identical with light source color, can not stimulate detected person's adjusting like this.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; Lenslet array and CCD constitute the Shack-Hartmann pick off, the wavefront division of the light beam that lenslet array will be come out by retinal reflex becomes 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, lenslet so disposes, so that it can provide resolving power to ten rank Ze Nike (Zernike) aberrations; Employing CCD is an 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 the Snazzi degree of optics of the eye system.
Computer is connected with outut device, and ten grades of aberration corrections that comprise out of focus, astigmatism of output optics of the eye system are write out a prescription and the vision testing result.
Principle of the present invention:
(1) the eyes wave front aberration of at first measuring from Hartmann-Shack Wavefront sensor human eye aberration instrument, the optical-modulation transfer function (MTF) of calculating opthalmic optics system.
Earlier by wave front aberration w (x, y) structure pupil function P (x, y):
P(x，y)＝p(x，y)exp[iw(x，y)]
Wherein, r: pupil radius.
Optical transfer function (OTF) be pupil function P (x, self correlation y):
OTF(x，y)＝∫P(x′，y′)P
*(x′-x，y′-y)dx′dy′
Modulation transfer function (MTF) is the mould of optical transfer function (OTF):
MTF＝|OTF|
(2) the maximum space resolution of calculating human eye.
People such as nineteen ninety Smith have proposed the desired modulation degree curve of retina resolving power, i.e. the AIM curve
[1]The pairing spatial frequency f of intersection point of human eye modulation transfer function (MTF) MTF and retina modulation degree AIM curve
0(cycle/deg), promptly the pairing abscissa of this intersection point is the maximum space resolution of human eye.
(3) calculate Snazzi degree (vision).
Maximum space resolution f according to human eye
0, can obtain visual function parameter Snazzi degree.External object is decided by foreign object imaging size on retina by the size sensation that eyes cause.Have according to geometric optical theory:
The sighting target of general visual acuity chart angle before eyes is all very little, and the tangent value of angle can be thought the radian value that equals angle, Here it is visual angle.Therefore sensuously the foreign object size just is decided by the size at contained visual angle.
The definition of vision: vision is exactly the ability that eyes can be differentiated minimum range between two object points, and weighs with the visual angle.Discernmible visual angle is more little, and vision is good more, thus express vision with the inverse at visual angle usually, so vision is the visual angle size of the minimum sighting target that be able to recognize of human eye, highly represents the visual angle size of sighting target with measuring distance and letter.That is:
Measuring distance be generally 20 feet or 6 meters (the U.S. with 20 feet as measuring distance, the country of other metric unit usually with 6 meters as measuring distance).Denominator " relative 5 minutes letter distance " is meant when measuring distance is 20 feet or 6 meters, the alphabetical pairing distance of relative 5 subangles of height of minimum that the tester can differentiate.Vision as 20/200 is represented: measuring distance is 20 feet, and the distance of relative 5 subangles of height of the discernmible minimum letter of tester is 200 feet.
Decimal vision symbol is to change mark into the decimal form.Vision as 20/200 is 0.1.
Human eye is at maximum space resolution f
0(cycle/deg) time, the minimum angle that human eye can be differentiated is 1/f
0, pairing height at 20 feet minimum letters of locating to differentiate is 2.5 * 20 * (1/f
0), wherein 2.5 is that sighting target " E " is 2.5 cycles.Relative 5 subangles of this alphabetical height, promptly the pairing distance L of 5/60 degree is:
Pairing vision is:
VA＝20/L＝f
0/30
Wherein, VA is the Snazzi degree with fractional representation, f
0Dimension be cycle/deg.By above-mentioned derivation as can be known, can calculate the MTF curve, can draw human eye maximum space resolution by the intersection point of MTF curve and AIM curve, and then can learn the Snazzi degree of human eye according to human eyes wave-front optical aberration.Therefore by measuring human eyes wave-front optical aberration, can obtain this visual function parameter of Snazzi degree.
Specify embodiment of the present invention below in conjunction with accompanying drawing.
Description of drawings
Accompanying drawing 1 is the structure principle chart that the present invention is based on the eyesight detecting instrument of wave front aberration.
As shown in Figure 1, laser diode LD (1) sends the light of 0.78 μ m, focus of the light beam on the pin hole (3) by microcobjective (2), the collimated lens of light beam (4) are collimated into collimated light beam then, reflex to polarization beam apparatus (6) through reflecting mirror (5), after polarization beam apparatus (6) reflection, by extender lens (7,8) enter tested eye (9), drop on retina (10) and go up minimum luminous point of formation, this luminous point is reflected by retina (10), through polarization beam apparatus (6) and extender lens (7,8,11,12) after, incide on the lenslet array (13).The array light spot image that lenslet array (13) forms is received by CCD (14), and CCD (14) is connected with computer (15), and the array light spot image is sent in the computer (15).Computer (15) is handled and wave-front reconstruction the array light spot image then, draws the wavefront aberration data of tested eye.
Computer (15) utilizes the wavefront aberration data of described tested eye and subretinal space as modulation degree (AIM) curve, can calculate the Snazzi degree of people's eye.
Computer is connected with outut device (16), output vision testing result.
Claims (5)
1. eyesight detecting instrument based on wave front aberration is characterized in that: described eyesight detecting instrument based on wave front aberration comprises the optics of the eye system wave-front optical aberration measurement device based on the Shack-Hartmann pick off; One computer that links to each other; One outut device that links to each other with described computer.
2. the eyesight detecting instrument based on wave front aberration as claimed in claim 1 is characterized in that: described optics of the eye system wave-front optical aberration measurement device based on the Shack-Hartmann pick off comprises that one is used to produce the light supply apparatus by the point source image of retinal reflex; 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 ccd image receiving system of described array light spot image.
3. the eyesight detecting instrument based on wave front aberration as claimed in claim 1 is characterized in that: described is light source LD, microcobjective, pin hole, collimating lens, reflecting mirror, polarization beam apparatus, extender lens sequence arrangement based on the light supply apparatus in the optics of the eye system wave-front optical aberration measurement device of Shack-Hartmann pick off.
4. the eyesight detecting instrument based on wave front aberration as claimed in claim 1 is characterized in that: described lenslet center distance based on lenslet array in the optics of the eye system wave-front optical aberration measurement device of Shack-Hartmann pick off is less than 0.3mm.
5. the eyesight detecting instrument based on wave front aberration as claimed in claim 1 is characterized in that: in the described optics of the eye system wave-front optical aberration measurement device based on the Shack-Hartmann pick off, the ccd image receiving system is connected with described computer.
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102462485A (en) * | 2010-11-18 | 2012-05-23 | 沈阳理工大学 | Human eye optical system modulation transfer function detector based on wavefront aberration |
| CN104159498A (en) * | 2012-01-10 | 2014-11-19 | 迪吉塔尔视觉有限责任公司 | A refractometer with a remote wavefront generator |
| CN104257346A (en) * | 2014-10-21 | 2015-01-07 | 吉林大学 | Visual-sign-free eye wavefront aberration detector |
| CN104274152A (en) * | 2014-08-04 | 2015-01-14 | 上海嫦娥光学仪器科技有限公司 | Medical refractormeter and refraction method thereof |
| CN106530923A (en) * | 2016-10-18 | 2017-03-22 | 温州医科大学 | Simulation eye with adjustable aberration based on spatial light modulator, and aberration adjustment method for simulation eye |
| CN108577801A (en) * | 2018-01-16 | 2018-09-28 | 天津工业大学 | Portable stereoscopic is imaged fundus camera optical system |
| CN109199320A (en) * | 2018-07-27 | 2019-01-15 | 上海贝高医疗科技有限公司 | A kind of portable visual acuity screening instrument and its light channel structure |
| CN109512380A (en) * | 2018-11-02 | 2019-03-26 | 爱尔眼科医院集团股份有限公司 | The method for making full retina dioptric topographic map based on wavefront sensing technique |
| CN110573061A (en) * | 2017-03-05 | 2019-12-13 | 沃缇奥普特蔻有限公司 | Ophthalmologic examination method and apparatus |
-
2009
- 2009-12-04 CN CN200910220455A patent/CN101732029A/en active Pending
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102462485A (en) * | 2010-11-18 | 2012-05-23 | 沈阳理工大学 | Human eye optical system modulation transfer function detector based on wavefront aberration |
| CN104159498A (en) * | 2012-01-10 | 2014-11-19 | 迪吉塔尔视觉有限责任公司 | A refractometer with a remote wavefront generator |
| CN104274152A (en) * | 2014-08-04 | 2015-01-14 | 上海嫦娥光学仪器科技有限公司 | Medical refractormeter and refraction method thereof |
| CN104274152B (en) * | 2014-08-04 | 2016-09-14 | 上海嫦娥光学仪器科技有限公司 | A kind of medical treatment eye refractometer and optometry method thereof |
| CN104257346A (en) * | 2014-10-21 | 2015-01-07 | 吉林大学 | Visual-sign-free eye wavefront aberration detector |
| CN106530923A (en) * | 2016-10-18 | 2017-03-22 | 温州医科大学 | Simulation eye with adjustable aberration based on spatial light modulator, and aberration adjustment method for simulation eye |
| CN110573061A (en) * | 2017-03-05 | 2019-12-13 | 沃缇奥普特蔻有限公司 | Ophthalmologic examination method and apparatus |
| CN108577801A (en) * | 2018-01-16 | 2018-09-28 | 天津工业大学 | Portable stereoscopic is imaged fundus camera optical system |
| CN108577801B (en) * | 2018-01-16 | 2023-12-01 | 天津工业大学 | Portable three-dimensional imaging fundus camera optical system |
| CN109199320A (en) * | 2018-07-27 | 2019-01-15 | 上海贝高医疗科技有限公司 | A kind of portable visual acuity screening instrument and its light channel structure |
| CN109512380A (en) * | 2018-11-02 | 2019-03-26 | 爱尔眼科医院集团股份有限公司 | The method for making full retina dioptric topographic map based on wavefront sensing technique |
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Open date: 20100616 |