CN106725287B - A kind of non-cpntact measurement device and method of ocular biometric parameters - Google Patents
A kind of non-cpntact measurement device and method of ocular biometric parameters Download PDFInfo
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- CN106725287B CN106725287B CN201710081624.4A CN201710081624A CN106725287B CN 106725287 B CN106725287 B CN 106725287B CN 201710081624 A CN201710081624 A CN 201710081624A CN 106725287 B CN106725287 B CN 106725287B
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- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B3/00—Apparatus for testing the eyes; Instruments for examining the eyes
- A61B3/10—Objective types, i.e. instruments for examining the eyes independent of the patients' perceptions or reactions
- A61B3/102—Objective types, i.e. instruments for examining the eyes independent of the patients' perceptions or reactions for optical coherence tomography [OCT]
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- A—HUMAN NECESSITIES
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- A61B3/00—Apparatus for testing the eyes; Instruments for examining the eyes
- A61B3/0008—Apparatus for testing the eyes; Instruments for examining the eyes provided with illuminating means
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B3/00—Apparatus for testing the eyes; Instruments for examining the eyes
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- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B3/00—Apparatus for testing the eyes; Instruments for examining the eyes
- A61B3/10—Objective types, i.e. instruments for examining the eyes independent of the patients' perceptions or reactions
- A61B3/107—Objective types, i.e. instruments for examining the eyes independent of the patients' perceptions or reactions for determining the shape or measuring the curvature of the cornea
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- A61B3/11—Objective types, i.e. instruments for examining the eyes independent of the patients' perceptions or reactions for measuring interpupillary distance or diameter of pupils
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- A61B3/00—Apparatus for testing the eyes; Instruments for examining the eyes
- A61B3/10—Objective types, i.e. instruments for examining the eyes independent of the patients' perceptions or reactions
- A61B3/11—Objective types, i.e. instruments for examining the eyes independent of the patients' perceptions or reactions for measuring interpupillary distance or diameter of pupils
- A61B3/112—Objective types, i.e. instruments for examining the eyes independent of the patients' perceptions or reactions for measuring interpupillary distance or diameter of pupils for measuring diameter of pupils
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- A—HUMAN NECESSITIES
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- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B3/00—Apparatus for testing the eyes; Instruments for examining the eyes
- A61B3/10—Objective types, i.e. instruments for examining the eyes independent of the patients' perceptions or reactions
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Abstract
The invention discloses a kind of non-cpntact measurement device and method of ocular biometric parameters, the equipment includes：Axis oculi parameter measuring apparatus and picture signal harvester；The axis oculi parameter measuring apparatus includes：Weak coherent light source, fiber coupler detect arm component and signal acquisition component with reference to arm component；Described image signal pickup assembly includes：High speed camera and light fixture.Device provided by the present invention, so that the measurement process of axis oculi parameter is without being manually adjusted, and is passed through using weak coherent light and calibrated with reference to arm component, high certainty of measurement, and pass through direct projection organism eyes after detection arm component collimation, while reducing the measured sense of discomfort using the property of weak coherent light, improves its investigation depth, realizes full axis measurement.It solves keratometer in the prior art to need to manually adjust, and causes measurement error bigger than normal, comfort is low；And optical coherence analysis imaging detection depth is insufficient, cannot be satisfied the problem of full axis measurement needs.
Description
Technical field
The present invention relates to the non-cpntact measurement device and method more particularly to one kind of a kind of ocular biometric parameters to pass through
Weak coherent light interference technique measures axis oculi parameter, while acquiring the non-cpntact measurement equipment of data image signal ocular biometric parameters
And method.
Background technology
The special instrument for measuring corneal curvature at present（Keratometer）, it needs to manually adjust, artificial judgment position, so
Read afterwards above instrument above dial as a result, although this method can measure corneal curvature radius, in measurement
When, artificial factor is introduced, when causing the error measured can be bigger than normal, while measure, needs measured for a long time
Luminous object is stared at, eyes have sense of discomfort.
Also there are non-cpntact measurement means, optical coherent chromatographic imaging（OCT, opticalCoherence Tomograph）,
This is a kind of high-precision optical detector technology, is the novel means of contactless high-precision imaging, the advantage is that non-contact, nothing
Injury detection, can be penetrated into its internal observation inner case, detection accuracy is very high.But the depth of its detection has very much
Limit, cannot meet full axis measurement needs by only several millimeters.
Therefore, the existing technology needs to be improved and developed.
Invention content
In view of above-mentioned deficiencies of the prior art, the purpose of the present invention is to provide a kind of non-contact surveys of ocular biometric parameters
Measure device and method, it is intended to solve keratometer needs in the prior art and manually adjust, and cause measurement error bigger than normal, comfortably
Property is low；And optical coherence analysis imaging detection depth is insufficient, cannot be satisfied the problem of full axis measurement needs.
Technical scheme is as follows：
A kind of non-cpntact measurement equipment of ocular biometric parameters, wherein the non-cpntact measurement of the ocular biometric parameters is set
It is standby to include：
For the axis oculi parameter measuring apparatus by weak coherent light interference technique, measurement axis oculi parameter, and for acquiring
The picture signal harvester of data image signal；
The axis oculi parameter measuring apparatus includes：For generating weak coherent light, to be concerned with as non-contact the weak of detection light
Light source；
And for weak coherent light produced by weak coherent light source to be divided into two-way and respectively at reference to arm component and feeler arm
It is handled in component；And after optical heterodyne modulation will be carried out by the reflected light of reference arm component, output to photoelectricity
The fiber coupler of conversion equipment；
And for being collimated to the another way weak coherent light for coming from fiber coupler after, be reflected back fiber coupler
Reference arm component；
And for being collimated to the another way weak coherent light for coming from fiber coupler after, output is to organism eyes
Detection arm component；
And exported to computer for the optical signal for coming from fiber coupler to be converted to digital signal, to be located
The signal acquisition component of reason；
Described image signal pickup assembly includes：Data image signal for obtaining organism eyes, and export to meter
The high speed camera that calculation machine is handled；
And for acquiring the light fixture that data image signal provides illumination for high speed camera.
In preferred embodiment, the non-cpntact measurement equipment of the ocular biometric parameters, wherein described to refer to arm component packet
It includes：
The first collimator that weak coherent light all the way for that will come from fiber coupler collimates；
And for by the weak coherent light after first collimator collimates, first to be input to instead after carrying out rotation light path scanning
Penetrate the rotary light path sweep unit of mirror；
And the first speculum reflected for the light of rotary light path sweep unit will to be come from.
In preferred embodiment, the non-cpntact measurement equipment of the ocular biometric parameters, wherein the rotary light path scanning
Component includes：
Rotating body, and it is connected to the rotating body, four right angles reflection with the rotating body synchronous rotary
Prism；It is all coated with high reflection deielectric-coating on the right-angle side of four right angle reflex prisms, anti-reflection film is coated on bevel edge.
In preferred embodiment, the non-cpntact measurement equipment of the ocular biometric parameters, wherein four right angle reflections three
The square entirety in a cross section is formed after prism assembly.
In preferred embodiment, the non-cpntact measurement equipment of the ocular biometric parameters, wherein the detection arm component packet
It includes：
The second collimator for collimating the another way weak coherent light for coming from fiber coupler；
And for the light after the second collimator collimation is saturating into line convergence, the flat optics of liquids worn or dissipate processing
Mirror.
In preferred embodiment, the non-cpntact measurement equipment of the ocular biometric parameters, wherein the signal acquisition component packet
It includes：
For the optical signal for coming from fiber coupler will to be converted to the photoelectric conversion part of electric signal；
And for the accessible digital signal of computer will to be converted to through the transformed electric signal of photoelectric conversion part
Digital analog converter.
In preferred embodiment, the non-cpntact measurement equipment of the ocular biometric parameters, wherein the weak coherent light source and light
One first Polarization Controller is provided between fine coupler.
In preferred embodiment, the non-cpntact measurement equipment of the ocular biometric parameters, wherein the fiber coupler and
One second Polarization Controller is provided between collimator.
In preferred embodiment, the non-cpntact measurement equipment of the ocular biometric parameters, wherein the fiber coupler and
A third Polarization Controller is provided between two collimators.
The ocular bioavailability that a kind of non-cpntact measurement equipment by the ocular biometric parameters any one of as above is realized
The non-contact measurement method of parameter, wherein the non-contact measurement method of the ocular biometric parameters includes：
Weak coherent light source is generated and transmitted by weak coherent light, using as non-contact detection light；
Fiber coupler weak coherent light produced by weak coherent light source be divided into two-way and respectively at refer to arm component and detection
It is handled in arm component；
With reference to arm component to coming from after weak coherent light collimates all the way of fiber coupler, it is reflected back fiber coupling
Device, while arm component is detected to coming from after weak coherent light collimates all the way of fiber coupler, output to organism eyes；
After fiber coupler will be by carrying out optical heterodyne modulation with reference to the reflected light of arm component, output to photoelectricity turns
Changing device；
The optical signal for coming from fiber coupler is converted to digital signal and exported to computer by signal acquisition component, with into
Row processing；
Light fixture acquires data image signal for high speed camera and provides illumination, and high speed camera obtains the number of organism eyes
Word picture signal, and export to computer and handled.
Compared with prior art, the non-cpntact measurement equipment of ocular biometric parameters provided by the present invention, as a result of
For the axis oculi parameter measuring apparatus by weak coherent light interference technique, measurement axis oculi parameter, and for acquiring digital picture
The picture signal harvester of signal；The axis oculi parameter measuring apparatus includes：For generating weak coherent light, using as non-contact
Detect the weak coherent light source of light；And for weak coherent light produced by weak coherent light source to be divided into two-way and respectively at reference arm
It is handled in component and detection arm component；And it will be by carrying out optical heterodyne modulation with reference to the reflected light of arm component
Afterwards, it exports to the fiber coupler of photoelectric conversion device；And for the another way weak coherent light to coming from fiber coupler
After being collimated, it is reflected back the reference arm component of fiber coupler；And for weak to the another way for coming from fiber coupler
After coherent light is collimated, export to the detection arm component of organism eyes；And the light for fiber coupler will to be come from
Signal is converted to digital signal and exports to computer, with the signal acquisition component handled；Described image signal pickup assembly
Including：Data image signal for obtaining organism eyes, and export the high speed camera handled to computer；And it uses
In the light fixture for providing illumination for high speed camera acquisition data image signal.So that the measurement process of axis oculi parameter is without carrying out
It manually adjusts, and is passed through using weak coherent light and calibrated with reference to arm component, high certainty of measurement, and by straight after detection arm component collimation
Organism eyes are penetrated, while reducing the measured sense of discomfort using the property of weak coherent light, its investigation depth is improved, realizes entirely
Axis measurement.It solves keratometer in the prior art to need to manually adjust, and causes measurement error bigger than normal, comfort is low；
And optical coherence analysis imaging detection depth is insufficient, cannot be satisfied the problem of full axis measurement needs.
Description of the drawings
Fig. 1 is the structural schematic diagram of the non-cpntact measurement equipment preferred embodiment of ocular biometric parameters in the present invention.
Fig. 2 is the index path of the non-cpntact measurement equipment preferred embodiment of ocular biometric parameters in the present invention.
Fig. 3 is the rotary light path scanner section of the non-cpntact measurement equipment preferred embodiment of ocular biometric parameters in the present invention
Part principle schematic.
Fig. 4 is the liquid optic lens principle of the non-cpntact measurement equipment preferred embodiment of ocular biometric parameters in the present invention
Schematic diagram.
Fig. 5 is the light fixture image-forming principle of the non-cpntact measurement equipment preferred embodiment of ocular biometric parameters in the present invention
Schematic diagram.
Specific implementation mode
The present invention provides a kind of non-cpntact measurement device and method of ocular biometric parameters, to make the purpose of the present invention, skill
Art scheme and effect are clearer, clear, referring to the drawings and give an actual example that the present invention is described in more detail.It should manage
Solution, the specific embodiments described herein are merely illustrative of the present invention, is not intended to limit the present invention.
Treating cataract, most ripe also most common method is phacoemulsification technique at present, i.e., by the white interior of lesion
Hinder tissue and passes through implantable artificial crystal again after ultrasonic emulsification.And in order to improve success rate of operation and surgical effect, in operation
Before need to organism axis oculi parameter carry out high-acruracy survey.
Domestic main measuring technique is to be measured using A is super, that is, measure optical axis parameter by ultrasonic echo at present, this
Kind method is needed human eye local anaesthesia, and being pressed in anterior corneal surface with the super detections of A measures, the precision due to ultrasound and operator
Qualification, can cause to measure at least error of 0.15mm or more, this is the biggest obstacle of high-precision cataract operation.
Cataract operation not only needs axis measurement as a result, also requiring corneal diopter, that is, corneal curvature radius.And
The defect measured due to prior art axis oculi parameter especially corneal curvature radius so that success rate of operation still has defect.For
Solution the deficiencies in the prior art, it is as follows that the present invention provides technical solution：
As shown in Figures 1 and 2, the present invention provides a kind of non-cpntact measurement equipment of ocular biometric parameters comprising：With
In the axis oculi parameter measuring apparatus by weak coherent light interference technique, measurement axis oculi parameter, and for acquiring digital picture letter
Number picture signal harvester；
The axis oculi parameter measuring apparatus includes：For generating weak coherent light, to be concerned with as non-contact the weak of detection light
Light source 1；And for weak coherent light produced by weak coherent light source 1 to be divided into two-way and respectively at reference to arm component and feeler arm
It is handled in component；And after optical heterodyne modulation will be carried out by the reflected light of reference arm component, output to photoelectricity
The fiber coupler 3 of conversion equipment 17；And for being collimated to the another way weak coherent light for coming from fiber coupler 3
Afterwards, the reference arm component of fiber coupler 3 is reflexed to；And for the another way weak coherent light to coming from fiber coupler 3
After being collimated, export to the detection arm component of organism eyes 15；And the optical signal for fiber coupler 3 will to be come from
It is converted to digital signal to export to computer 19, with the signal acquisition component handled；
Described image signal pickup assembly includes：Data image signal for obtaining organism eyes 15, and export extremely
The high speed camera 12 that computer 19 is handled；
And for acquiring the light fixture 13 that data image signal provides illumination for high speed camera 12.
Frequency is identical, and the identical light of direction of vibration can be described as coherent light (i.e. coherent light must be linearly polarized light), and two beams are full
The light of sufficient coherent condition is alternatively referred to as coherent light；Weak coherent light is exactly the very weak light of coherence.
Fiber coupler 3 is separately connected weak coherent light source 1, photodetector by its four connecting pins 35（It is not shown）,
With reference to arm component and detection arm component；Four connecting pins 35 include two input terminals, two output ends, and two input terminals connect respectively
Weak coherent light source 1 and photodetector are connect, two output ends are then separately connected with reference to arm component and detection arm component.Feeler arm group
Part is to coming from weak coherent light all the way i.e. the second road weak coherent light of fiber coupler 3（It is referred in arm component to distinguish over
Weak coherent light all the way detects the weak coherent light in arm component and can be described as the second road weak coherent light, and refers in arm component all the way
Weak coherent light then can be described as first via weak coherent light）, exported to organism eyes 15 after being collimated.
In present pre-ferred embodiments, the non-cpntact measurement equipment of the ocular biometric parameters further includes：Computer 19, institute
Computer 19 is stated for handling digital signal and data image signal, when capturing tested axis oculi, can be seen when in computer 19
When to axis oculi signal, then it can be assumed that capturing axis oculi success.
Axis oculi parameter measuring apparatus of the present invention be Michael's interferometer system, mainly by weak coherent light source 1, be located at
Weak coherent light source 1 is close to the first Polarization Controller 2 of the measured side, positioned at the first Polarization Controller 2 close to the measured
The fiber coupler 3 of side close to the reference arm component of the measured side and detects arm component, institute positioned at fiber coupler 3
It states and is alternatively referred to as reference arm light path and feeler arm light path and signal acquisition component with reference to arm component and detection arm component, with letter
Number acquisition component carries out 19 signal processing unit of computer of data exchange.
It is as follows simply to introduce each component part：The reference arm component includes first collimator 5, rotary light path scanner section
Part 7 and the first speculum 9.
The detection arm component includes the second collimator 11 and liquid optic lens 13, as shown in figure 4, the optics of liquids
Lens 13 are optical lens and liquid lens combination, and liquid lens can be realized to be changed from concave surface to convex surface, and when concave surface is rendered as recessed
Lensing dissipates incident beam；When plane, it is rendered as flat glass；It is rendered as convex lens when convex surface, light beam is assembled.
Liquid lens is passing to 0V-70V voltages, it can be achieved that focal length is from -80mm to infinite, infinite to 8mm consecutive variations.
The signal acquisition component includes photoelectric conversion device 17 and a/d conversion device 18 i.e. digiverter.
The operation principle of axis oculi parameter measuring apparatus is as follows：Weak coherent light source 1 after powered up, sends out the weak phase for detection
Dry light light beam；Light beam incidence is transferred to fiber coupler 3 by the first Polarization Controller 2, and fiber coupler 3 is weak coherent light point
For two-way, reference arm light path and feeler arm light path are respectively enterd.
It is exported after the second Polarization Controller 4 is collimated by first collimator 5 from the weak coherent light of reference arm optical output,
The light beam of output is emitted after rotary light path sweep unit 7, and outgoing beam impinges perpendicularly on 9 surface of the first speculum, so
It is returned on the way by the reflection of the first speculum 9.
And it is collimated by the second collimator 11 from the weak coherent light beam of feeler arm optical output by third Polarization Controller 10
After export, the light beam of output focuses on the cornea, crystalline lens and retina of the measured eyes after liquid optic lens 13
On, extremely at least part of light is reflected back fiber coupler 3 by reflection of the light through the measured eyes then focused,
Light path with come when it is reversed.
Light is reflected from reference arm light path and feeler arm light path, optical heterodyne tune occurs inside fiber coupler 3
System generates interference signal, which can export through the optical patchcord end of fiber coupler 3, and the optical signal of output passes through
Photoelectric conversion device 17 is converted into electric signal, and electric signal can be obtained by 18 transform coding of a/d conversion device at PC processing units
Digital signal；Finally acquired digital signal is displayed on the screen after treatment on PC processing units.
And picture signal harvester includes high speed camera 12, the second speculum 22, dichroic mirror 20 and illumination in the present invention
Component 13, wherein light fixture 13 are the LED compositions that several encompass inside and outside two circle, bright for providing reliable illumination
Degree, while also the target as a set of geometry imaging device, light fixture 13 are imaged on cornea eye, have geometry to be imaged
Characteristic can be captured at the virtual image of a light fixture 13,13 virtual image of light fixture by high speed camera 12.13 institute of light fixture
It is preferably that 940nm radiates lighting source using light source, which can significantly distinguish pupil with cornea, utilize its spy
Property and existing image processing techniques, can be easy to obtain pupil diameters and corneal parameters, such as pupil diameter and corneal diameter.
The operation principle of picture signal harvester is as follows：Eyes imaging is through dichroic mirror 20, speculum to high speed camera 12
Afterwards, high speed camera 12 is transmitted to computer 19 after image information is converted to digital signal, by computer 19 to image digitization
Signal handle and be shown on screen after result of calculation to check eye image.
It describes in detail to the setting of axis oculi parameter measuring apparatus and picture signal harvester as follows：
When it is implemented, described include with reference to arm component：For will come from the weak coherent light all the way of fiber coupler 3 into
The first collimator 5 of row collimation；And for rotation light path scanning will to be carried out through the weak coherent light after the collimation of first collimator 5
It is input to the rotary light path sweep unit 7 of the first speculum 9 afterwards；And for rotary light path sweep unit 7 will to be come from
Light reflection the first speculum 9.
Collimator belongs in fiber optic communication optical device, for an optical element of input and output, setting purpose be by
The diverging light of optical fiber outflow becomes directional light (Gaussian beam) by preposition similar convex lens.
The rotary light path sweep unit 7 includes：Rotating body, and it is connected to the rotating body and the rotation
Turn four right angle reflex prisms of ontology synchronous rotary（Respectively 24,25,26 and 27）, as shown in Figure 3；Four right angles
It is all coated with high reflection deielectric-coating on the right-angle side of reflex prism, anti-reflection film is coated on bevel edge.
The square entirety in a cross section is formed after four right angle reflex prism assembly.
The operation principle of the rotary light path sweep unit 7 is：It is straight by servo motor drive rotating body and four
While corner reflection prism is rotated, light path scanning is realized.Principle of Rotating is the prior art, is no longer repeated.And light
Journey scan mode is：The bevel edge of light beam from one of right angle prism is incident, after being reflected on the plane of incidence, can fall at the right angle
On the right-angle side of prism, it is then to be coated with high reflection deielectric-coating on right-angle side, reflects light into the another of the right angle prism
On right-angle side, then it is reflected back on bevel edge, is finally emitted again.By optics geometry it is recognised that outgoing beam and incident beam
It is parallel, is based on such optics geometrical property, speculum 9 can be then always maintained at normal reflected light beam.
During not stopping rotation, it is above-mentioned scanned that execution is constantly recycled using four right angle prisms mutually spliced
Journey.
Four right angle prisms preferentially select to be made using different photoelectric materials, can by the computational methods of light path
Know, the refractive index of photoelectric material is bigger, and corresponding light path is also bigger.Therefore the corresponding scan depths of 4 kinds of photoelectric materials are incremented by, in this way
The light path of four Surface scans is all different, then can realize that the light path in four faces scans longitudinal continuous depth respectively,
The sum of the scan depths that four right angle prisms namely may be implemented can meet the scanning needs of axiallength completely.
The detection arm component includes：For what the another way weak coherent light for coming from fiber coupler 3 was collimated
Second collimator 11；And for by the light after the second collimator 11 collimation into line convergence, flat wear or dissipate the liquid handled
Bulk optics lens 13.
The signal acquisition component includes：For that the optical signal for coming from fiber coupler 3 will be converted to electric signal
Photoelectric conversion part；And for 19 accessible number of computer will to be converted to through the transformed electric signal of photoelectric conversion part
The digital analog converter of word signal.
The present invention further in preferred embodiment, is provided with one between the weak coherent light source 1 and fiber coupler 3
One Polarization Controller 2.And one second Polarization Controller 4 is provided between the fiber coupler 3 and first collimator 5.And institute
It states and is provided with a third Polarization Controller 10 between fiber coupler 3 and the second collimator 11.
Fig. 2 is the index path of present pre-ferred embodiments, sends out weak coherent light by weak coherent light source 1 first, partially through first
The controller 2 that shakes adjustment ray position is transmitted to light coupler, 3 output light first via weak coherent lights of fiber coupler and the
Two road weak coherent lights through the second Polarization Controller 4 and third Polarization Controller 10 are transmitted to first collimator 5 and second accurate respectively
Straight device 11, wherein first collimator 5 is transformed to the first collimated light beam 6 after collimating first via weak coherent light, and is sent to rotation
Then formula light path sweep unit 7 presses backtracking to light through rotary 7 reflection light of light path sweep unit to the first speculum 9
Line coupler, using as with reference to the light accuracy in light calibration detection arm component；And the second collimator 11 is weak by the second tunnel
It is transformed to the second collimated light beam 12 after coherent light collimation, and is sent to liquid optic lens 13, the liquid optic lens 13
According to situation by the second collimated light beam 12 into line convergence, diverging or it is flat wear after, be converted to laser beam 14, and export the laser light
Beam 14 exposes to organism eyes 15 through the through-hole among dichroic mirror 20, light fixture 13.As shown in figure 5, at this point, illumination group
13 provided illuminating ray of part is imaged on cornea 32, forms a diplopia 33, and diplopia 33 captures by high speed camera 12, then by
Computer 19 shows, and computer 19 is in image position and camera imaging principle according to diplopia 33, can calculate the reality of diplopia 33
Border size, and because diplopia 33 is imaged by organism eyes 15, therefore, glasses can be extrapolated using geometry imaging relations
The radius of curvature of cornea, i.e. corneal curvature parameter.Fiber coupler is returned respectively by organism eyes 15 and the first speculum 9
The processing method of light was described above, and details are not described herein.
Advantages of the present invention and effect are：
1, the present invention is the weak coherent measurement technology of non-contact optical, need not be anaesthetized to eyes, need not more press against eye
Eyeball, entire measurement process will not damage eyes.
2, present invention employs unique light path scan methods, can freely design light path scanning, provide and meet axiallength
Light path scanning, and the light path scan method is very stable, and there is no regression error, mechanical engagement errors etc..
3, the present invention is based on weak coherent light Detection Techniques, can be accurately positioned the position of eyes, are measuring the non-axis oculi of eyes
It when parameter, plays a key effect, this method is more accurate than positioning eyes by the digital picture energy gradient of camera imaging
Much, and speed is many soon.
4, present invention employs eye illuminations is illuminated using multiple spot, is cleverly devised illumination and target, is made equipment more
Add simply, cost is lower.
5, the method for the present invention, non-contact quick measurement ocular biometric parameters, can obtain a variety of ocular biometric parameters, including
Eye parameters（Corneal thickness, anterior chamber depth, lens thickness, axiallength etc.）With non-axis oculi parameter（Pupil diameter, cornea are straight
Diameter, corneal curvature etc.）, provide more comprehensive information technology to cataract operation and support.
Passing through the non-contact of any one of the technical solution as above ocular biometric parameters the present invention also provides a kind of
The non-contact measurement method for the ocular biometric parameters that measuring apparatus is realized comprising：
Weak coherent light source is generated and transmitted by weak coherent light, specific such as above-mentioned device embodiment using as non-contact detection light
It is described；
Fiber coupler weak coherent light produced by weak coherent light source be divided into two-way and respectively at refer to arm component and detection
It is handled in arm component, specifically as described in above-mentioned device embodiment；
With reference to arm component to coming from after weak coherent light collimates all the way of fiber coupler, it is reflected back fiber coupling
Device, while detecting arm component to coming from after weak coherent light collimates all the way of fiber coupler, output to organism eyes,
Specifically as described in above-mentioned device embodiment；
After fiber coupler will be by carrying out optical heterodyne modulation with reference to the reflected light of arm component, output to photoelectricity turns
Changing device, specifically as described in above-mentioned device embodiment；
The optical signal for coming from fiber coupler is converted to digital signal and exported to computer by signal acquisition component, with into
Row processing, specifically as described in above-mentioned device embodiment；
Light fixture acquires data image signal for high speed camera and provides illumination, and high speed camera obtains the number of organism eyes
Word picture signal, and export to computer and handled, specifically as described in above-mentioned device embodiment.
Its specific measurement method is：
（1）Activation system：Open system power supply lights weak coherent light source, opens reference arm light path scanning means, opens letter
The opto-electronic conversion and a/d conversion device of number acquisition component open PC processing units, system are allowed to enter preparation measuring state；
（2）Capture measured object：The mobile device, is directed at eyes, so that the light that feeler arm exports is passed through among eyes, finally
It falling on the retina, when can see axis oculi signal on PC processing units, then illustrating captured measured object success；
（3）Obtain ocular biometric parameters：After capturing measured object success, the acquisition computed push-buttom on device, device handle are pressed
The signal and high-definition digital picture signal of opto-electronic conversion are saved in PC processing units, by PC processing unit calculation processings, present
Go out the result of measurement on the screen；
（4）It samples for several times：Installation steps（2）And step（3）Continuous operation is multiple, the eye being calculated from PC processing units
Eyeball parametric results make mean value computation, to obtain more accurate more stable measurement result.
Other possible situations：For in measurement process, due to the automatic movement of eyes, measurement result may be influenced,
If repeatedly measurement finds that the result error measured is larger, this is that eyes do not feel mobile generation, then remeasuring, to obtain
Take true eye parameters result.
It should be understood that the application of the present invention is not limited to the above for those of ordinary skills can
With improvement or transformation based on the above description, all these modifications and variations should all belong to the guarantor of appended claims of the present invention
Protect range.
Claims (7)
1. a kind of non-cpntact measurement equipment of ocular biometric parameters, which is characterized in that the non-contact survey of the ocular biometric parameters
Measuring equipment includes：
For the axis oculi parameter measuring apparatus by weak coherent light interference technique, measurement axis oculi parameter, and for acquiring number
The picture signal harvester of picture signal；
The axis oculi parameter measuring apparatus includes：For generate weak coherent light, using as it is non-contact detection light weak coherent light source；
And for weak coherent light caused by weak coherent light source to be divided into two-way and respectively at reference to arm component and feeler arm group
It is handled in part；And after carrying out optical heterodyne modulation by the reflected light of reference arm component, output to photoelectricity turns
The fiber coupler of changing device；
And for coming from after weak coherent light collimates all the way of fiber coupler, being reflected back the reference of fiber coupler
Arm component；
And for being collimated to the another way weak coherent light for coming from fiber coupler after, export to organism eyes spy
Test arm component；
And exported to computer for the optical signal for coming from fiber coupler to be converted to digital signal, with what is handled
Signal acquisition component；
Described image signal pickup assembly includes：Data image signal for obtaining organism eyes, and export to computer
The high speed camera handled；Picture signal harvester further includes the second speculum and dichroic mirror；Eye imaging through dichroic mirror,
After second speculum to high speed camera, high speed camera is transmitted to computer after image information is converted to data image signal, leads to
It crosses after computer carries out processing and result of calculation to data image signal and is shown on screen for checking eye image；
And for acquiring the light fixture that data image signal provides illumination for high speed camera；
It is described to include with reference to arm component：
The first collimator that weak coherent light all the way for that will come from fiber coupler collimates；
And for by the weak coherent light after first collimator collimates, the first speculum to be input to after carrying out rotation light path scanning
Rotary light path sweep unit；
And the first speculum reflected for the light of rotary light path sweep unit will to be come from；
The rotary light path sweep unit includes：
Rotating body, and it is connected to the rotating body, four right angles reflection trigone with the rotating body synchronous rotary
Mirror；It is all coated with high reflection deielectric-coating on the right-angle side of four right angle reflex prisms, anti-reflection film is coated on bevel edge；Four institutes
The square entirety in a cross section is formed after stating right angle reflex prism assembly；Light beam reflects three from right angle described in one of them
The bevel edge of prism is incident, after being reflected on the plane of incidence, can fall on the right-angle side of the right angle reflex prism, the height on right-angle side
Reflecting medium film reflects light on another right-angle side of the right angle reflex prism, is then reflected back on bevel edge again, finally
Outgoing.
2. the non-cpntact measurement equipment of ocular biometric parameters according to claim 1, which is characterized in that the feeler arm group
Part includes：
The second collimator for collimating the another way weak coherent light for coming from fiber coupler；
And for by the light after the second collimator collimation into line convergence, flat wear or dissipate the liquid optic lens handled.
3. the non-cpntact measurement equipment of ocular biometric parameters according to claim 1, which is characterized in that the signal acquisition
Component includes：
Photoelectric conversion part for the optical signal for coming from fiber coupler to be converted to electric signal；
And for the digital-to-analogue of the accessible digital signal of computer will to be converted to through the transformed electric signal of photoelectric conversion part
Converter.
4. the non-cpntact measurement equipment of ocular biometric parameters according to claim 1, which is characterized in that the weak coherent light
One first Polarization Controller is provided between source and fiber coupler.
5. the non-cpntact measurement equipment of ocular biometric parameters according to claim 1, which is characterized in that the fiber coupling
One second Polarization Controller is provided between device and first collimator.
6. the non-cpntact measurement equipment of ocular biometric parameters according to claim 2, which is characterized in that the fiber coupling
A third Polarization Controller is provided between device and the second collimator.
7. a kind of non-cpntact measurement equipment by the ocular biometric parameters as described in any one of claim 1 to 6 is realized
The non-contact measurement method of ocular biometric parameters, which is characterized in that the non-contact measurement method of the ocular biometric parameters includes：
Weak coherent light source is generated and transmitted by weak coherent light, using as non-contact detection light；
Fiber coupler weak coherent light caused by weak coherent light source be divided into two-way and respectively at refer to arm component and feeler arm
It is handled in component；
With reference to arm component to coming from after weak coherent light collimates all the way of fiber coupler, it is reflected back fiber coupler, together
When detection arm component the another way weak coherent light for coming from fiber coupler is collimated after, output is to organism eyes；
After fiber coupler will be by carrying out optical heterodyne modulation with reference to the reflected light of arm component, output to opto-electronic conversion fills
It sets；
The optical signal for coming from fiber coupler is converted to digital signal and exported to computer by signal acquisition component, to be located
Reason；
Light fixture acquires data image signal for high speed camera and provides illumination, and high speed camera obtains the digitized map of organism eyes
As signal, and exports to computer and handled.
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| CN108426834A (en) * | 2018-05-11 | 2018-08-21 | 佛山科学技术学院 | A kind of quick light path scanning means |
| CN109683311B (en) * | 2019-01-14 | 2021-02-02 | 杭州明视康眼科医院有限公司 | Diopter calculation method for intraocular lens |
| CN111060480A (en) * | 2019-12-27 | 2020-04-24 | 佛山科学技术学院 | Optical coherence tomography scanning device |
| CN113397476B (en) * | 2021-06-16 | 2023-08-22 | 浙大宁波理工学院 | Method for fully automatically measuring eyeball parameters |
| CN115132309B (en) * | 2022-07-06 | 2023-03-24 | 潍坊眼科医院有限责任公司 | Method and device for fitting orthokeratology lens |
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