CN203987986U - Corneal vertex alignment system and axis oculi optical path length measuring system - Google Patents
Corneal vertex alignment system and axis oculi optical path length measuring system Download PDFInfo
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- CN203987986U CN203987986U CN201420260018.0U CN201420260018U CN203987986U CN 203987986 U CN203987986 U CN 203987986U CN 201420260018 U CN201420260018 U CN 201420260018U CN 203987986 U CN203987986 U CN 203987986U
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Abstract
This utility model has been announced corneal vertex alignment system and axis oculi optical path length measuring system.Corneal vertex alignment system comprises: vertical direction cornea position alignment module and horizontal direction cornea position alignment module; Described vertical direction cornea position alignment module is for judging the perpendicular of corneal vertex in eye optical system primary optical axis place; Described horizontal direction cornea position alignment module is for judging the horizontal plane of corneal vertex in eye optical system primary optical axis place.Axis oculi optical path length measuring system comprises: OCT system source, fiber coupler, detection system, control system, sample arm assembly and reference arm assembly, described sample arm assembly comprises the corneal vertex alignment system that is arranged on end.This utility model has been realized the accurate aligning of corneal vertex, and realizes on this basis the accurate measurement of axis oculi optical path length.
Description
Technical field
This utility model belongs to ophthalmology OCT field, is specifically related to a kind of accurate method of aiming at of corneal vertex, system and the method and system employs are measured and ophthalmic medical equipment in axis oculi optical path length.
Background technology
Optical coherent chromatographic imaging (OCT, Optical Coherence Tomography) be a kind of emerging optical image technology, with respect to traditional clinical imaging means, having the advantages such as resolution is high, image taking speed, radiationless damage, moderate cost, compact conformation, is the important potential instrument of basic medical research and clinical diagnostic applications.Current, in multiple optical Ophthalmologic apparatus, become the indispensable Ophthalmologic apparatus of eye disease diagnosis for the OCT device of ophthalmologic examination and treatment.
In a lot of ophthalmic medical instruments, all need to allow instrument light path primary optical axis aim at human eye pupil or corneal vertex.In existing instrument, adopt iris identification to aim at pupil more.But due to the difference of different human eye forms, after pupil center aims at, corneal vertex may not be aimed at system light path primary optical axis.Reason has 2 points: one, human eye optical axis and the optical axis exist certain angle, and the corner dimension difference of different human eyes.In practical operation instrument process, people to be measured stares at a certain solid viewpoint, but this solid viewpoint cannot be used for accurately judging the angle of human eye optical axis and the optical axis.Even if thereby pupil optical system for alignment primary optical axis, but corneal vertex is not often on system light path primary optical axis; Two,, according to iris identification pupil center, after allowing system light path primary optical axis aim at pupil center, due to the difference of human eye's anterior chamber form, now corneal vertex may not be aimed at system light path primary optical axis.
If adopt the measuring method of optics, to accurately measure cornea parameter, as corneal curvature and thickness etc., need to look like to carry out image rectification to the cornea aspect graph gathering, and corneal vertex whether can effect correction in system light path primary optical axis the three-dimensional imaging of accuracy, especially cornea after image rectification.Thereby while measuring eye cornea cross-section image to be measured, need corneal summit accurately to aim at.And tester can only roughly be adjusted to detected person's corneal vertex on system primary optical axis according to iris imaging method, cannot realize the object to system primary optical axis by corneal vertex accurate adjustment.Due to corneal vertex cannot accurate adjustment to the primary optical axis of system, thereby caused the series of parameters relevant with eyes as inaccurate in the test result of people's axis oculi optical path length.
Utility model content
This utility model provides a kind of corneal vertex alignment system, also provides this corneal vertex alignment system is used in to the OCT system of surveying people's axis oculi optical path length, and its object is to solve following defect: (1), corneal vertex cannot accurately be aimed at; (2) the axis oculi optical path length, causing because corneal vertex cannot accurately be aimed at is measured inaccurate.
The technical solution of the utility model:
The system that corneal vertex is aimed at, is characterized in that, comprising: vertical direction cornea position alignment module and horizontal direction cornea position alignment module; Described vertical direction cornea position alignment module is for judging the perpendicular of corneal vertex in eye optical system primary optical axis place; Described horizontal direction cornea position alignment module is for judging the horizontal plane of corneal vertex in eye optical system primary optical axis place.
Further: described vertical direction cornea position alignment module comprises: be arranged on vertical direction alignment light source, vertical direction collecting lens, vertical direction bright dipping diaphragm, vertical direction pinhole plate and the vertical direction luminous lens on bright dipping light path primary optical axis and be arranged on vertical direction receiver lens and the vertical direction optical system for alignment detector on light-receiving optical path primary optical axis; Described horizontal direction cornea position alignment module comprises horizontal direction alignment light source, horizontal direction collecting lens, horizontal direction bright dipping diaphragm, horizontal direction pinhole plate and the horizontal direction luminous lens that is arranged on bright dipping light path primary optical axis and horizontal direction receiver lens and the horizontal direction optical system for alignment detector that is arranged on light-receiving optical path primary optical axis.
Further: described vertical direction cornea position alignment module also comprises the vertical optical filter that is arranged on described vertical receiver lens front end; Described horizontal direction cornea position alignment module also comprises the horizontal optical filter that is arranged on described horizontal receiver lens front end.
An OCT system of surveying people's axis oculi optical path length, comprising: OCT system source, fiber coupler, detection system, control system, sample arm assembly and reference arm assembly, described OCT system source provides incident illumination to described sample arm assembly and described reference arm assembly respectively through fiber coupler, wherein be incident to human eye optical fundus through the incident illumination of described sample arm assembly and through human eye fundus reflex, the light reflecting interferes described fiber coupler with the light reflecting from described reference arm assembly after described sample arm assembly, described interference light is detected system and detects, after control system is processed, obtain the OCT fault imaging of human eye, it is characterized in that: described sample arm assembly comprises the corneal vertex alignment system that is arranged on end, described corneal vertex alignment system comprises described vertical direction cornea position alignment module and described horizontal direction cornea position alignment module.
Further, described sample arm assembly is also included in and sets gradually in light path: Polarization Controller, light modulation journey module, directions X scanning means, Y-direction scanning means and diopter adjusting mirror and connect order object lens; Wherein, described Polarization Controller is adjacent with described fiber coupler.
The beneficial effects of the utility model: (1), utilize vertical direction cornea position alignment module and horizontal direction cornea position alignment module that corneal vertex is adjusted to the operating position that system arranges accurately, thus arrive the object that corneal vertex is accurately aimed at; (2), cornea alignment system is applied in the OCT system of surveying people axis oculi optical length, can realize OCT system and accurately measure the object of people's axis oculi optical path length.
figure of description
Fig. 1 is the schematic flow sheet of corneal vertex alignment methods;
Fig. 2 is the OCT system light path figure that includes the survey people axis oculi optical path length of corneal vertex alignment system 500;
Fig. 3 is vertical direction cornea position alignment module 200 index paths;
Fig. 4 is horizontal direction cornea position alignment module 300 index paths;
Fig. 5 is the schematic diagram that corneal vertex Ec that the receiving plane 208a of vertical direction optical system for alignment detector 208 obtains departs from the perpendicular at eye optical system primary optical axis place;
Fig. 6 is the schematic diagram of the perpendicular of the corneal vertex Ec that obtains of the receiving plane 208a of vertical direction optical system for alignment detector 208 in eye optical system primary optical axis place;
Fig. 7 is the schematic diagram that corneal vertex Ec that the receiving plane 308a of horizontal direction optical system for alignment detector 308 obtains departs from the horizontal plane at eye optical system primary optical axis place;
Fig. 8 is the schematic diagram of the horizontal plane of the corneal vertex Ec that obtains of the receiving plane 308a of horizontal direction optical system for alignment detector 308 in eye optical system primary optical axis place;
Fig. 9 is that axis oculi optical path length calculates schematic diagram.
In figure, each sequence number and corresponding title are respectively:
E, sample (human eye)
Ec, corneal vertex
101, OCT system source
102, fiber coupler
103, Polarization Controller
1050, reference arm assembly
104, reference arm light Reuter mirror
105, reference arm reflecting mirror
106, detection system
107, control system
108, sample arm light path focusing lens
1080, light modulation journey module
109, directions X light path scanning means
110, Y-direction light path scanning means
111, diopter adjusting mirror
112, connect order object lens
500, corneal vertex alignment system
200, vertical direction cornea position alignment module
201, vertical direction alignment light source
202, vertical direction collecting lens
203, vertical direction bright dipping diaphragm
204, vertical direction pinhole plate
205, vertical direction luminous lens
206, vertical direction optical filter
207, vertical direction receiver lens
208, vertical direction optical system for alignment detector
The receiving plane of 208a, vertical direction optical system for alignment detector 208
300, horizontal direction cornea position alignment module
301, horizontal direction alignment light source
302, horizontal direction collecting lens
303, horizontal direction bright dipping diaphragm
304, horizontal direction pinhole plate
305, horizontal direction luminous lens
306, horizontal direction optical filter
307, horizontal direction receiver lens
308, horizontal direction optical system for alignment detector
The receiving plane of 308a, horizontal direction optical system for alignment detector 308
400, sample arm assembly
Detailed description of the invention
In order to make technical problem to be solved in the utility model, technical scheme and beneficial effect clearer, below in conjunction with drawings and Examples, this utility model is further elaborated.Should be appreciated that specific embodiment described herein is only in order to explain this utility model, and be not used in restriction this utility model.
(1), corneal vertex alignment methods
With reference to figure 1, Fig. 1 is the schematic flow sheet of cornea alignment methods, comprises the steps:
S101: judge the perpendicular of corneal vertex in eye optical system primary optical axis place and judge the horizontal plane of corneal vertex in eye optical system primary optical axis place according to horizontal direction cornea position alignment module according to vertical direction cornea position alignment module, determine that corneal vertex is on eye optical system primary optical axis;
S102: front or the rear of the operating position in eye optical system setting according to described vertical direction cornea position alignment module or described horizontal direction cornea position alignment module judgement corneal vertex;
S103: described corneal vertex is moved to described operating position by control system.
Particularly, for step S101, with reference to figure 2, vertical direction cornea position alignment module 200 judges that corneal vertex Ec is whether on the perpendicular in eye optical system primary optical axis place, and horizontal direction cornea position alignment module 300 can only judge that corneal vertex Ec is whether on the horizontal plane in eye optical system primary optical axis place.Because know from light path principle, cannot be only judge that from vertical direction cornea position alignment module 200 corneal vertex Ec is whether in eye optical system primary optical axis, simultaneously also cannot be only judge that from horizontal direction cornea position alignment module 300 corneal vertex Ec is whether in eye optical system primary optical axis; Therefore only have satisfied both perpendiculars in eye optical system primary optical axis place as corneal vertex Ec, on the horizontal plane in eye optical system primary optical axis place, could judge that corneal vertex is on eye optical system primary optical axis again.In this utility model, bright dipping light path primary optical axis and the light-receiving optical path primary optical axis of vertical direction cornea position alignment module 200 intersect at the first joint and form perpendicular; Bright dipping light path primary optical axis and the light-receiving optical path primary optical axis of horizontal direction cornea position alignment module 300 intersect at the second joint and form horizontal plane.
Lower mask body is set forth the formation of vertical direction cornea position alignment module 200 and horizontal direction cornea position alignment module 300.
Fig. 3 is vertical direction cornea position alignment module 200 index paths.Be arranged on light that the vertical direction alignment light source 201 on the bright dipping light path primary optical axis of vertical direction cornea position alignment module 200 sends through vertical direction collecting lens 202, after vertical direction bright dipping diaphragm 203, focus on vertical direction pinhole plate 204, this light focuses on corneal vertex Ec through the Kong Houzai of vertical direction pinhole plate 204 through after vertical direction luminous lens 205, after corneal vertex Ec reflection, light beam passes through the vertical direction receiver lens 207 on the light-receiving optical path primary optical axis that is arranged on vertical direction cornea position alignment module 200, converge on vertical direction optical system for alignment detector 208.Bright dipping light path primary optical axis and the light-receiving optical path primary optical axis of vertical direction cornea position alignment module 200 are intersected in the first joint A1.
Further, on the bright dipping light path primary optical axis of vertical direction cornea position alignment module 200, be also provided with vertical direction optical filter 206, it is between the first joint A1 and vertical direction receiver lens 207, namely at the incident end place of vertical direction receiver lens 207.The effect of vertical direction optical filter 206 is for crossing other veiling glares beyond filtering vertical direction alignment light source 201, the light only sending by vertical direction alignment light source 201.
Further, vertical direction optical system for alignment detector 208 is at least the one in position sensor dough-making powder battle array detection array, certainly, meets the optical system for alignment detector of service condition for other, also at the row of this utility model protection.
Fig. 4 is the index path of horizontal direction cornea position alignment module 300.Be arranged on light that the horizontal direction alignment light source 301 on the bright dipping light path primary optical axis of horizontal direction cornea position alignment module 300 sends after horizontal direction collecting lens 302, horizontal direction bright dipping diaphragm 303, focus on horizontal direction pinhole plate 304, this light is through focusing on corneal vertex Ec through after horizontal direction luminous lens 305 again after the hole portion of horizontal direction pinhole plate 304.After corneal vertex Ec reflection, the horizontal direction receiver lens 307 on the light-receiving optical path primary optical axis of light beam through being arranged on horizontal direction cornea position alignment module 300, converges on horizontal direction optical system for alignment detector 308.Bright dipping light path primary optical axis and light-receiving optical path primary optical axis are intersected in the second joint A2.
Further, horizontal direction cornea position alignment module 300 on bright dipping light path primary optical axis, be also provided with horizontal direction optical filter 306, it is between the second joint A2 and horizontal direction receiver lens 307, the namely incident end place of receiver lens 307 in the horizontal direction, for filtering except horizontal direction alignment light source 301 other veiling glares, the light only sending by horizontal direction alignment light source 301.
Further, horizontal direction optical system for alignment detector 308 is at least the one in position sensor, face battle array detection array.Certainly, meet the optical system for alignment detector of service condition for other, also at the row of this utility model protection.
Further, the first joint A1 and the second joint A2 are arranged to overlap.
In this utility model, bright dipping light path primary optical axis and the light-receiving optical path primary optical axis of horizontal direction cornea position alignment module 300 form described horizontal plane, and the definition of this horizontal plane is applicable in full; The bright dipping light path primary optical axis of vertical direction cornea position alignment module 200 and light-receiving optical path primary optical axis form perpendicular, and the definition of this perpendicular is applicable in full.
With reference to figure 5 and Fig. 6.Fig. 5 is the schematic diagram that corneal vertex Ec that the receiving plane 208a of vertical direction optical system for alignment detector 208 obtains departs from the perpendicular at eye optical system primary optical axis place.In Fig. 5, L208a is the vertical centrage of the receiving plane 208a of vertical direction optical system for alignment detector 208, and L208b is the horizontal center line of the receiving plane 208a of vertical direction optical system for alignment detector 208.In Fig. 5, the first hot spot 204a is not upper in L208a, represents that corneal vertex Ec has departed from the perpendicular at eye optical system primary optical axis place.In Fig. 6, the first hot spot 204a is upper in L208a, can judge accordingly the perpendicular of corneal vertex Ec in eye optical system primary optical axis place.But, can only judge the whether perpendicular in eye optical system primary optical axis place of corneal vertex Ec according to Fig. 5 and Fig. 6, but whether on eye optical system primary optical axis, cannot judge separately.Further, with reference to figure 3, Fig. 5 and Fig. 6, the center o208 of the receiving plane 208a of vertical direction optical system for alignment detector 208 and the first joint A1 are with respect to vertical direction receiver lens 207 conjugation, and the first joint A1 and vertical direction pinhole plate 204 are with respect to vertical direction luminous lens 205 conjugation.
With reference to figure 7 and Fig. 8.Fig. 7 is the schematic diagram that corneal vertex Ec that the receiving plane 308a of horizontal direction optical system for alignment detector 308 obtains departs from the horizontal plane at eye optical system primary optical axis place.In Fig. 7, L308a is the vertical centrage of the receiving plane 308a of horizontal direction optical system for alignment detector 308, and L308b is the receiving plane 308a horizontal center line of horizontal direction optical system for alignment detector 308.In Fig. 7, the second hot spot 304a is not upper in L308b, represents that corneal vertex Ec departs from the horizontal plane at eye optical system primary optical axis place.In Fig. 8, the second hot spot 304a is upper in L308b, therefore can judge the horizontal plane of corneal vertex Ec in eye optical system primary optical axis place.Further, with reference to figure 4, Fig. 7 and Fig. 8, the center o308 of the receiving plane 308a of horizontal direction optical system for alignment detector 308 and the second joint A2 are with respect to horizontal direction receiver lens 307 conjugation, and the second joint A2 and horizontal direction pinhole plate 204 are with respect to horizontal direction luminous lens 305 conjugation.Can only judge the whether horizontal plane in eye optical system primary optical axis place of corneal vertex according to Fig. 7 and Fig. 8, but whether on eye optical system primary optical axis, cannot judge separately.
In sum, cannot judge that corneal vertex Ec is whether on the primary optical axis in eye optical system place according to vertical direction cornea position alignment module 200, also cannot judge that corneal vertex Ec is whether on the primary optical axis in eye optical system place according to horizontal direction cornea position alignment module 300.Only have comprehensive vertical direction cornea position alignment module 200 and horizontal direction cornea position alignment module 300, could judge that corneal vertex Ec is whether on system primary optical axis.
Step S101 can only judge that corneal vertex Ec is whether on the primary optical axis in eye optical system, but now can't determine on the operating position whether corneal vertex Ec arrange in system, therefore needs to perform step S102.With reference to figure 4 and Fig. 5, said operating position refers to the bright dipping light path primary optical axis of vertical direction cornea position alignment module 200 and the first joint A1 or the bright dipping light path primary optical axis of horizontal direction cornea position alignment module 300 and the second joint A2 that light-receiving optical path primary optical axis crosses that light-receiving optical path primary optical axis crosses herein.
Step S102: front or the rear of the operating position in system setting according to described vertical direction cornea position alignment module or described horizontal direction cornea position alignment module judgement corneal vertex.Due in step S101, utilize vertical direction cornea position alignment module 200 and horizontal direction cornea position alignment module 300 corneal vertex Ec to be adjusted to the primary optical axis of eye optical system, therefore in step S102, only need to judge front or the rear of the operating position of corneal vertex Ec in system setting.
The concrete decision method of step S102 is as follows.
With reference to figure 6 and in conjunction with Fig. 2 and Fig. 3.In Fig. 6, the upper portion of the vertical centre line L 208a of the receiving plane 208a of the first hot spot 204a in vertical direction optical system for alignment detector 208, illustrate corneal vertex Ec from connect order object lens 112 excessively close to, corneal vertex Ec is positioned at rear, operating position.Depart from the center O 208 of vertical direction optical system for alignment detector 208 in the first hot spot 204a of the described vertical centre line L 208a first half in addition far away; illustrate described corneal vertex Ec be positioned at rear, operating position and depart from far away, corneal vertex Ec from connect order object lens 112 more close to; The Lower Half of the vertical centre line L 208a of the first hot spot 204a in vertical direction optical system for alignment detector 208, illustrate corneal vertex Ec from connect order object lens 112 excessively away from, corneal vertex Ec is positioned at front, operating position.It is far away that the first hot spot 204a of the Lower Half of the vertical centre line L 208a in vertical direction optical system for alignment detector 208 departs from vertical direction optical system for alignment detector 208 center in addition, illustrate described corneal vertex Ec be positioned at front, operating position and depart from far away, corneal vertex Ec from connect order object lens 112 more away from.
The left half part of the horizontal center line L308b of receiving plane 308a with reference to figure 8, the second hot spot 304a in horizontal direction optical system for alignment detector 308, illustrate corneal vertex Ec from connect order object lens 112 excessively away from, corneal vertex Ec is positioned at front, operating position.To depart from the center O 308 of horizontal direction optical system for alignment detector 308 far away for the second hot spot 304a of the left side of the horizontal center line L308b of the receiving plane 308a in horizontal direction optical system for alignment detector 308 in addition; illustrate corneal vertex Ec be positioned at front, operating position and depart from far away, corneal vertex Ec from connect order object lens 112 more away from; The right-hand part of the horizontal center line L308b of the second hot spot 304a in horizontal direction optical system for alignment detector 308, illustrate corneal vertex Ec from connect order object lens 112 excessively close to, corneal vertex Ec is positioned at rear, operating position.To depart from the center O 308 of horizontal direction optical system for alignment detector 308 far away for the second hot spot 304a of the right-hand part of the horizontal center line L308b of horizontal direction optical system for alignment detector 308 in addition, illustrate corneal vertex Ec be positioned at rear, operating position and depart from far away, corneal vertex Ec from connect order object lens 112 more close to.
It should be noted that, above said corneal vertex Ec be positioned at front, described operating position refer to corneal vertex Ec from horizontal direction cornea position alignment module 300 or vertical direction cornea position alignment module 200 excessively away from, human eye need be to 200 of horizontal direction cornea position alignment module 300 or vertical direction cornea position alignment moulds near corneal vertex Ec being moved to described operating position; Corneal vertex Ec be positioned at rear, operating position refer to corneal vertex Ec from horizontal direction cornea position alignment module 300 or vertical direction cornea position alignment module 200 excessively close to, human eye need could move to operating position by corneal vertex Ec away from horizontal direction cornea position alignment module 300 or vertical direction cornea position alignment module 200.
Comprehensive judgement above, according to vertical direction cornea position alignment module 200 or horizontal direction cornea position alignment module 300, can judge front or the rear of the operating position that corneal vertex Ec arranges along the system that is positioned on the primary optical axis of eye optical system.It should be noted that, the operating position herein referring to is the first joint A1 or the second joint A2.
Step S103: described corneal vertex is moved to described operating position by control system.
Step S101 has judged the primary optical axis of corneal vertex Ec in eye optical system; Step S102 judges that corneal vertex Ec is positioned at front or the rear of the operating position of system setting, and also can draw in the lump apart from the distance of operating position; Experiencing after step S101 and S102, the realization of step S103 is to see Fig. 2 by handling Quality control arm component 400() upper and lower, left and right and front and back corneal vertex Ec is moved on to operating position, by corneal vertex Ec with the first joint A1 overlaps or corneal vertex Ec and the second joint A2 overlap.Particularly, system according to before described corneal vertex alignment principles regulate upper and lower, left and right and the front and back of sample arm assembly 400, corneal vertex Ec is adjusted to the first joint A1 or the second joint A2.In the time of the front and back of system Quality control arm component 400, can change the light path of sample arm assembly 400 to optical fundus Er, thereby system can Synchronization Control light modulation journey module 1080 movement compensate the change of the light path of sample arm assembly 400, remain from fiber coupler 102 to human eye optical fundus Er with to reference arm reflecting mirror 105 aplanatisms, thereby obtain all the time the OCT image on optical fundus.Once system Quality control arm component 400, when corneal vertex Ec is adjusted to the first joint A1 or the second joint A2, system just can determine which width optical fundus OCT image current gathered be.Then system just can stop the judgement work of collection and corneal vertex.Again from corneal vertex Ec be adjusted to operating position when the first joint A1 or the second joint A2 corresponding optical fundus OCT image record axis oculi optical path length according to described people's axis oculi light path value calculating method.
Further, before step S101 carries out, also comprise the steps:
S201: regulate pupil center location according to iris imaging system, described pupil center location is roughly adjusted on system primary optical axis;
Near S202: regulate probe front and back position, iris is looked like to be adjusted to more clear level, now judge the operating position of described corneal vertex in described system setting.
The object of S201 and S202 is the rough adjustment on corneal summit, for the accurate adjustment of corneal vertex in step S101-step S103 is below prepared.
Particularly, the realization of " iris is looked like to be adjusted to more clear level " in step S202 is regulate all around of sample arm assembly and move up and down described in artificial or control system control, described corneal vertex is moved near the operating position of described system setting.
This two step and step S101-step S103, realized by corneal vertex Ec accurate adjustment to specify operating position, realized the accurate aligning of corneal vertex Ec, for the collection of optical fundus OCT image provides the foundation.
When corneal vertex Ec realizes after accurate aligning, now control system 107 allows the OCT system of surveying people's axis oculi optical path length start acquired signal.By light modulation journey module, 1080(is shown in Fig. 2) movement, change the light path of sample arm assembly 400, make light path from fiber coupler 102 to optical fundus Er and mate to the light path of reference arm reflecting mirror 105, thereby obtain the OCT image on optical fundus.
System also can allow the position of reference arm reflecting mirror 105 move to change light path, and if so, sample arm light path focusing lens 108 is just without movement.
(2), corneal vertex alignment system
With reference to figure 2, this utility model has also been announced corneal vertex alignment system 500, comprises vertical direction cornea position alignment module 200, horizontal direction cornea position alignment module 300.Wherein, the bright dipping light path primary optical axis of horizontal direction cornea position alignment module 300 and light-receiving optical path primary optical axis form horizontal plane; The bright dipping light path primary optical axis of vertical direction cornea position alignment module 200 and light-receiving optical path primary optical axis form perpendicular.The intersection of described horizontal plane and perpendicular is eye optical system primary optical axis.
Further, with reference to figure 3, vertical direction cornea position alignment module 200 comprises: be arranged on vertical direction alignment light source 201, vertical direction collecting lens 202, vertical direction bright dipping diaphragm 203, vertical direction pinhole plate 204 and the vertical direction luminous lens 205 on bright dipping light path primary optical axis and be arranged on vertical direction receiver lens 207 and the vertical direction optical system for alignment detector 208 on light-receiving optical path primary optical axis; Horizontal direction cornea position alignment module 300 comprises horizontal direction alignment light source 301, horizontal direction collecting lens 302, horizontal direction bright dipping diaphragm 303, horizontal direction pinhole plate 304 and the horizontal direction luminous lens 305 that is arranged on bright dipping light path primary optical axis and horizontal direction receiver lens 307 and the horizontal direction optical system for alignment detector 308 that is arranged on light-receiving optical path primary optical axis.Vertical direction cornea position alignment module 200 with aforementioned the same, is not done tired state at this with the function of horizontal direction cornea position alignment module 300.
Further, with reference to figure 4, vertical direction cornea position alignment module 200 also comprises the vertical optical filter 206 that is arranged on described vertical direction receiver lens 207 front ends; Horizontal direction cornea position alignment module 300 also comprises the horizontal optical filter 306 that is arranged on described horizontal direction receiver lens 307 front ends.Vertically optical filter 206 and the effect of horizontal optical filter 306 with front chat equally, do not do to tire out at this and state.
Further, with reference to figure 3, Fig. 4, Fig. 5-Fig. 8, the center o208 of the receiving plane 208a of described vertical direction optical system for alignment detector 208 and the first joint A1 are with respect to vertical direction receiver lens 207 conjugation, and the first joint A1 and described vertical direction pinhole plate 204 are with respect to vertical direction luminous lens 205 conjugation; The center O 308 of the receiving plane 308a of described horizontal direction optical system for alignment detector 308 and the second joint A2 are with respect to horizontal direction receiver lens 307 conjugation, and the second joint A2 and horizontal direction pinhole plate 304 are with respect to horizontal direction luminous lens 305 conjugation.It should be noted that, the function at the receiving plane 208a of vertical direction optical system for alignment detector 208 and the center of the receiving plane 308a of horizontal direction optical system for alignment detector 308 with front chat equally, do not do tired stating at this.
The system that corneal vertex is aimed at can realize aims at the operating position of corneal vertex Ec and setting, for the accurate measurement of people's axis oculi light path value provides guarantee.
(3), survey the OCT system of people's axis oculi optical path length
With reference to figure 2, Fig. 2 is the index path of surveying the OCT system of people's axis oculi optical path length, comprise: OCT system source 101, fiber coupler 102, reference arm assembly 1050, detection system 106, control system 107 and sample arm assembly 400, this sample arm assembly 400 comprises corneal vertex alignment system 500.The light that OCT system source 101 is exported provides light to sample arm assembly 400 and reference arm assembly 1050 respectively through fiber coupler 102.Provide light through sample arm assembly 400Na road light to tested human eye optical fundus Er, the light of returning from optical fundus Er scattering interferes fiber coupler 102 with the light reflecting from reference arm assembly 1050 after sample arm assembly 400, interference light is detected system 106 and detects, process through control system 107 again, finally demonstrate the OCT image of sample.Wherein corneal vertex alignment system 500 comprises vertical direction cornea position alignment module 200, horizontal direction cornea position alignment module 300.Corneal vertex Ec is adjusted to the operating position that system arranges, i.e. foregoing the first joint A1 or the second joint A2 by corneal vertex alignment system 500.Because the OCT system of this survey people axis oculi optical path length has comprised vertical direction cornea position alignment module 200 and horizontal direction cornea position alignment module 300, provide an important prerequisite for realizing survey people axis oculi optical path length, that is exactly that corneal vertex Ec must adjust to the operating position that system arranges accurately.
Further, sample arm assembly 400 also comprises the Polarization Controller 103, light modulation journey module 108, directions X light path scanning means 109, Y-direction light path scanning means 110 and the diopter adjusting mirror 111 that are successively set in light path.Polarization Controller 103 arranges near fiber coupler 102, and diopter adjusting mirror 111 arranges near connecing order object lens 112.
The axis oculi optical path length difference of different human eyes in addition, for realizing the coherent measurement of OCT system, system reference arm is fixed, now need in sample arm light path, introduce light path regulatory mechanism.Native system adopts the adjustable scheme of spacing allowing between sample arm light path focusing lens 108 and directions X scanning means 109, meets the needs that different people axis oculi optical path length is surveyed, and adjusts the position of light modulation journey module 1080 and realizes.In addition, adjust light modulation journey module 1080 and also comprise sample arm optical fiber head (not shown), the position of it and sample arm light path focusing lens 108 is changeless, that is to say, adjust light modulation journey module 1080 in the process of change light path, sample arm light path focusing lens 108 and sample arm optical fiber head are to do as a whole movement, and relative position between them remains unchanged.
(4), the measurement of axis oculi optical path length
When the method and system that utilizes aforementioned said corneal vertex to aim at is adjusted to corneal vertex Ec behind OCT system assigned work position, the data of the axis oculi optical path length recording are more accurate.Concrete, the relevant parameter that axis oculi optical path length is measured is with reference to figure 9 and in conjunction with Fig. 2 and Fig. 3.When light modulation journey module 1080 is during in reset position (not shown), the relevant original position such as grade of system reference arm is positioned at RDK1 place.Wherein RDK1 place characterizes when system sample arm light modulation journey module 1080 is during in reset position, the corresponding locus of image apex of OCT system scan imaging, and RDK1 with can be obtained by system calibrating in the distance L RDK1toEc of the eye cornea summit of operating distance Ec.
In the time measuring measured optical fundus OCT image, due to the difference of human eye axis oculi optical path length, tester's controllable adjustable light modulation journey module 1080 obtains optical fundus OCT image.For example, while surveying optical fundus OCT image, light modulation journey module 1080 is the distance near S to directions X light path scanning means 109.Now OCT system scan imaging region is to the light path at human eye rear also mobile S.In Fig. 9, scanning area top moves to RDK2 from RDK1.It should be noted that, the OCT measuring range of 2 rectangle frame sign different parts in Fig. 9, rectangle frame is the signal region of scanning just, and physical scan area can be the shapes such as fan-shaped, does not limit at this.
Particularly, the measuring process of people's axis oculi optical path length LEye is as follows:
S301: utilize described vertical direction cornea position alignment module and described horizontal direction cornea position alignment module that corneal vertex is accurately registered on the primary optical axis of OCT system, and the operating position that described corneal vertex is arranged in system;
The concrete regulating step of S301 and effect have been set forth above, no longer speak more at this.
S302: according to formula LEye=LRDK1toEc+S+hRetinal, record people's axis oculi optical path length LEye;
Wherein: described operating position refers to the bright dipping light path primary optical axis of described vertical direction cornea position alignment module and the first joint or the bright dipping light path primary optical axis of described horizontal direction cornea position alignment module and the second joint that light-receiving optical path primary optical axis crosses that light-receiving optical path primary optical axis crosses.
Wherein, hRetinal is the light path of the corresponding locus of retina OCT image apex to measured's macula retinae central fovea, and this value can be by obtaining in the oculi posterior segment OCT image of gained.LRDK1toEc characterizes RDK1 and the distance in the eye cornea summit of operating distance Ec, is the given value of system calibrating.And the amount of movement S of light modulation journey assembly 1080 can measure by motor removing step size computation, or obtain by a kind of subsidiary in magnetic railings ruler, grating scale, appearance grid chi.Above-mentioned formula LEye=LRDK1toEc+S+hRetinal has just reflected human eye axial length light path value, but and the actual physiology axial length of human eye can be obtained divided by human eye equivalence mean refractive index by LEye.
Further, with reference to figure 2, light modulation journey assembly 1080 comprises driving device (not shown) and is driven the sample arm light path focusing lens 108 and the sample arm optical fiber head (not shown) that are synchronized with the movement by driving device.Measure people's axis oculi optical path length by the corneal vertex alignment system that utilizes vertical direction cornea position alignment module 200 and horizontal direction cornea position alignment module 300, improved the accuracy of test result.
It should be noted that, described the first joint A1 and the second joint A2 describe in the preceding article, are not repeated at this.
The foregoing is only preferred embodiment of the present utility model; not in order to limit this utility model; all any amendments of doing within spirit of the present utility model and principle, be equal to and replace and improvement etc., within all should being included in protection domain of the present utility model.
Claims (5)
1. a corneal vertex alignment system, is characterized in that, comprising: vertical direction cornea position alignment module and horizontal direction cornea position alignment module; Described vertical direction cornea position alignment module is for judging the perpendicular of corneal vertex in eye optical system primary optical axis place; Described horizontal direction cornea position alignment module is for judging the horizontal plane of corneal vertex in eye optical system primary optical axis place.
2. corneal vertex alignment system as claimed in claim 1, is characterized in that: described vertical direction cornea position alignment module comprises: be arranged on vertical direction alignment light source, vertical direction collecting lens, vertical direction bright dipping diaphragm, vertical direction pinhole plate and the vertical direction luminous lens on bright dipping light path primary optical axis and be arranged on vertical direction receiver lens and the vertical direction optical system for alignment detector on light-receiving optical path primary optical axis; Described horizontal direction cornea position alignment module comprises horizontal direction alignment light source, horizontal direction collecting lens, horizontal direction bright dipping diaphragm, horizontal direction pinhole plate and the horizontal direction luminous lens that is arranged on bright dipping light path primary optical axis and horizontal direction receiver lens and the horizontal direction optical system for alignment detector that is arranged on light-receiving optical path primary optical axis.
3. corneal vertex alignment system as claimed in claim 2, is characterized in that: described vertical direction cornea position alignment module also comprises the vertical optical filter that is arranged on described vertical receiver lens front end; Described horizontal direction cornea position alignment module also comprises the horizontal optical filter that is arranged on described horizontal receiver lens front end.
4. people's axis oculi optical path length measuring system, comprising: OCT system source, fiber coupler, detection system, control system, sample arm assembly and reference arm assembly, described OCT system source provides incident illumination to described sample arm assembly and described reference arm assembly respectively through fiber coupler, wherein be incident to human eye optical fundus through the incident illumination of described sample arm assembly and through human eye fundus reflex, the light reflecting interferes described fiber coupler with the light reflecting from described reference arm assembly after described sample arm assembly, described interference light is detected system and detects, after control system is processed, obtain the OCT fault imaging of human eye, it is characterized in that: described sample arm assembly comprises the corneal vertex alignment system that is arranged on end, described corneal vertex alignment system comprises described vertical direction cornea position alignment module and described horizontal direction cornea position alignment module.
5. people's axis oculi optical path length measuring system as claimed in claim 4, it is characterized in that, described sample arm assembly is also included in and sets gradually in light path: Polarization Controller, light modulation journey module, directions X scanning means, Y-direction scanning means and diopter adjusting mirror and connect order object lens; Wherein, described Polarization Controller is adjacent with described fiber coupler.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103976708A (en) * | 2014-05-20 | 2014-08-13 | 深圳市莫廷影像技术有限公司 | Corneal vertex alignment method and system, and eye axis optical path length measurement method and system |
| CN104490362A (en) * | 2014-12-19 | 2015-04-08 | 上海电力学院 | High-transverse-resolution optical coherence chromatography system based on photon nanometer spraying |
| CN106923784A (en) * | 2017-02-15 | 2017-07-07 | 上海新眼光医疗器械股份有限公司 | Human eye parameter measurement system |
| CN109489544A (en) * | 2018-10-24 | 2019-03-19 | 江苏度微光学科技有限公司 | Super-resolution optical coherent chromatography method and system based on optical microstructures |
| CN109691972A (en) * | 2018-12-29 | 2019-04-30 | 佛山科学技术学院 | Anterior corneal surface optical path difference measurement device and the method for measuring corneal thickness and refractive index |
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2014
- 2014-05-20 CN CN201420260018.0U patent/CN203987986U/en not_active Expired - Lifetime
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103976708A (en) * | 2014-05-20 | 2014-08-13 | 深圳市莫廷影像技术有限公司 | Corneal vertex alignment method and system, and eye axis optical path length measurement method and system |
| CN103976708B (en) * | 2014-05-20 | 2016-08-17 | 深圳市莫廷影像技术有限公司 | Corneal vertex alignment methods and system and axis oculi optical path length measuring method and system |
| CN104490362A (en) * | 2014-12-19 | 2015-04-08 | 上海电力学院 | High-transverse-resolution optical coherence chromatography system based on photon nanometer spraying |
| CN106923784A (en) * | 2017-02-15 | 2017-07-07 | 上海新眼光医疗器械股份有限公司 | Human eye parameter measurement system |
| CN109489544A (en) * | 2018-10-24 | 2019-03-19 | 江苏度微光学科技有限公司 | Super-resolution optical coherent chromatography method and system based on optical microstructures |
| CN109691972A (en) * | 2018-12-29 | 2019-04-30 | 佛山科学技术学院 | Anterior corneal surface optical path difference measurement device and the method for measuring corneal thickness and refractive index |
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