CN105748172B - Artificial cornea mirror post optical performance detector - Google Patents
Artificial cornea mirror post optical performance detector Download PDFInfo
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- CN105748172B CN105748172B CN201610099749.5A CN201610099749A CN105748172B CN 105748172 B CN105748172 B CN 105748172B CN 201610099749 A CN201610099749 A CN 201610099749A CN 105748172 B CN105748172 B CN 105748172B
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/14—Eye parts, e.g. lenses, corneal implants; Implanting instruments specially adapted therefor; Artificial eyes
- A61F2/142—Cornea, e.g. artificial corneae, keratoprostheses or corneal implants for repair of defective corneal tissue
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Abstract
The invention provides a kind of artificial cornea mirror post optical performance detector, including：Light source, expansion optical assembly, measurement plate, parallel optical assembly and measurement assembly；Light source, expansion optical assembly, measurement plate, parallel optical assembly, simulated eye and measurement assembly are set gradually along the direction that light beam irradiates, and measurement plate is arranged on the focal plane of parallel optical assembly；Simulated eye is used to install mirror post；Expand the diameter for the light beam that optical assembly is used to expand and source of parallel light is sent, and collimated light beam is radiated in measurement plate；Parallel optical assembly is used for collimated light beam, and the light beam of collimation is irradiated on the mirror post on simulated eye；Measurement plate and measurement assembly coordinate the optical property for measuring mirror post.Using said structure, doctor can be made to detect the optical property of artificial cornea mirror post to be mounted before surgery, so as to judge whether the mirror post meets the demand of patient；If not meeting, the mirror post can be modified in advance, avoiding problems the pain of patient experience Repeated Operation.
Description
Technical field
The present invention relates to the technical field of optical property detection, detected more particularly, to artificial cornea mirror post optical property
Instrument.
Background technology
Artificial cornea is the product for the similar human cornea that medical macromolecular materials are made, and artificial cornea generally comprises mirror post
With support two parts, wherein, mirror post is made of the stable transparent material of excellent optical characteristics, physicochemical properties, to for
For the muddy cornea that eyeball optics path is hindered after lesion；The major optical performance of mirror post includes focal power and resolution ratio.
Patient is after artificial cornea is installed, and the quality of the optical property of mirror post largely determines its visual performance
Quality, therefore, before being performed the operation, it is necessary to which focal power and resolution ratio to the mirror post of artificial cornea detect, from
And can verify mirror post to be installed meet the demand of patient.
The content of the invention
It is an object of the invention to provide artificial cornea mirror post optical performance detector, to solve present in prior art
, it is necessary to detect the technical problem of mirror post optical property before artificial cornea is installed.
A kind of artificial cornea mirror post optical performance detector that the present invention is provided, including：Light source, expand optical assembly, measurement plate,
Parallel optical assembly, simulated eye and measurement assembly；The light source, the expansion optical assembly, the measurement plate, the parallel optical assembly and
The measurement assembly is set gradually along the direction that light beam irradiates, and the measurement plate is arranged on the focal plane of the parallel optical assembly
On；The simulated eye is used to install mirror post；
It is described to expand the diameter that optical assembly is used to expand the light beam sent with the parallel light source, and collimated light beam is radiated at
In the measurement plate；The parallel optical assembly is used for collimated light beam, and the light beam of collimation is irradiated to installed in the simulated eye
On mirror post on；The measurement plate and the measurement assembly coordinate the optical property for measuring mirror post.
Further, the expansion optical assembly includes expanding portion and parallel portion；The portion of expanding is arranged on the light source and described
Between parallel portion, the diameter for expanded light beam；The parallel portion is used to diverging light becoming directional light, and by parallel light irradiation
In the measurement plate.
Further, the portion of expanding is beam expanding lens, and the parallel portion is preset lens.
Further, the parallel optical assembly includes collimating mirror, and the collimating mirror is used for parallel and collimated ray, the measurement
Plate is arranged on the focal plane of the collimating mirror.
Further, the measurement assembly includes micro eyepiece and microcobjective, and the microcobjective is arranged on the collimation
Between mirror and the micro eyepiece, the microcobjective is used to amplifying picture in the measurement plate, and described in picture be presented on
Inside micro eyepiece, the micro eyepiece is used to measure and reading.
Further, the measurement plate is resolving power test target or glass sieve plate.
Further, polarizer is provided with the direction that light beam irradiates, the polarizer can be filtered via the light source
The light beam irradiated.
Further, in addition to support, the light source, the expansion optical assembly, the parallel optical assembly and the measurement assembly
It is respectively provided with the bracket.
Further, the support includes base and multiple clampers, and multiple clampers are arranged on the base,
And can be slided on the base；Each clamper is respectively used to fix the light source, the expansion optical assembly, described flat
Row optical assembly, the simulated eye and the measurement assembly.
Further, it is provided with scale along along the length direction of the base.
Compared with prior art, the device have the advantages that being：
The artificial cornea mirror post optical performance detector that the present invention is provided, which can be such that doctor detects before surgery, to be installed
Artificial cornea mirror post optical property, and by mirror post be arranged on simulated eye on detect its optical property so that detection knot
Fruit more conforms to the objective circumstances of human eye, accurate reference is provided to doctor, to judge whether the mirror post meets patient's
Demand；If not meeting, the mirror post can be modified in advance, avoiding problems the pain of patient experience Repeated Operation.
Brief description of the drawings
Drawings in the following description are some embodiments of the present invention, for those of ordinary skill in the art,
On the premise of not paying creative work, other accompanying drawings can also be obtained according to these accompanying drawings.
Light path when Fig. 1 is artificial cornea mirror post optical property detectors measure focal power provided in an embodiment of the present invention is former
Reason figure；
Light path when Fig. 2 is artificial cornea mirror post optical property detectors measure resolution ratio provided in an embodiment of the present invention is former
Reason figure；
Structure when Fig. 3 is artificial cornea mirror post optical property detectors measure focal power provided in an embodiment of the present invention is shown
It is intended to；
Structure when Fig. 4 is artificial cornea mirror post optical property detectors measure resolution ratio provided in an embodiment of the present invention is shown
It is intended to；
Fig. 5 is the structural representation that artificial keratoscope post is arranged on simulated eye.
Reference：
1- lasers；2- polarizers；3- beam expanding lens；
4- preset lenses；5- glass sieve plates；6- resolving power test targets；
7- collimating mirrors；8- simulated eyes；9- microcobjectives；
10- micro eyepieces；11- bases；12- clampers；
81- mirror posts
Embodiment
Technical scheme is clearly and completely described below in conjunction with accompanying drawing, it is clear that described implementation
Example is a part of embodiment of the invention, rather than whole embodiments.Based on the embodiment in the present invention, ordinary skill
The every other embodiment that personnel are obtained under the premise of creative work is not made, belongs to the scope of protection of the invention.
As Figure 1-5, a kind of artificial cornea mirror post optical performance detector that the present embodiment is provided, including：Light source, expansion
Optical assembly, measurement plate, parallel optical assembly, simulated eye 8 and measurement assembly；Light source, expand optical assembly, measurement plate, parallel optical assembly and
Measurement assembly is set gradually along the direction that light beam irradiates, and measurement plate is arranged on the focal plane of parallel optical assembly；Simulated eye 8 is used
In installation mirror post；Expand the diameter for the light beam that optical assembly is used to expand and source of parallel light is sent, and collimated light beam is radiated at measurement
On plate；Parallel optical assembly is used for collimated light beam, and the light beam of collimation is irradiated on the mirror post 81 on simulated eye 8；Survey
Template and measurement assembly coordinate the optical property for measuring mirror post 81.
It should be noted that simulated eye 8, i.e. for simulating the structure of human eye truth, wherein, used in simulated eye 8
Physiological saline replaces the aqueous humor of human eye, to reach the effect for being really；Mirror post to be detected is arranged on simulated eye 8,
And the locating surface of the mirror post 81 reaches light of its geometry air line distance of surface equal to normal eye of display screen by physiological saline
Shaft length, i.e. 24mm；As shown in figure 5, the simulated eye 8 in the as one of which structure of simulated eye 8, the present embodiment is according to people
The structure of eye is by 24 millimeters of designs of axiallength of arm's length standard eye, liquid refractivity and people's aqueous humor in simulated eye 8
Refractive index is all 1.336.This can just meet the requirement of optical design.Light source can have multiple choices, for example：Spot light or
Source of parallel light, etc.；The equipment of spot light and source of parallel light, which can be produced, a variety of selections, the light exported due to laser 1
Beam has higher directionality, monochromaticjty and coherence, therefore, as a kind of preferred scheme, and light source selects laser 1, and
Laser 1 exports directional light.
The main function for expanding optical assembly is the diameter of expanded light beam, and the light beam transmitted from expansion optical assembly is directional light,
Therefore, every component that can be functioned as described above, can serve as the signified expansion optical assembly of the present embodiment.
The effect of parallel optical assembly is to carry out parallel collimation to light beam, it is ensured that the quality for the light beam being radiated on mirror post 81,
Therefore, every component that can be functioned as described above can serve as the signified parallel optical assembly of the present embodiment.Need explanation
It is that, in measurement, mirror post 81 is arranged between parallel optical assembly and measurement assembly.
Measurement plate and measurement assembly coordinate the optical property for measuring artificial cornea mirror post 81, and measurement plate can be differentiated
Rate plate 6 or glass sieve plate 5, can also be other measuring pieces certainly；When measurement plate selects resolving power test target 6, the present embodiment is provided
Artificial cornea mirror post optical performance detector be used to measure the resolution ratio of mirror post 81；When measurement plate selects glass sieve plate 5, this reality
Apply the focal power that the artificial cornea mirror post optical performance detector of example offer is used to measure mirror post 81.
The light path for the artificial cornea mirror post optical performance detector that the present embodiment is provided is moved towards：By light source send it is parallel
Light beam is irradiated in the measurement plate being arranged on parallel optical assembly focal plane after expanding optical assembly and expanding, and is passing through directional light
Light beam after member parallel and collimation is irradiated on mirror post 81, and now, the picture in measurement plate can be presented on the inside of measurement assembly,
Measurement assembly is adjusted, to see clearly as being defined, required numerical value is finally recorded.It should be noted that being penetrated from optical assembly is expanded
Go out light beam and remain directional light, and diameter of the diameter more than the light beam sent by light source of the directional light.
The artificial cornea mirror post optical performance detector that the present embodiment is provided, which can be such that doctor detects before surgery, to pacify
The optical property of the artificial cornea mirror post 81 of dress, and mirror post is detected into its optical property on simulated eye 8, so that inspection
The objective circumstances that result more conforms to human eye are surveyed, accurate reference are provided to doctor, to judge whether the mirror post 81 meets
The demand of patient；If not meeting, the mirror post 81 can be modified in advance, avoiding problems the pain of patient experience Repeated Operation
It is bitter.
On the basis of above-described embodiment, specifically, expanding optical assembly includes expanding portion and parallel portion；The portion of expanding is arranged on light
Between source and parallel portion, the diameter for expanded light beam；Parallel portion is used to diverging light becoming directional light, and by parallel light irradiation
In measurement plate.
The main function for expanding portion is the diameter of expanded light beam, therefore, and every component that can be functioned as described above all may be used
Be the present embodiment it is signified expand portion, for example：The combination of convex lens or a variety of lens.
The main function of parallel portion is will to become directional light by the diverging light expanded, therefore, every to play above-mentioned
The component of effect can serve as the signified parallel portion of the present embodiment, for example：The combination of convex lens or a variety of lens.
When the beam diameter that laser 1 is irradiated is smaller, it may appear that the pattern in measurement plate can not be in artificial cornea mirror
The situation of imaging in the effective diameter of post 81, therefore, setting expands portion, light beam is carried out expanding and then parallel again first, so that
Ensure that the beam diameter being radiated in measurement plate reaches the effective diameter of artificial cornea mirror post 81, it is ensured that it can be in artificial cornea
It is imaged in the effective diameter of mirror post 81.
On the basis of above-described embodiment, specifically, the portion of expanding is beam expanding lens 3, and parallel portion is preset lens 4.Beam expanding lens 3 is set
Put between laser 1 and preset lens 4, the light irradiated from preset lens 4 is radiated in measurement plate.
Beam expanding lens 3 can first converge the collimated light beam sent from laser 1 and then diffuse into spherical wave again, so as to reach
The purpose of expanded light beam diameter.Preset lens 4 can be the spherical wave come out from beam expanding lens 3, i.e. diverging light becomes directional light, so
After be radiated on resolving power test target 6 or glass sieve plate 5.
On the basis of above-described embodiment, specifically, parallel optical assembly includes collimating mirror 7, and collimating mirror 7 is used for parallel and standard
Direct light line, measurement plate is arranged on the focal plane of collimating mirror 7.Carrying out parallel and collimation light by collimating mirror 7 has preferably
Ground collimation, the directional light is radiated on artificial cornea mirror post 81, it is ensured that the precision of measurement.
On the basis of above-described embodiment, specifically, measurement assembly includes micro eyepiece 10 and microcobjective 9, micro- thing
Mirror 9 is arranged between collimating mirror 7 and micro eyepiece 10, the picture that microcobjective 9 is used on measurement by magnification plate, and the picture is presented on
Inside micro eyepiece 10, micro eyepiece 10 is used to measure and reading.
The position of microcobjective 9 needs accurately to be adjusted, it is therefore an objective on resolving power test target 6 or glass sieve plate 5
As being accurately presented in the graticle of micro eyepiece 10, micro eyepiece 10 is internally provided with graticle, in measurement, with point
Picture of the cross intersection alignment artificial cornea mirror post 81 on graticle on plate is drawn, aiming measurement is carried out.
On the basis of above-described embodiment, specifically, polarizer 2, the energy of polarizer 2 are provided with the direction that light beam irradiates
Enough filter the light beam irradiated via light source.
Polarizer 2 can be rotated, and the light beam that laser 1 is exported is partial poolarized light, and rotatory polarization piece 2 is to adjust laser
The use power of the light beam of 1 output；If beam intensity is too high, if directly observing resolving power test target after micro eyepiece 10 with human eye
6 or glass sieve plate 5 on picture, because dazzling will result in is observed inaccurate situation and occurred, at this point it is possible to rotatory polarization piece 2,
So as to reduce the use power of light beam；As long as polarizer 2 is arranged in the direction of advance of light beam, nothing is fastened before and after position
Will.
On the basis of above-described embodiment, specifically, in addition to white screen, the picture for the amplification for being in by microcobjective 9 can
To be received with white screen, so as to facilitate eye-observation.
On the basis of above-described embodiment, specifically, in addition to support, light source, expansion optical assembly, parallel optical assembly and measurement
Component is arranged on support.
By above-mentioned laser 1, polarizer 2, beam expanding lens 3, preset lens 4, collimating mirror 7, simulated eye 8, microcobjective 9 and micrometer
Eyepiece 10 is arranged on same support, and the artificial cornea mirror post optical performance detector for being provided the present embodiment is easy to move
It is dynamic, but also can ensure that each optical element is all located on same optical axis, it is ensured that measurement it is accurate.
On the basis of above-described embodiment, specifically, as shown in Figure 3 and Figure 4, support includes base 11 and multiple clampers
12, multiple clampers 12 are respectively provided with the pedestal 11, and can be slided on the pedestal 11；Each clamper 12 is respectively used to fix
Light source, expansion optical assembly, parallel optical assembly, simulated eye 8 and measurement assembly.
It should be noted that installation micro eyepiece 10 and microcobjective 9 use a clamper 12 for convenience, remaining
Each optical element corresponds to a clamper 12, and all clampers 12 can be slided on the pedestal 11, so as to adjust
Position relationship between optical element；And the height of corresponding optical element can also be adjusted by clamper 12, so that really
All optical elements are protected to be respectively positioned on same optical axis.
On the basis of above-described embodiment, specifically, scale is provided with along along the length direction of base 11.The present embodiment is carried
There is accurate distance between the artificial cornea mirror post optical performance detector of confession, its two neighboring optical element, therefore, in base
Scale is set on 11, when installing optical element, it becomes possible to the step of omission is measured using ruler, so as to accelerate the speed installed
Degree.
The artificial cornea mirror post optical performance detector of the present embodiment offer is provided below by specific embodiment
Principle, measuring method and the resolution ratio and focal power for how calculating mirror post 81.
The actual size of the external diameter of artificial cornea mirror post 81 is about 2.14mm, it is considered to which bevelling, effective stop diameter takes 2mm,Pupil diameter when being read a book equivalent to human eye, the numerical aperture of artificial cornea mirror post 81 is 0.055mm-0.033mm；
In measurement, artificial cornea mirror post 81 is arranged on simulated eye 8.
Light source select laser 1, and laser 1 power be not more than 10mw, output a diameter of 1-1.5mm of directional light,
Wavelength is 532nm partial poolarized light.Polarizer 2 is arranged on the about 35mm of distance lasers 1 position.Beam expanding lens 3 is set
On the output end of distance lasers 1 about 183mm position.A diameter of 38.1mm of preset lens 4, focal length is 150mm, and preset lens
4 are arranged on the position for exporting front end about 228mm apart from beam expanding lens 3.A diameter of 38.1mm of collimating mirror 7, focal length is
300mm, and collimating mirror 7 is arranged on the about 45mm of preset lens 4 position, is required according to standard, the focal length of collimating mirror 7 should
More than 10 times or so of the focal length of artificial cornea mirror post 81.
The multiplication factor of microcobjective 9 is 8 times, and numerical aperture is 0.25, much larger than the numerical aperture of artificial cornea mirror post 81
Footpath, this is the necessary condition for ensureing resolution measurement precision；So-called numerical aperture may be interpreted as the bore of microcobjective 9 herein
1/2nd divided by the microcobjective 9 focal length obtained by numerical value；Microcobjective 9 is arranged on 8 about 24mm of range simulation eye
Position on, and the front and back position of microcobjective 9 needs accurate adjustment, so that the picture on resolving power test target 6 and Bo Luo plates 5 being capable of essence
It is in really that in the graticle of micro eyepiece 10, can be observed and be clearly defined by human eye.The multiplication factor of micro eyepiece 10 is 10 times,
Linear field 10mm, measurement range is 0-8mm, and microdrum scale division value 0.01mm, precision is less than or equal to 0.1mm.
The normal line of glass sieve plate 5 to away from corresponding actual measurement line to away from being shown in Table 1：
Table 1
| Normal line is to away from (mm) | Line is surveyed to away from (mm) |
| 2 | 2.0010 |
| 4 | 4.0015 |
| 10 | 10.0015 |
| 20 | 20.0070 |
Each pattern conversion table is shown in Table 2 on No.4 resolving power test targets：
The No.4 resolving power test target pattern conversion tables of table 2
| NO4 Slab elements number | Width of fringe (micron) | 1 millimeter of upper fringe number |
| 1 | 80.0 | 6.25 |
| 2 | 75.5 | 6.62 |
| 3 | 71.3 | 7.02 |
| 4 | 67.3 | 7.43 |
| 5 | 63.5 | 7.87 |
| 6 | 59.9 | 8.34 |
| 7 | 56.6 | 8.84 |
| 8 | 53.4 | 9.36 |
| 9 | 50.4 | 9.92 |
| 10 | 47.6 | 10.5 |
| 11 | 44.9 | 11.1 |
| 12 | 42.4 | 11.8 |
| 13 | 40.0 | 12.5 |
| 14 | 37.8 | 13.2 |
| 15 | 35.6 | 14.0 |
| 16 | 33.6 | 14.9 |
| 17 | 31.7 | 15.7 |
| 18 | 30.0 | 16.7 |
| 19 | 28.3 | 17.7 |
| 20 | 26.7 | 18.7 |
It should be noted that spherical wave of the laser 1 by the focus point formation of beam expanding lens 3 passes through preset lens 4, collimating mirror
7 image on the artificial cornea mirror post 81 close to collimating mirror 7, not only ensure collimating mirror 7 to resolving power test target 6 or focal length measurement
The high-quality imaging of Porro tester, and artificial keratoscope post 81 is turned into effective stop, so, the luminous energy of laser 1 has maximum
Utilization rate, and make the chief ray of each visual field by artificial cornea mirror post 81, the light beam of each visual field can be effectively imaged.
Artificial cornea is the product for the similar human cornea that medical macromolecular materials are made, and artificial cornea generally comprises mirror post
81 and support two parts, wherein, mirror post 81 is made of the stable transparent material of excellent optical characteristics, physicochemical properties, is used
To substitute the muddy cornea that eyeball optics path is hindered after lesion；The major optical performance of mirror post 81 includes focal power and resolution
Rate.Patient is after artificial cornea is installed, and the quality of the optical property of mirror post 81 largely determines its visual performance
Quality, therefore, before being performed the operation, it is necessary to which focal power and resolution ratio to the mirror post 81 of artificial cornea detect, from
And can verify mirror post 81 to be installed meet the demand of patient.
First, the focal power of artificial cornea mirror post is measured using above-mentioned optical element：
1：Prove the correctness of light path principle
Light path as shown in Figure 1, has observed professional standard YY0290.2-2009《Opticianry：Artificial lens second
Point：Optical property and test method》The principle of defined figure A.1, the light beam transmitted on glass sieve plate 5 is converging light, machinery knot
Structure design is accurate to be ensured：Glass sieve plate 5 is located in the focal plane of collimating mirror 7, and each object point thereon all becomes flat by collimating mirror 7
Row light, effective stop of its central ray by being measured artificial cornea mirror post 81Center, through being measured people
Work keratoscope post 81 is focused in the focal plane of collimating mirror 7, now, the normal line on glass sieve plate 5 into one diminution picture,
The multiple of diminution is equal to the ratio between focal length and the measured focal length of artificial cornea mirror post 81 of collimating mirror 7.The nominal focal length of collimating mirror 7
300mm, real focal length is calculated by design and measurement should be 300.4548mm.Pass through above-mentioned design light path, it is impossible to shorten light
Road, directional light also improves as matter, and the light bar spherical aberration at the effective stop φ 2mm of measured artificial cornea center is also small more
, so as to obtain accurate measurement data.
2：The focal power of artificial cornea mirror post is calculated by measuring and amplifying rate
Normal line of the glass sieve plate 5 on the focal plane of collimating mirror 7 refers to table 1 to there is 4 pairs, should be according to measured artificial
The linear field of keratoscope post 81 correctly to select to use line pair.
In the line pair that selection is used, it is necessary to the adaptability of microcobjective 9 and measuring eyepiece is considered, due to micrometer mesh
The measurement range of mirror 10 is 8mm, and the magnifying power of microcobjective 9 is 8 times, and the object space linear field converted to microcobjective 9 should be
1mm, has a minification, this multiple is not small in object space and the measured image space of artificial cornea mirror post 81 of collimating mirror 7
In 10 times, so the line correspondence of glass sieve plate 5 is as selection 2mm, 4mm.
Chosen correct using line to rear, the focal power of artificial cornea mirror post 81 is calculated according to formula (1)：
F=(fc/htarget)htarget,x (1)
In formula：The focal length of f-measured artificial cornea mirror post；
fc- collimating mirror focal length, 300.4548mm；
htargetThe line of-glass sieve plate to away from；
htarget,x- in the back focal plane of measured artificial cornea mirror post, i.e. obtained glass sieve plate is measured in image space indirectly
Image space line to away from.
The measured back focal plane of artificial cornea mirror post 81, i.e. the image space line of image space Nei Boluo plates 5 is to away from being micro- by 8 times
Object lens 9 are imaged on the front focal plane of micro eyepiece 10, are measured twice by micro eyepiece 10 and to be subtracted each other result divided by 8 obtain, specific meter
Calculation method, is shown in formula (2)：
Htarget,x=htarget,M/8 (2)
In formula：htarget,M- micro eyepiece twice measurement result subtract each other gained numerical value；
Htarget,x- in the back focal plane of measured artificial cornea mirror post, i.e. obtained glass sieve plate is measured in image space indirectly
Image space line to away from.
The multiplication factor of 8-microcobjective 9.
3：How double measurement is carried out using micro eyepiece
Graticle with cross intersection and double grooves, is promoted by leading screw mircrometer gauge, perpendicular to the optical axis of micro eyepiece 10
Mobile, the amount of movement of screw mandrel vertically is the amount of movement of cross intersection or double grooves on graticle in screw mandrel mircrometer gauge.Surveying
During amount, in the visual field of micro eyepiece 10, it is directed at artificial cornea mirror post 81 with the cross intersection on graticle or double grooves and is dividing
The picture on plate is drawn, aiming measurement is carried out, is stayed alone numerical value, rereading by fixed reticle in visual field and measuring appliance reading drum
Difference be size that measurand is imaged on graticle, micro eyepiece 10 functions as magnifying glass, to improve aiming
Precision.
2nd, the resolution ratio of artificial cornea mirror post is measured
1：Prove the correctness of light path principle
Light path as shown in Figure 2, Design of Mechanical Structure accurately ensures that resolving power test target 6 is arranged in the focal plane of collimating mirror 7,
Each object point on resolving power test target 6 all becomes directional light by collimating mirror 7, and its central ray is by being measured artificial cornea mirror
The effective stop of post 81Center, focused on by measured artificial cornea mirror post 81 in the focal plane of collimating mirror 7,
Into the picture of a diminution, due to collimating mirror 7 focal length for 10 times of artificial 81 focal length of keratoscope post or more than, so resolving power test target
6 picture reduces 10 times or more, and the size of picture should be not more than 1mm*1mm, and diagonal should be not more than 1.41mm.
With reference to the data of human eye：
The dioptric system of human eye includes：Cornea, aqueous humor, crystal and vitreum, design parameter are shown in Table 3, the standard light of human eye
Focal power is 58.64D, and focal length is 17.0532mm, and axiallength is 24mm.
The human eye dioptric system parameter of table 3
| Refracting media | Refractive index | Thickness (mm) | Radius of curvature | Focal power | Aperture (mm) |
| Cornea | 1.376 | 0.5 | + 7.7 ,+6.8 | +43D | 10.5-11 |
| Aqueous humor | 1.336 | 3 | |||
| Crystalline lens | 1.406 | 3.6 | + 10, -6 | +19D | 9-10 |
| Vitreum | 1.336 | 16.9 |
As shown in Table 3, cornea accounts for the 70%-75% of human eye focal power；Macula lutea is most sensitive on retina, diameter 1-3mm；Root
According to eyes visual field, when eyes are motionless, static visual field is 5 degree, and the front focal length of eyes is -16.68, and back focal length is 22.29, is calculated
Go out a diameter of 1.94mm of macula lutea, the parameter of reference man's refraction of eye system, the angular field of measured artificial cornea mirror post 81 should determine
Position is 5 degree, and linear field is that its focal length is multiplied by 2.5 degree of tangents, multiplied by with 2, can about position 2-3mm or so.
No.4 resolving power test targets 6, pattern 10mm*10mm, thereon each object point all become directional light by collimating mirror 7, then
Focused on by measured artificial cornea mirror post 81 in its focal plane, into the picture of a diminution, this is not more than as diagonal
1.41mm, and 1.41mm is less than or equal to 2-3 millimeters, while again smaller than the design linear field 2.4mm of 8 x Microscope Objectives 9, so this
The design of light path is correct.
2：Measure the resolution ratio of artificial cornea mirror post
The picture of a diminution is focused into by being measured artificial cornea mirror post 81, positioned at 8 times of microcobjective 9 of multiplication factor
In front focal plane, the picture of an amplification can be formed a long way off by microcobjective 9, the picture of the amplification can be received using white screen,
Human eye sees which the unit number pattern that can be differentiated, and 1 millimeter of upper fringe number E can be found using table 2.Need explanation
It is that white screen can be blank or wall, etc..
Spatial frequency ν represents (mm-1) with the inverse of millimeter, and most thin distinguishable pattern is calculated from formula (3)：
N=(fc/f)*E (3)
In formula：Fc-collimating mirror focal length；
The focal length of f-artificial cornea mirror post；
Fringe number on which unit number pattern that E-human eye is differentiated is corresponding 1 millimeter.
On laser 1 selection it should be noted that：
The professional standards of YY0290.2-2009《Opticianry：Artificial lens Part II：Optical property and test method》
Middle requirement, along the accurate positioning of optical axis to 0.01mm, is difficult to accomplish using common spot light, and particularly artificial cornea mirror post 81 is very
It is small, it is difficult to clamp.Laser straight good linearity, laser spot is easily done in the effective aperture of artificial cornea mirror post 81, favorably
In the validity and accuracy of the effective stop of artificial cornea mirror post 81.
According to《The Optical Instrument Designing handbook first volume》, when pupil diameter is 2mm or so, human eye sensitive wavelength exists
Between 550nm -512nm, so selection green 532nm is also quite reasonable.
Because laser energy density is big, the picture of a diminution is focused into by being measured artificial cornea mirror post 81, positioned at putting
In the front focal plane of microcobjective 9 of big 8 times of multiple, the picture of an amplification can be formed a long way off by microcobjective 9, human eye is seen
Which the unit number pattern that can be differentiated, it is very objective.
Finally it should be noted that：Various embodiments above is merely illustrative of the technical solution of the present invention, rather than its limitations；To the greatest extent
The present invention is described in detail with reference to foregoing embodiments for pipe, it will be understood by those within the art that：Its according to
The technical scheme described in foregoing embodiments can so be modified, or which part or all technical characteristic are entered
Row equivalent substitution；And these modifications or replacement, the essence of appropriate technical solution is departed from various embodiments of the present invention technology
The scope of scheme.
Claims (10)
1. a kind of artificial cornea mirror post optical performance detector, it is characterised in that including：Light source, expand optical assembly, it is measurement plate, flat
Row optical assembly, simulated eye and measurement assembly；The light source, the expansion optical assembly, the measurement plate, the parallel optical assembly and institute
Measurement assembly is stated to set gradually along the direction that light beam irradiates, and the measurement plate is arranged on the focal plane of the parallel optical assembly
On；The simulated eye is used to install mirror post；
The optical assembly that expands is used to expanding the diameter of light beam sent with the parallel light source, and described in collimated light beam is radiated at
In measurement plate；The parallel optical assembly is used for collimated light beam, and the light beam of collimation is irradiated on the simulated eye
On mirror post；The measurement plate and the measurement assembly coordinate the optical property for measuring mirror post.
2. artificial cornea mirror post optical performance detector according to claim 1, it is characterised in that the expansion optical assembly bag
Include the portion of expanding and parallel portion；The portion of expanding is arranged between the light source and the parallel portion, the diameter for expanded light beam；
The parallel portion is used to diverging light becoming directional light, and directional light is radiated in the measurement plate.
3. artificial cornea mirror post optical performance detector according to claim 2, it is characterised in that the portion of expanding is expansion
Shu Jing, the parallel portion is preset lens.
4. artificial cornea mirror post optical performance detector according to claim 3, it is characterised in that the parallel optical assembly
Including collimating mirror, the collimating mirror is used for parallel and collimated ray, and the measurement plate is arranged on the focal plane of the collimating mirror.
5. artificial cornea mirror post optical performance detector according to claim 4, it is characterised in that the measurement assembly bag
Micro eyepiece and microcobjective are included, the microcobjective is arranged between the collimating mirror and the micro eyepiece, described micro-
Object lens are used to amplify the picture in the measurement plate, and the picture is presented on inside the micro eyepiece, and the micro eyepiece is used for
Measurement and reading.
6. artificial cornea mirror post optical performance detector according to claim 5, it is characterised in that the measurement plate is to divide
Resolution plate or glass sieve plate.
7. artificial cornea mirror post optical performance detector according to claim 6, it is characterised in that the side irradiated in light beam
Polarizer is set up, the polarizer can filter the light beam irradiated via the light source.
8. the artificial cornea mirror post optical performance detector according to claim any one of 1-7, it is characterised in that also include
Support, the light source, the expansion optical assembly, the parallel optical assembly and the measurement assembly are respectively provided with the bracket.
9. artificial cornea mirror post optical performance detector according to claim 8, it is characterised in that the support includes bottom
Seat and multiple clampers, multiple clampers are arranged on the base, and can be slided on the base；Each institute
Clamper is stated to be respectively used to fix the light source, the expansion optical assembly, the parallel optical assembly, the simulated eye and the measurement
Component.
10. artificial cornea mirror post optical performance detector according to claim 9, it is characterised in that along the base
Scale is provided with length direction.
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