CN209678476U - A kind of retinal visual acuity instrument - Google Patents
A kind of retinal visual acuity instrument Download PDFInfo
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- CN209678476U CN209678476U CN201920159357.2U CN201920159357U CN209678476U CN 209678476 U CN209678476 U CN 209678476U CN 201920159357 U CN201920159357 U CN 201920159357U CN 209678476 U CN209678476 U CN 209678476U
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- sighting target
- convex lens
- visual acuity
- lens sheet
- retinal visual
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Abstract
The utility model discloses a kind of retinal visual acuity instrument, including shell and the LED light source being arranged on shell, aperture, condenser, sighting target panel, composite prism, spectroscope, big convex lens sheet, small convex lens sheet and eyepiece.LED light source, aperture, condenser, sighting target panel, composite prism and spectroscope are arranged along same optical path line, and spectroscopical reflection light enters tested eye by eyepiece；The light being reflected back from tested eyes retina, then by spectroscopical transmission, sequentially pass through small convex lens sheet and big convex lens sheet enters in examiner's eye.The utility model forms interference fringe by above-mentioned train of optical elements on the retina of patient, and then patient is allowed to judge whether interference fringe is visible and direction change, judgement obtain the eyesight status of patient's retina, convenient for predicting postoperative surgical effect.
Description
Technical field
The utility model relates to the technical fields of vision tester for eyesight, more particularly to a kind of retinal visual acuity instrument.
Background technique
Cataract is common complaint among the elderly frequently-occurring disease.And the patient for suffering from cataract in clinical ophthalmology occupies sizable ratio
Example.The main method for the treatment of cataract is operative treatment at present.For suffering from the patient of cataract, since crystalline lens has become mixed
It is turbid, the eyesight status of retina can not be often checked before the surgery, Postoperative visual acuity will be difficult to make prior estimate in this way.
If retinal function goes wrong, cataract patient is also poor even by operative treatment, postoperative eyesight status, if
It is preoperative to inform patient, patient can also be allowed to predict art in advance to avoid postoperative because of doctor-patient dispute caused by dysphotia
Eyesight status afterwards.
Utility model content
The purpose of the utility model is to provide a kind of retinal visual acuity instrument, to solve the above-mentioned problems of the prior art,
So that examiner is capable of detecting when the retinal visual acuity situation of patient in the preoperative, and anticipated that postoperative eyesight status.
To achieve the above object, the utility model provides following scheme:
The utility model provides a kind of retinal visual acuity instrument, the LED light including shell and setting on the housing
Source, aperture, condenser, sighting target panel, composite prism, spectroscope, big convex lens sheet, small convex lens sheet and eyepiece, the LED
Light source, the aperture, the condenser, the sighting target panel, the composite prism and the spectroscope are along same optical path
Line setting, spectroscopical reflection light are entered in tested eye by the eyepiece；The light being reflected back from tested eyes retina
Line, then by spectroscopical transmission, sequentially pass through small convex lens sheet and big convex lens sheet enters in examiner's eye.
Preferably, there are six striped sighting targets for setting on the sighting target panel.
Preferably, the striped sighting target is round and the center of circle around the sighting target panel is evenly distributed with.
Preferably, the striped gap of the striped sighting target successively becomes larger or becomes smaller.
Preferably, the view for the handwheel that can rotate sighting target panel being provided on the shell and being matched with the striped sighting target
Power mark.
Preferably, the composite prism can rotate, and be arranged on the shell and match with the four sides of the composite prism
Station location marker.
The utility model achieves following technical effect compared with the existing technology:
The utility model makes light form interference fringe, Jin Errang on the retina of patient by a series of optical elements
Patient judges whether interference fringe is visible and direction change, judgement obtain the eyesight status of patient's retina, postoperative convenient for predicting
Surgical effect.
Detailed description of the invention
In order to illustrate the embodiment of the utility model or the technical proposal in the existing technology more clearly, below will be to embodiment
Needed in attached drawing be briefly described, it should be apparent that, the accompanying drawings in the following description is only the utility model
Some embodiments for those of ordinary skill in the art without creative efforts, can also be according to this
A little attached drawings obtain other attached drawings.
Fig. 1 is the optical principle schematic diagram of the utility model retinal visual acuity instrument；
Fig. 2 is the structural schematic diagram of sighting target panel in the utility model；
Fig. 3 is the schematic illustration that retina forms interference fringe in the utility model；
Wherein: 1-LED light source, 2- aperture, 3- condenser, 4- sighting target panel, 5- composite prism, 6- spectroscope, 7- mesh
Mirror, the small convex lens sheet of 8-, the big convex lens sheet of 9-, 10- are detected eye, 11- striped sighting target.
Specific embodiment
The following will be combined with the drawings in the embodiments of the present invention, carries out the technical scheme in the embodiment of the utility model
Clearly and completely describe, it is clear that the described embodiments are only a part of the embodiments of the utility model, rather than whole
Embodiment.Based on the embodiments of the present invention, those of ordinary skill in the art are in the premise not made the creative labor
Under every other embodiment obtained, fall within the protection scope of the utility model.
It is of the existing technology to solve the problems, such as the purpose of the utility model is to provide a kind of retinal visual acuity instrument, make to examine
The person of looking into is capable of detecting when the retinal visual acuity situation of patient in the preoperative, and anticipated that postoperative eyesight status.
To keep the above objects, features, and advantages of the utility model more obvious and easy to understand, with reference to the accompanying drawing and have
Body embodiment is described in further detail the utility model.
It is as shown in Figure 1 to Figure 3: to present embodiments provide a kind of retinal visual acuity instrument, including shell and setting in shell
On LED light source 1, aperture 2, condenser 3, sighting target panel 4, composite prism 5, spectroscope 6, big convex lens sheet 9, small convex lens
Piece 8 and eyepiece 7 are additionally provided with the switch of LED light source 1 on shell.LED light source 1, condenser 3, sighting target panel 4, is answered at aperture 2
It closes prism 5 and spectroscope 6 to be arranged along same optical path line, there are six striped sighting targets 11 for setting on sighting target panel 4.Wherein, striped regards
Mark 11 is uniformly distributed for the round and center of circle around sighting target panel 4；The striped gap of striped sighting target 11 successively becomes larger or becomes smaller.It is set on shell
The eyesight for being equipped with the handwheel that can rotate sighting target panel 4 and matching with striped sighting target 11 marks.Composite prism 5 can rotate, shell
The station location marker to match with the four sides of composite prism 5 is set on body.According to the mark and mark on shell, striped sighting target 11 with
The cooperation rotation of composite prism 5, shows the sighting target of different directions and different striped gaps, the eyesight of retina is carried out to patient
Detection.
The reflection light of spectroscope 6 is entered in tested eye 10 by eyepiece 7；The light that the retinal reflex of tested eye returns,
Small convex lens sheet 8 is sequentially passed through by the transmission of spectroscope 6 again and big convex lens sheet 9 enters in examiner.According to optical path can
Inverse property, examiner can viewing ray whether reach in tested eye 10.
The specifically used method of the retinal visual acuity instrument of the present embodiment is as follows:
The retinal visual acuity instrument of the present embodiment is tested eyesight primarily directed to cataract patient to be used.In use, patient
Eye is placed in 7 side of eyepiece, opens LED light source 1, and examiner observes LED light source 1 with eyes in big 9 side of convex lens sheet and issues
Light whether enter patient eye in, and according to the location-appropriate of light adjust eyes of patients position.When light falls in trouble
When on the crystalline lens of person, sighting target panel 4 and composite prism 5 are rotated, to adjust the striped gap and direction of sighting target, is suffered from convenient for detection
Identification of the person to sighting target, judgement obtain the eyesight status of patient's retina, convenient for predicting postoperative surgical effect.
Specific visual angle and the Interferometric visual acuity table of comparisons are as follows:
| Visual angle (point/degree) | 20 ' | 10 ', 01 ＂ | 3 ', 59 ＂ | 2 ', 31 ＂ | 2 ' |
| Interferometric visual acuity (IVA) | 0.1 | 0.2 | 0.5 | 0.8 | 1.0 |
It applies specific case in this specification to be expounded the principles of the present invention and embodiment, the above reality
The explanation for applying example is merely used to help understand the method and its core concept of the utility model；Meanwhile for the general of this field
Technical staff, based on the idea of the present invention, there will be changes in the specific implementation manner and application range.To sum up institute
It states, the content of the present specification should not be construed as a limitation of the present invention.
Claims (6)
1. a kind of retinal visual acuity instrument, it is characterised in that: including LED light source, the aperture of shell and setting on the housing
Diaphragm, condenser, sighting target panel, composite prism, spectroscope, big convex lens sheet, small convex lens sheet and eyepiece, the LED light source, institute
Aperture, the condenser, the sighting target panel, the composite prism and the spectroscope is stated to be arranged along same optical path line,
Spectroscopical reflection light is entered in tested eye by the eyepiece；The light being reflected back from tested eyes retina, then lead to
Spectroscopical transmission is crossed, small convex lens sheet is sequentially passed through and big convex lens sheet enters in examiner's eye.
2. retinal visual acuity instrument according to claim 1, it is characterised in that: there are six stripeds to regard for setting on the sighting target panel
Mark.
3. retinal visual acuity instrument according to claim 2, it is characterised in that: the striped sighting target is round and around described
The center of circle of sighting target panel is uniformly distributed.
4. retinal visual acuity instrument according to claim 2, it is characterised in that: the striped gap of the striped sighting target successively becomes
Greatly or become smaller.
5. retinal visual acuity instrument according to claim 2, it is characterised in that: be provided on the shell described in capable of rotating
The handwheel of sighting target panel and the eyesight to match with the striped sighting target mark.
6. retinal visual acuity instrument according to claim 1, it is characterised in that: the composite prism can rotate, the shell
The station location marker to match with the four sides of the composite prism is provided on body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920159357.2U CN209678476U (en) | 2019-01-30 | 2019-01-30 | A kind of retinal visual acuity instrument |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920159357.2U CN209678476U (en) | 2019-01-30 | 2019-01-30 | A kind of retinal visual acuity instrument |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209678476U true CN209678476U (en) | 2019-11-26 |
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| CN201920159357.2U Active CN209678476U (en) | 2019-01-30 | 2019-01-30 | A kind of retinal visual acuity instrument |
Country Status (1)
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| CN (1) | CN209678476U (en) |
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2019
- 2019-01-30 CN CN201920159357.2U patent/CN209678476U/en active Active
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