CN103431836B - Watch sighting target attentively and watch the using method of sighting target attentively - Google Patents
Watch sighting target attentively and watch the using method of sighting target attentively Download PDFInfo
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- CN103431836B CN103431836B CN201310393506.9A CN201310393506A CN103431836B CN 103431836 B CN103431836 B CN 103431836B CN 201310393506 A CN201310393506 A CN 201310393506A CN 103431836 B CN103431836 B CN 103431836B
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Abstract
The present invention relates to measurement or the detection field of ophthalmology, particularly watch sighting target attentively and watch the using method of sighting target attentively.This watches sighting target attentively, comprising: point source and cylindrical body; Point source is located at one end of cylindrical body; The other end opening of cylindrical body.This using method of watching sighting target attentively is, the sight line of cylindrical body guiding detected person is gathered portion in the inner and seen point source.The using method of watching sighting target attentively and watching sighting target attentively provided by the invention, by arranging cylindrical body, the sight line of detected person needs just can see by one end of cylindrical body opening the point source being positioned at the closed other end, also the fixation axis of detected person is namely made to be forced to be positioned at the inside of cylindrical body, thus when detected person being reported watch sighting target attentively, really be " watching attentively " sighting target but not " seeing " sighting target, thus make measurement result deviation less.
Description
Technical field
The present invention relates to measurement or the detection field of ophthalmology, in particular to watching sighting target attentively and watching the using method of sighting target attentively.
Background technology
Watching sighting target attentively, is a kind of device for ophthalmic measurement or detection.Be generally used for measurement detected person being carried out to the measurement of axis oculi, the measurement of slant visibility, the measurement at angle, room or artificial intraocular lenses inclination angle.
Usually adopt the red point source continuing bright or flicker as watching sighting target attentively in correlation technique, when carrying out ophthalmic measurement or detecting, tester can require detected person to watch sighting target attentively and answer whether watch attentively, whether detected person's report is watched attentively.
Because correlation technique is when doing ophthalmic measurement or detecting, as shown in Figure 1, using point source 1 as sighting target, when detected person sees to point source, the line on point source 1 and retina between imaging point is fixation axis 3; When point source 1 falls into fundus flavimaculatus central fovea 5, with the line of fundus flavimaculatus central fovea 5 and point source 1 for normal line 2; When point source 1 falls into fundus flavimaculatus central fovea 5, fixation axis 3 overlaps with normal line 2, now, meets the detected person medically assert and " watches " sighting target attentively; When point source 1 falls into fundus flavimaculatus perifovea edge 4, when fixation axis 3 and normal line 2 form an angle, detected person " sees " point source, does not meet the detected person medically assert and " watches " sighting target attentively.But detected person not necessarily knows " seeing " and the difference of " watching attentively ", during report " watching attentively " point source 1, be likely " seeing " point source 1, thus make measuring result error larger.
Summary of the invention
The object of the present invention is to provide the using method of watching sighting target attentively and watching sighting target attentively, to solve the above problems.
Provide in an embodiment of the present invention and watch sighting target attentively, comprising: point source and cylindrical body;
Described point source is located at one end of described cylindrical body; The other end opening of described cylindrical body.
The above embodiment of the present invention watch sighting target attentively, by arranging cylindrical body, the sight line of detected person needs just can see by one end of cylindrical body opening the point source being positioned at the closed other end, also the fixation axis of detected person is namely made to be forced to be positioned at the inside of cylindrical body, thus when detected person being reported watch sighting target attentively, really be " watching attentively " sighting target but not " seeing " sighting target, thus make measurement result deviation less.
Additionally provide a kind of using method of watching sighting target attentively as described in above-described embodiment in an embodiment of the present invention, described cylindrical body guides the sight line of detected person to gather to see point source in the inside of described cylindrical body.
The using method of watching sighting target attentively of the above embodiment of the present invention, by arranging cylindrical body, the sight line of detected person needs just can see by one end of cylindrical body opening the point source being positioned at the closed other end, also the fixation axis of detected person is namely made to be forced to be positioned at the inside of cylindrical body, thus when detected person being reported watch sighting target attentively, really be " watching attentively " sighting target but not " seeing " sighting target, thus make measurement result deviation less.
Accompanying drawing explanation
Fig. 1 shows in correlation technique the schematic diagram watching sighting target attentively;
Fig. 2 shows and of the present inventionly watches sighting target schematic diagram in use attentively;
The schematic diagram of the angle of axiallength Lc and true axiallength L in the measurement error that Fig. 3 allows when showing IOL measuring;
The lenth ratio that Fig. 4 shows the width and cylindrical body of watching the point source of sighting target attentively of the present invention equals the schematic diagram of tan α.
1-point source; 2-normal line; 3-fixation axis; 4-fundus flavimaculatus perifovea edge; 5-fundus flavimaculatus central fovea; 6-cylindrical body.
Detailed description of the invention
Also by reference to the accompanying drawings the present invention is described in further detail below by specific embodiment.
Watch sighting target attentively, as shown in Figure 2, comprising: point source 1 and cylindrical body 6; Point source 1 is located at one end of cylindrical body 6; The other end opening of cylindrical body 6.
The above embodiment of the present invention watch sighting target attentively, by arranging cylindrical body 6, the sight line of detected person needs just can see by one end of cylindrical body 6 opening the point source 1 being positioned at the closed other end, also be, the fixation axis 3 of detected person is made to be forced to be positioned at the inside of cylindrical body 6, thus when detected person being reported watch sighting target attentively, be really " watching attentively " sighting target but not " seeing " sighting target, thus make measurement result deviation less.
Preferably, watch attentively in sighting target above-mentioned, the ratio of the width of point source 1 and the length of cylindrical body 6 is less than tan7.4 °.
Wherein, the source of tan7.4 ° is: the SRKII formula (known) according to IOL measuring:
wherein P is the artificial intraocular lenses's diopter needing to implant, and A is artificial crystal constant, and L is the length of axis oculi, k1 and k2 is the corneal curvature of mutually perpendicular direction.
It is dioptric unit Diopter that deviation due to the P of successful surgery is less than 0.5D(D), so, the deviation of axis oculi L should be less than 0.2, thus, as shown in Figure 3, there has been following formula:
Dx (Dx >=0) is wherein operating distance (light source is to corneal vertex), and Lc is the axiallength measuring gained, and the angle of deviation produced when watching attentively is α, W is the deflection distance of the measurement point on wall of eyeball apart from axis oculi.
From above-mentioned formula, Dx is larger, then corresponding skew angle is less.This just means, cursor distance eyeball is far away, and the angle of deviation of permission is less.With adult normal's axis oculi for 24mm, Dx get 0 ~+∞ mm, then α is at 7.4 ° ~ 0 °.
Tan7.4 ° is less than by the ratio of the width of set-point light source 1 and the length of cylindrical body 6, when the sight line of detected person sees by one end of cylindrical body 6 opening the point source 1 being positioned at the closed other end, also namely the fixation axis 3 of detected person is forced the inside being positioned at cylindrical body 6, thus when detected person being reported watch sighting target attentively, really be " watching attentively " sighting target but not " seeing " sighting target, thus make measurement result deviation less
Preferably, watch attentively in sighting target above-mentioned, point source 1 is LED point light source.
Be LED point light source by set-point light source 1, make the life-span of the point source 1 watching sighting target attentively long, power consumption is little and cost is low.
Preferably, watch attentively in sighting target above-mentioned, point source 1 is intensity adjustable point source.
Be intensity adjustable point source by set-point light source 1, can according to the brightness of brightness adjustment point source 1 watching indoor when sighting target uses attentively, the demand making its brightness more meet medical science to detect.
Preferably, watch attentively in sighting target above-mentioned, point source 1 is red intensity adjustable point source.
Be red intensity adjustable point source by set-point light source 1, improve human body to the sensitivity of the color of point source 1, contribute to user and find and watch sighting target attentively and watch attentively, improve the service efficiency of watching sighting target attentively.
Preferably, watch attentively in sighting target above-mentioned, cylindrical body 6 is cylinder and internal diameter is≤2mm.
By arranging cylindrical body 6 for cylinder and internal diameter is≤2mm, being convenient to make human eye to watch from all directions the detection data result that sighting target obtains attentively consistent, internal diameter being set for≤2mm, meeting clinical medical need.
Watch a using method for sighting target attentively, cylindrical body 6 guides the sight line of detected person to gather to see point source 1 in the inside of cylindrical body 6.
The using method of watching sighting target attentively of the above embodiment of the present invention, by arranging cylindrical body 6, the sight line of detected person needs just can see by one end of cylindrical body 6 opening the point source 1 being positioned at the closed other end, also the fixation axis 3 of detected person is namely made to be forced to be positioned at the inside of cylindrical body 6, thus when detected person being reported watch sighting target attentively, really be " watching attentively " sighting target but not " seeing " sighting target, thus make measurement result deviation less.
Preferably, watch attentively in the using method of sighting target above-mentioned, when user uses and watches the device of sighting target attentively, meet formula
wherein α is the angle of deviation that produces when watching attentively and tan α is the ratio of the width of point source 1 and the length of cylindrical body 6, and L is the length of axis oculi, and Dx is the operating distance that light source arrives corneal vertex.
When sighting target is watched in use attentively, demand fulfillment condition B<W, as shown in Figure 3, Figure 4,
As Dx=0, α=7.4 °, W=3.1mm; Work as Dx=40mm, α=1.7 °, W=1.9mm; Work as Dx=80mm, α=1 °, W=1.8mm; Work as Dx=200mm, α=0.4 °, W=1.6mm.
Again due to C=B/tana, wherein C is the length of cylindrical body 6, and B is the diameter of sighting target light source.Visible, affect the scope (corresponding is α angle) of the factors dictate error of sighting target tube length degree C, the diameter B of sighting target light source, operating distance Dx, axiallength L etc.If Dx and L is certain, source diameter is less, and the optical tube length of needs is shorter.
Such as, when source diameter is 1mm and 0.5mm, adult normal's axis oculi is about 24mm, requires that the axis oculi error measured is less than 0.2mm, and during operating distance 200mm, according to formula (1) 1 and (3), the length of the sighting target cylinder that can need is for being respectively 137mm and 69mm.
Therefore, by being set using the condition of watching sighting target attentively, be convenient to make according to the demand of user and produce watch sighting target attentively, and convenient according to the condition of watching sighting target attentively, measure the parameter required for ophthalmic measurement fast and accurately.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (7)
1. watch a sighting target attentively, it is characterized in that, comprising: point source and cylindrical body;
Described point source is located at one end of described cylindrical body; The other end opening of described cylindrical body;
When watching the device of sighting target attentively described in user uses, meet formula
wherein α is the angle of deviation that produces when watching attentively and tan α is the ratio of the width of described point source and the length of described cylindrical body, and L is the length of axis oculi, and Dx is the operating distance that light source arrives corneal vertex.
2. according to claim 1ly watch sighting target attentively, it is characterized in that, the ratio of the width of described point source and the length of described cylindrical body is less than tan7.4 °.
3. according to claim 2ly watch sighting target attentively, it is characterized in that, described point source is LED point light source.
4. according to claim 2ly watch sighting target attentively, it is characterized in that, described point source is intensity adjustable point source.
5. according to claim 4ly watch sighting target attentively, it is characterized in that, described point source is red intensity adjustable point source.
6. according to claim 4ly watch sighting target attentively, it is characterized in that, described cylindrical body is cylinder and internal diameter is≤2mm.
7. the using method of watching sighting target attentively as described in any one of claim 1-6, is characterized in that, described cylindrical body guides the sight line of detected person to gather to see point source in the inside of described cylindrical body.
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| CN201310393506.9A CN103431836B (en) | 2013-09-02 | 2013-09-02 | Watch sighting target attentively and watch the using method of sighting target attentively |
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| US5013319A (en) * | 1989-06-05 | 1991-05-07 | Mount Sinai School Of Medicine Of The City University Of New York | Apparatus and method for cornea marking |
| CN2552474Y (en) * | 2002-06-22 | 2003-05-28 | 顾宝文 | Strabismus quantitative photographic analyser |
| CN101411607A (en) * | 2007-10-16 | 2009-04-22 | 张光荣 | Device for photographing conjunctiva and sclera of eyeball |
| CN201308475Y (en) * | 2008-12-02 | 2009-09-16 | 南昌航空大学 | Human eye subjective visual-quality diagnostic apparatus |
| CN101766472A (en) * | 2009-12-31 | 2010-07-07 | 中国科学院长春光学精密机械与物理研究所 | Liquid crystal adaptive retinal imaging optical system for aberration correction with self-regulating visibility |
| CN203506688U (en) * | 2013-09-02 | 2014-04-02 | 王涛 | Sighting target |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH024311A (en) * | 1988-06-13 | 1990-01-09 | Kamiya Sadayoshi | Inspection instrument for contact lens |
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Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5013319A (en) * | 1989-06-05 | 1991-05-07 | Mount Sinai School Of Medicine Of The City University Of New York | Apparatus and method for cornea marking |
| CN2552474Y (en) * | 2002-06-22 | 2003-05-28 | 顾宝文 | Strabismus quantitative photographic analyser |
| CN101411607A (en) * | 2007-10-16 | 2009-04-22 | 张光荣 | Device for photographing conjunctiva and sclera of eyeball |
| CN201308475Y (en) * | 2008-12-02 | 2009-09-16 | 南昌航空大学 | Human eye subjective visual-quality diagnostic apparatus |
| CN101766472A (en) * | 2009-12-31 | 2010-07-07 | 中国科学院长春光学精密机械与物理研究所 | Liquid crystal adaptive retinal imaging optical system for aberration correction with self-regulating visibility |
| CN203506688U (en) * | 2013-09-02 | 2014-04-02 | 王涛 | Sighting target |
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