CN2157740Y - Certified standard device for subjective optometer - Google Patents
Certified standard device for subjective optometer Download PDFInfo
- Publication number
- CN2157740Y CN2157740Y CN 93216846 CN93216846U CN2157740Y CN 2157740 Y CN2157740 Y CN 2157740Y CN 93216846 CN93216846 CN 93216846 CN 93216846 U CN93216846 U CN 93216846U CN 2157740 Y CN2157740 Y CN 2157740Y
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- CN
- China
- Prior art keywords
- eyepiece
- standard
- eye
- utility
- vision tester
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- Expired - Fee Related
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Abstract
The utility model belongs to an optic device, which is a standard device used for testing a subjective vision tester. The utility model is composed of a standard simulative eye, an ocular reticle and a telescopic eyepiece which are installed on an eyepiece barrel in a coaxial mode, wherein, the bottom end of the simulative eye is appressed with the ocular reticle. When the utility model works, the simulative eye which corresponds to the tested point of the vision tester is inserted, the objective of the vision tester is observed from the standard eyepiece to enable the objective to be clear. At the time, the difference of the indicated value of the vision tester and the valve of the standard device is the error of the tested point of the vision tester.
Description
This utility model belongs to optics, is a kind of standard that is used to examine and determine subjective formula eye refractor.
Subjective formula refractor is to be provided with a movable lens between object lens and eyepiece, penetrates the light that comes by graticle and enters human eye through object lens, movable lens and eyepiece, imaging on retina.Ametropia is carried out optometry is: mobile movable lens, make on the retina form clearly as, the distance that moves according to movable lens is obtained and is needed the corrigent number of degrees.Subjective formula refractor examined and determine be meant its movable lens is examined and determine at the accuracy of the diopter indicating value of each location point.At present, the calibrating of subjective formula refractor is had two kinds of methods, a kind of is the zero-bit of determining movable lens with accurate diopter cylinder, and the displacement of reuse vernier caliper measurement movable lens is calculated diopter according to this and show value compares.Obviously, this method is trouble, but also will open the protecting cover of refractor, and its accuracy is also doubtful.Another kind is one group and examines and determine before being placed on diopter cylinder with the standard eyeglass.This method requires the back summit of standard eyeglass should be placed on the assigned position at refractor emergent pupil place, so need repeatedly change connector, operation is extremely inconvenient.In addition, the standard eyeglass designs for lens meter, and radius of curvature is bigger, costs an arm and a leg, and its image quality is relatively poor when being used for examining and determine refractor.
The purpose of this utility model provides a kind of standard verification device of subjective formula refractor simple in structure, easy to use.
The solution that realizes this utility model purpose is: the standard verification device of the subjective formula refractor that is provided, form by the coaxial standard simulation eye that is installed in the bottom polishing on the eyepiece stalk, eyepiece graticule and the eyepiece that can relative eyepiece stalk stretches, wherein " ten " word line of eyepiece graticule is by a side of simulated eye, and is close to the bottom of simulated eye.
Below in conjunction with accompanying drawing content of the present utility model is described in detail.
Accompanying drawing is a structure chart of the present utility model.
As shown in the figure: standard simulation eye 1 is made by lucite, the two ends polishing, and there is protective case 2 outside.Standard simulation eye is by international standard and according to formula P=1000((n)/(s)-(n-1)/(r)) make the focal power of p-simulated eye in the formula; The refractive index of n-simulated eye material; The length of s-simulated eye; The radius of curvature of r-simulated eye front end generally equals the mean radius of curvature of eye cornea.Therefore, after the radius of curvature r of the material of simulated eye and front end face determined, the focal power p of simulated eye was just determined by its length s.Graticle 3 is fixed on the front end of eyepiece stalk 4, and its left surface is carved with " ten " word line, and simulated eye 1 inserts its bottom, eyepiece stalk 4 back should be adjacent to graticle.Eyepiece 5 is made up of retracting cylinder 6 and eyeglass 7,8, and retracting cylinder 6 inserts from the rear end of eyepiece stalk 4.When using this standard that subjective formula refractor is examined and determine, should regulate retracting cylinder 6 earlier, after making " ten " groove on the graticle 3 clear retracting cylinder is fixed, to insert in the eyepiece stalk with the pairing simulated eye of refractor test point then, observe the target of refractors again from eyepiece 5, and regulate refractor and make target as clear, this moment refractor indicating value and the difference of the value of the simulated eye error that is this test point.
As from the foregoing, the use of this standard is all very convenient with the calibrating operation, and structure is also simpler, and its cost is far below the standard eyeglass.This standard adopts adjustable eyepiece, thereby has reduced observer's subjective error.In addition, this standard has adopted simulated eye, thereby the measurement criteria of subjective formula refractor and objective type computer refractometer can be united.
Claims (1)
1, a kind of standard verification device of subjective formula refractor, it is characterized in that forming by the coaxial standard simulation eye (1) that is installed in the bottom polishing on the eyepiece stalk (4), eyepiece graticule (3) and the eyepiece (5) that can relative eyepiece stalk stretches, wherein " ten " word groove of eyepiece graticule (3) is by a side of simulated eye (1), and is close to the bottom of simulated eye.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 93216846 CN2157740Y (en) | 1993-06-23 | 1993-06-23 | Certified standard device for subjective optometer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 93216846 CN2157740Y (en) | 1993-06-23 | 1993-06-23 | Certified standard device for subjective optometer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2157740Y true CN2157740Y (en) | 1994-03-02 |
Family
ID=33796911
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 93216846 Expired - Fee Related CN2157740Y (en) | 1993-06-23 | 1993-06-23 | Certified standard device for subjective optometer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2157740Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105549131A (en) * | 2016-01-29 | 2016-05-04 | 中国计量科学研究院 | Series verification eyeglasses for checking contact lens geometrical parameter measurement instrument |
-
1993
- 1993-06-23 CN CN 93216846 patent/CN2157740Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105549131A (en) * | 2016-01-29 | 2016-05-04 | 中国计量科学研究院 | Series verification eyeglasses for checking contact lens geometrical parameter measurement instrument |
| CN105549131B (en) * | 2016-01-29 | 2017-12-08 | 中国计量科学研究院 | A kind of serial Test lenses for being used to examine contact lense geometric parameter measurement instrument |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |