CN215959810U - Error-eliminating bicylinder lens astigmatism-correcting device and subjective and objective integrated optometry instrument - Google Patents
Error-eliminating bicylinder lens astigmatism-correcting device and subjective and objective integrated optometry instrument Download PDFInfo
- Publication number
- CN215959810U CN215959810U CN202121357258.9U CN202121357258U CN215959810U CN 215959810 U CN215959810 U CN 215959810U CN 202121357258 U CN202121357258 U CN 202121357258U CN 215959810 U CN215959810 U CN 215959810U
- Authority
- CN
- China
- Prior art keywords
- lens
- cylindrical
- cylindrical lens
- astigmatism
- light path
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Eye Examination Apparatus (AREA)
Abstract
The utility model discloses an error-eliminating bicylinder lens correction astigmatism device, an objective and subjective integrated refractometer and an objective and subjective integrated refractometer, and relates to a high-precision subjective and objective inspection ophthalmological refractometer. The device for eliminating the astigmatism correction error of the double cylindrical lenses is characterized in that the two cylindrical lenses are respectively arranged on a focal plane of a 4f system consisting of the two convex lenses, and astigmatism is corrected through the rotation of the two cylindrical lenses along an optical axis; the refractometer also reasonably arranges a main optical path and two branch optical paths of subjective refraction and objective refraction. The advantages are that: the image judgment device for three-dimensional positioning of eyes and objective and subjective diopter measurement are combined into an optometry instrument, and the technical problem that errors are eliminated when two cylindrical mirrors are arranged on a conjugate surface at the same time is solved by using the structure of the two pupil equivalent conjugate surfaces, so that the diopter measurement is fast and accurate in correction. The main light path and the two branch light paths are reasonable in communication design, the path is short, and objective and subjective measurement results obtained by the optometry instrument are more accurate due to small errors generated by the branch light paths.
Description
Technical Field
The utility model relates to the technical field of optical measurement for ophthalmology, in particular to a high-precision optometry device for subjective and objective measurement.
Background
At present, a comprehensive optometry unit commonly used in clinic mainly comprises a combined lens and an optometer, when people perform optometry fitting, the conventional process is that the diopter degrees of the left eye and the right eye are obtained through an optometry glass or an objective optometry unit firstly, then the patient diopter measured on the comprehensive optometry unit is simulated and worn, and an optometrist sends out an adjusting instruction to correct the simulated wearing diopter degrees until the subjective feeling of the patient is optimal.
Chinese patent CN201610303646.6 introduces an optometry method of a comprehensive optometry instrument, the diopter of a patient needs to be measured on an objective optometry instrument in advance, then the patient moves to the comprehensive optometry instrument, the combined lens generates corresponding diopter to complete comprehensive optometry, continuous ametropia diopters are obtained by objective optometry in the optometry process, but subjective optometry can only be performed by step-type selected test lenses, and the difference between the two affects the optometry accuracy; and the astigmatic lens has directionality, and its angle tolerance is less, and the angle error can influence the accuracy of optometry when operator manual inserted sheet.
CN 105942971A describes a system and a method for an automatic phoropter, and the initial diopter of a patient is obtained by measuring in advance on an objective phoropter, and the diopter fine adjustment process is automatically completed on the phoropter. Because the fine adjustment of the diopter of the optometry optical system is finished by depending on the combined lens, the optometry optical system adopts the test lens with discrete power, and the optometry flow has no subjective process, the influence of the human eye nervous system on the visual function is ignored, and the optometry optical system is an undesirable optometry mode. In a common subjective and objective optometry process, objective optometry and subjective optometry are finished on different instruments, and the accuracy of final optometry is influenced by the difference of various aspects such as pupil size, illumination brightness and the like caused by different environments; meanwhile, the manual subjective optometry process is complicated, different vision lenses need to be selected repeatedly, and the tolerance of a tested person can influence the accuracy of final optometry.
Patent publication No. CN201910777661.8 reports a subjective and objective integrated optometry device and method, which combines objective optometry and subjective optometry together and can effectively improve optometry efficiency, but the structure of the device has two defects to influence the measurement accuracy: 1. the axial position of the pupil is not accurately positioned, and when the diopter is larger, whether the pupil is conjugated with the measuring device and the correcting device or not can seriously affect the measuring result. 2. In this patent, the technique for correcting astigmatism is: the single cylindrical mirrors in the cylindrical mirror pair are respectively rotated around the optical axis according to the measured refractive error of the human eyes, and the astigmatism of the human eyes is compensated by adopting a cylindrical mirror synthesis mode. "this correction technique requires that the cylindrical mirror be exactly positioned at the conjugate position with the pupil of the eye to be measured. However, in this patent, two cylindrical mirrors which are separated and overlapped are arranged near the position of the conjugate plane of the pupil of the tested human eye, and because the cylindrical mirrors are thick, the two cylindrical mirrors cannot be positioned at the same conjugate plane at the same time, and no matter whether one cylindrical mirror is positioned at the conjugate plane, the other cylindrical mirror is not positioned at the conjugate plane, or the two cylindrical mirrors are positioned at two sides of the conjugate plane respectively, the technical defect that the two cylindrical mirrors cannot be positioned at the conjugate plane of the pupil at the same time technically exists, and as a result, the error exists between the synthetic astigmatism generated by the two cylindrical mirrors and the astigmatism required to be corrected, and the larger the astigmatism value is, the larger the error is.
Disclosure of Invention
The utility model aims to provide an astigmatism correction device capable of accurately correcting astigmatism of human eyes and a subjective and objective integrated optometry instrument with the astigmatism correction device.
The conception of the utility model is as follows: two convex lenses are added at the pupil conjugate plane to form a 4f system, two pupil conjugate planes are generated, a cylindrical mirror is respectively arranged on the two pupil conjugate planes, the two cylindrical mirrors for correcting astigmatism are positioned on the pupil conjugate plane, the two cylindrical mirrors rotate relatively to each other to combine to generate a continuous astigmatism value and an astigmatism direction, and because the combined value generated by the rotation of the two cylindrical mirrors is larger than the correction range of any one of the cylindrical mirrors, the error generated by the astigmatism correcting scheme of the two cylindrical mirrors which are arranged close to each other and provided by the prior art is eliminated, so that the error-eliminating double-cylindrical-mirror astigmatism correcting device is provided. The bicylindrical lens astigmatism correcting device for eliminating errors is arranged on an optical path between a front device and a visual target imaging device of the subjective and objective integrated optometry instrument, and the optometry instrument becomes the subjective and objective integrated optometry instrument for eliminating the astigmatism correcting errors.
The structure of the utility model is as follows:
the device for eliminating astigmatic error of the double cylindrical lenses comprises two cylindrical lenses and two convex lenses, and is characterized in that: a first cylindrical lens 8, a first convex lens 9, a second convex lens 10 and a second cylindrical lens 11 are sequentially arranged on the same light path, wherein the first convex lens 9 and the second convex lens 10 form a 4f system structure; the directions of the first cylindrical lens 8, the first convex lens 9, the second convex lens 10 and the second cylindrical lens 11 are kept at fixed intervals; the first cylindrical lens 8 is positioned at the focal plane position of the first convex lens 9, and the second cylindrical lens 11 is positioned at the focal plane position of the second convex lens 10; the refractive correction frame is also provided with cylindrical lens drivers 23, and the two cylindrical lens drivers 23 are respectively connected with the first cylindrical lens 8 and the second cylindrical lens 11 and are controlled to rotate along the optical axis.
The structure principle of the astigmatism correcting device and the principle of avoiding errors generated by the synthetic diopter value are as follows:
this correction astigmatism device is on the basis of same center pin of rotation with first cylindrical mirror 8 and second cylindrical mirror 11, produce relative rotation with two cylindrical mirrors, can make up and produce the astigmatism value of minus 2 times to positive 2 times diopter within range, like this, can become the regional value of connecting adjustable range to the fixed value, then can be under the condition of not changing the cylindrical mirror, correct astigmatism to the patient of any astigmatism of regional value, not only made things convenient for the operation, the astigmatism correction parameter diopter error that the embedding position error led to the fact when having reduced the change cylindrical mirror, can also choose the numerical value wantonly in the scope, improve the accuracy nature of measuring diopter.
When the first cylindrical mirror 8 and the second cylindrical mirror 11 rotate on the basis of the same rotation center shaft, the cylindrical mirror driver 23 can be operated manually or electrically, and the rotation angle and the rotation speed of the cylindrical mirror driver 23 are operated during electric adjustment, so that the resultant diopter value of the first cylindrical mirror 8 and the second cylindrical mirror 11 is automatically adjusted, and astigmatism is automatically corrected.
The relative distances among the four components of the first cylindrical lens 8, the first convex lens 9, the second convex lens 10 and the second cylindrical lens 11 are fixed and unchangeable, so that when the first cylindrical lens 8 is positioned at the conjugate plane of the pupil of a certain eye to be detected, the second cylindrical lens 11 is also positioned at the equivalent conjugate plane, and the first cylindrical lens 8 and the second cylindrical lens 11 are equivalent to generate a diopter value at the same pupil conjugate plane position at different positions.
The two cylindrical mirrors of the astigmatism correcting device are respectively positioned on the pupil conjugate surfaces at two different positions to generate a synthesized diopter value, so that the problem that one or both of the two cylindrical mirrors are not positioned on the pupil conjugate surface in the prior art, namely the two cylindrical mirrors disclosed in the Chinese patent 201910777661.8 are arranged at different positions close to each other, is solved, and the problem that the synthesized diopter values generated by the two cylindrical mirrors have errors is also solved.
In addition, the selection range of the first cylindrical mirror 8 and the second cylindrical mirror 11 is as follows: the optical lens can be two cylindrical lenses with positive diopter, can be two cylindrical lenses with negative diopter, or can be one cylindrical lens with positive diopter and the other cylindrical lens with negative diopter; the diopter value range of a single cylindrical mirror is the same as the diopter value range of the cylindrical mirror used in the existing astigmatism detection, but the diopter value of the cylindrical mirror is preferably +5D or-5D. The following are two cylindrical mirror cooperable forms:
one +5D, the other +5D, the resultant diopter value ranging from-10D to + 10D;
one-5D, the other-5D, the resultant diopter value ranging from-10D to + 10D;
one +5D, the other-5D, the resultant diopter value ranges from-10D to + 10D.
Secondly, the subjective and objective integrated optometry instrument with the device for eliminating the astigmatic error corrected by the double cylindrical lenses comprises a front device 18, wherein the front device 18 comprises an eye illuminating lamp 2, a pupil camera 3, a first focusing lens 4, a second focusing lens 5, a first spectroscope 6 and a light source 7; the eye illuminating lamp 2 and the pupil camera 3 are arranged on a human eye contact base frame contacting the human eye 1, and a first focusing lens 4, a second focusing lens 5 and a first spectroscope 6 which are sequentially arranged along an optical axis are arranged on the same straight-line light path, namely on the same focusing light path; the first focusing lens 4 and the second focusing lens 5 form a 4f system structure; the optical paths of the first beam splitter 6 and the light source 7 are light paths for measuring light, and the optical axis of the focusing light path and the optical axis of the light path for measuring form an included angle of 90 degrees; the eye illuminating lamp 2, the pupil camera 3 and the first focusing lens 4 are fixedly connected with the human eye contact base frame;
the method is characterized in that: also comprises a device 19 for eliminating the error of correcting astigmatism of the double cylindrical lens and a visual target inspection device 20,
the optical path structure relations of the preposing device 18, the device 19 for eliminating the double cylindrical lens correction astigmatism error and the visual target inspection device 20 are as follows:
a device 19 for eliminating the astigmatism error corrected by the double-cylindrical lens is arranged between the focusing light path of the front device 18 and the visual target entering light path of the visual target checking device 20, namely, two ends of the astigmatism correcting light path of the device 19 for eliminating the astigmatism error corrected by the double-cylindrical lens are respectively and oppositely connected with the focusing light path of the front device 18 and the visual target entering light path of the visual target checking device 20 to form an optical axis of the same straight line;
the optical path structure of the device 19 for eliminating the astigmatic error of the bi-cylindrical lens: the optical system comprises two cylindrical lenses and two convex lenses, wherein a first cylindrical lens 8, a first convex lens 9, a second convex lens 10 and a second cylindrical lens 11 are sequentially arranged on the same optical path, and the first convex lens 9 and the second convex lens 10 form a 4f system structure; the directions of the first cylindrical lens 8, the first convex lens 9, the second convex lens 10 and the second cylindrical lens 11 are kept at fixed intervals; the first cylindrical lens 8 is positioned at the focal plane position of the first convex lens 9, and the second cylindrical lens 11 is positioned at the focal plane position of the second convex lens 10; the refractive correction frame is also provided with cylindrical lens drivers 23, the two cylindrical lens drivers 23 are respectively and rotatably connected with the first cylindrical lens 8 and the second cylindrical lens 11, and a light path formed by the four components is an astigmatism correction light path;
optical path structure of the optotype inspection device 20: the optical path formed by the four components is a refraction measuring optical path, and the first matched lens 13 and the second matched lens 14 form a 4f system structure; the device also comprises a sighting target imaging mirror 16 and a sighting target display 17, wherein the second spectroscope 12, the sighting target imaging mirror 16 and the sighting target display 17 which are sequentially arranged are arranged on a light path, the light path formed by the three components is a sighting target entering light path, and the included angle of 90 degrees is formed between the optical axis of the refraction measuring light path and the optical axis of the sighting target entering light path;
the mechanical structure relationship of the preposing device 18, the device 19 for eliminating the double cylindrical lens correction astigmatism error and the visual target inspection device 20 is as follows:
three components of the eye illuminating lamp 2, the pupil camera 3 and the first focusing lens 4 of the front device 18 are fixedly arranged on the contact eye frame 21;
the second focusing lens 5 of the preposition device 18, all components of the device 19 for eliminating the double-cylindrical lens correction astigmatism error and all components of the visual target inspection device 20 are fixedly arranged on the refractive correction frame 22 and are fixedly arranged in the components on the refractive correction frame 22, and three optical path optical axes of a focusing optical path optical axis in the preposition device 18, an astigmatism correction optical path optical axis of the device 19 for eliminating the double-cylindrical lens correction astigmatism error and an optical path optical axis of a visual target entering optical axis of the visual target inspection device 20 are on the same straight optical path optical axis;
the eye contact frame 21 is fixedly connected with the optometry unit integral frame 24, and the refraction correction frame 22 is connected with the optometry unit integral frame 24 in a sliding or rotating mode.
The refractometer has the characteristics and advantages that the refractometer has the following characteristics and advantages besides the characteristics and advantages of the structure principle of the astigmatism correcting device and the principle of avoiding errors caused by the synthetic diopter value:
the optometry instrument comprises a main light path and two branch light paths, wherein the main light path is a light path for eyes to directly look at an image of a visual target display 17, namely the main light path comprises a focusing light path, an astigmatism correcting light path and a visual target entering light path; the two branch optical paths are optical paths for measuring objective ametropia, and the other branch optical path is a branch optical path for the light source 7 for measurement to enter the main optical path through the spectroscope; the other is a branch optical path of the fundus backward reflected light carrying the ametropia information of the eye to the wavefront sensor 15 through the spectroscope. The light source 7 for measurement and the wavefront sensor 15 are respectively communicated with the main light path through only one spectroscope, so that the light splitting refraction error can be reduced, the coating requirement of single refraction on the spectroscope is lower, and the device cost can be greatly saved due to the structural advantage. The existing Chinese patent 201910777661.8 has two branch optical paths respectively entering the main optical path after reflection and refraction, and the refraction errors of the branch optical paths are amplified by continuous multiple refraction, and the errors cannot be clarified and are generated by the refraction of the spectroscope, so that a correction method is not easy to find and the errors are not easy to correct; and the light source for measurement and the sighting target light path are combined into a light path through the spectroscope, the coating film is strictly required in the selection of the spectroscope, and the design and processing cost is high. Therefore, compared with the Chinese patent 201910777661.8, the number of stages for the branch optical path to enter the main optical path is less and the structure is more reasonable.
The main light path of the optometry instrument is technically characterized in that only one linear light path central line is arranged, namely the light path central line of the main light path, namely the optical axis of the main light path, is a straight line and is not bent.
The utility model has the advantages that: the utility model solves the problem that the two cylindrical lenses can not be arranged on the conjugate surface at the same time by using the structure provided with the two pupil conjugate surfaces, obtains the synthetic diopter technical scheme without error, solves the problem that the accurate diopter parameter can be continuously changed without replacing the cylindrical lens when the astigmatism is corrected, and ensures that the diopter measurement is fast and accurate. The main light path and the two branch light paths are reasonably communicated, so that the channel paths of the branch light paths are short, and objective and subjective measurement results obtained by the optometry instrument are more accurate due to small errors generated by the branch light paths.
Drawings
FIG. 1 is a schematic diagram of an optical configuration of the present invention using two external fixtures, a contact eye frame and a refractive correction frame, to divide the positional relationship of all optical components;
FIG. 2 is a schematic diagram of the optical structure of the present invention, which uses three optical purposes, namely, a front device, a device for eliminating the astigmatic error of the bi-cylindrical lens, and a visual target inspection device to divide the positional relationship of all optical components.
The eye-focusing device comprises a human eye 1, an eye-illuminating lamp 2, a pupil camera 3, a first focusing lens 4, a second focusing lens 5, a first spectroscope 6, a light source for measurement 7, a first cylindrical lens 8, a first convex lens 9, a second convex lens 10, a second cylindrical lens 11, a second spectroscope 12, a first matching lens 13, a second matching lens 14, a optotype generator 15, a optotype imaging lens 16, a optotype detecting display 17, a front-end device 18, a device for eliminating astigmatism error of correction by double cylindrical lenses 19, a sighting target inspection device 20, a contact eye frame 21, a refraction correction frame 22, a cylindrical lens driver 23 and an optometry integrated frame 24.
Detailed Description
EXAMPLE 1 apparatus for eliminating astigmatic error of Bicylindrical lens correction
As shown in fig. 1 and 2.
[ A structure of an astigmatism correcting device: including two cylindrical mirrors and two convex lens, its characterized in that: a first cylindrical lens 8, a first convex lens 9, a second convex lens 10 and a second cylindrical lens 11 are sequentially arranged on the same light path, wherein the first convex lens 9 and the second convex lens 10 form a 4f system structure; the directions of the first cylindrical lens 8, the first convex lens 9, the second convex lens 10 and the second cylindrical lens 11 are kept at fixed intervals; the first cylindrical lens 8 is positioned at the focal plane position of the first convex lens 9, and the second cylindrical lens 11 is positioned at the focal plane position of the second convex lens 10; the refractive correction frame is also provided with cylindrical lens drivers 23, and the two cylindrical lens drivers 23 are respectively connected with the first cylindrical lens 8 and the second cylindrical lens 11 and are controlled to rotate along the optical axis.
A pipe with openings at two ends is used as a refractive correction frame, a first cylindrical lens 8, a first convex lens 9, a second convex lens 10 and a cylindrical lens driver 23 are respectively and fixedly connected with the refractive correction frame, the first cylindrical lens 8 and a second cylindrical lens 11 are respectively and rotatably connected with the two cylindrical lens drivers 23, and the cylindrical lens drivers 23 are fixedly connected with the refractive correction frame;
[ two ] the parameters of the components were selected as follows:
the first cylindrical mirror 8 is selected to be + 5D;
the first convex lens 9 is + 20D;
the second convex lens 10 is + 20D;
the second cylindrical lens 11 is selected to be + 5D;
the first cylindrical mirror 8 and the second cylindrical mirror 11 can generate a combined astigmatism in the range of-10D to + 10D.
The position arrangement of the first cylindrical lens 8, the first convex lens 9, the second convex lens 10 and the second cylindrical lens 11 meets the 4f system arrangement in geometric optics, so that the first convex lens 9 and the second convex lens 10 form a relay optical path.
Embodiment 2 device for eliminating astigmatic error of bi-cylindrical lens
As shown in the figures 1 and 2, the above-mentioned figures,
[ A structure of an astigmatism correcting device: the same as in example 1.
[ two ] the parameters of the components were selected as follows:
the first cylindrical mirror 8 is-5D;
the first convex lens 9 is + 20D;
the second convex lens 10 is + 20D;
the second cylindrical lens 11 is selected as-5D;
the first cylindrical mirror 8 and the second cylindrical mirror 11 can generate a combined astigmatism in the range of-10D to + 10D.
The position arrangement of the first cylindrical lens 8, the first convex lens 9, the second convex lens 10 and the second cylindrical lens 11 meets the 4f system arrangement in geometric optics, so that the first convex lens 9 and the second convex lens 10 form a relay optical path.
Embodiment 3 device for eliminating astigmatic error of double cylindrical mirrors
As shown in the figures 1 and 2, the above-mentioned figures,
[ A structure of an astigmatism correcting device: the same as in example 1.
[ two ] the parameters of the components were selected as follows:
the first cylindrical mirror 8 is selected to be + 5D;
the first convex lens 9 is + 20D;
the second convex lens 10 is + 20D;
the second cylindrical lens 11 is selected as-5D;
the first cylindrical mirror 8 and the second cylindrical mirror 11 can generate a combined astigmatism in the range of-10D to + 10D.
The position arrangement of the first cylindrical lens 8, the first convex lens 9, the second convex lens 10 and the second cylindrical lens 11 meets the 4f system arrangement in geometric optics, so that the first convex lens 9 and the second convex lens 10 form a relay optical path.
EXAMPLE 4 Objective and Objective Integrated Optometer with device for eliminating astigmatic error of Bicylindrical lens correction
As shown in fig. 1 and 2.
The subjective and objective integrated optometry unit with the device for eliminating the astigmatic error of the double cylindrical lenses comprises a preposed device 18, wherein the preposed device 18 comprises an eye illuminating lamp 2, a pupil camera 3, a first focusing lens 4, a second focusing lens 5, a first spectroscope 6 and a light source 7; the eye illuminating lamp 2 and the pupil camera 3 are arranged on a human eye contact base frame contacting the human eye 1, and a first focusing lens 4, a second focusing lens 5 and a first spectroscope 6 which are sequentially arranged along an optical axis are arranged on the same straight-line light path, namely on the same focusing light path; the first focusing lens 4 and the second focusing lens 5 form a 4f system structure; the optical paths of the first beam splitter 6 and the light source 7 are light paths for measuring light, and the optical axis of the focusing light path and the optical axis of the light path for measuring form an included angle of 90 degrees; the eye illuminating lamp 2, the pupil camera 3 and the first focusing lens 4 are fixedly connected with the human eye contact base frame;
the method is characterized in that: also comprises a device 19 for eliminating the error of correcting astigmatism of the double cylindrical lens and a visual target inspection device 20,
the optical path structure relations of the preposing device 18, the device 19 for eliminating the double cylindrical lens correction astigmatism error and the visual target inspection device 20 are as follows:
a device 19 for eliminating the astigmatism error corrected by the double-cylindrical lens is arranged between the focusing light path of the front device 18 and the visual target entering light path of the visual target checking device 20, namely, two ends of the astigmatism correcting light path of the device 19 for eliminating the astigmatism error corrected by the double-cylindrical lens are respectively and oppositely connected with the focusing light path of the front device 18 and the visual target entering light path of the visual target checking device 20 to form an optical axis of the same straight line;
the optical path structure of the device 19 for eliminating the astigmatic error of the bi-cylindrical lens: the optical system comprises two cylindrical lenses and two convex lenses, wherein a first cylindrical lens 8, a first convex lens 9, a second convex lens 10 and a second cylindrical lens 11 are sequentially arranged on the same optical path, and the first convex lens 9 and the second convex lens 10 form a 4f system structure; the directions of the first cylindrical lens 8, the first convex lens 9, the second convex lens 10 and the second cylindrical lens 11 are kept at fixed intervals; the first cylindrical lens 8 is positioned at the focal plane position of the first convex lens 9, and the second cylindrical lens 11 is positioned at the focal plane position of the second convex lens 10; the refractive correction frame is also provided with cylindrical lens drivers 23, the two cylindrical lens drivers 23 are respectively and rotatably connected with the first cylindrical lens 8 and the second cylindrical lens 11, and a light path formed by the four components is an astigmatism correction light path;
optical path structure of the optotype inspection device 20: the optical path formed by the four components is a refraction measuring optical path, and the first matched lens 13 and the second matched lens 14 form a 4f system structure; the device also comprises a sighting target imaging mirror 16 and a sighting target display 17, wherein the second spectroscope 12, the sighting target imaging mirror 16 and the sighting target display 17 which are sequentially arranged are arranged on a light path, the light path formed by the three components is a sighting target entering light path, and the included angle of 90 degrees is formed between the optical axis of the refraction measuring light path and the optical axis of the sighting target entering light path;
the mechanical structure relationship of the preposing device 18, the device 19 for eliminating the double cylindrical lens correction astigmatism error and the visual target inspection device 20 is as follows:
three components of the eye illuminating lamp 2, the pupil camera 3 and the first focusing lens 4 of the front device 18 are fixedly arranged on the contact eye frame 21;
the second focusing lens 5 of the preposition device 18, all components of the device 19 for eliminating the double-cylindrical lens correction astigmatism error and all components of the visual target inspection device 20 are fixedly arranged on the refractive correction frame 22 and are fixedly arranged in the components on the refractive correction frame 22, and three optical path optical axes of a focusing optical path optical axis in the preposition device 18, an astigmatism correction optical path optical axis of the device 19 for eliminating the double-cylindrical lens correction astigmatism error and an optical path optical axis of a visual target entering optical axis of the visual target inspection device 20 are on the same straight optical path optical axis;
the eye contact frame 21 is fixedly connected with the optometry unit integral frame 24, and the refraction correction frame 22 is connected with the optometry unit integral frame 24 in a sliding or rotating mode.
The optotype display 17 may be a microdisplay with a resolution of 800 x 600;
the sighting target imaging lens 16 can select a lens with a focal length of 200 mm;
the first cylindrical mirror 8 can be a +5D cylindrical mirror;
the first convex lens 9 can be a +20D convex lens;
the second convex lens 10 can be a +20D convex lens;
the second cylindrical lens 11 can be a +5D cylindrical lens;
the first cylindrical mirror 8 and the second cylindrical mirror 11 can generate a combined astigmatism in the range of-10D to + 10D.
The position arrangement of the first cylindrical lens 8, the first convex lens 9, the second convex lens 10 and the second cylindrical lens 11 meets the 4f system arrangement in geometric optics, so that the first convex lens 9 and the second convex lens 10 form a relay optical path.
The wavefront sensor 15 may be selected from a microlens array with an array number of 20 × 20, a sub-aperture of 200 μm, and a focal length of 10 mm;
the first matching lens 13 can be a +40D convex lens;
the second matching lens 14 can be a +40D convex lens;
the light source 7 can be an LD light source with the wavelength of 840 nanometers;
the first focusing lens 4 can be a +20D convex lens;
the second focusing lens 5 can be a +20D convex lens;
the device 19 for eliminating the astigmatic error of the bi-cylindrical lens has the following structure: a pipe with two open ends is used as a refractive correction frame, the first cylindrical mirror 8 is rotationally connected with a cylindrical mirror driver 23, the cylindrical mirror driver 23 is fixedly connected with the refractive correction frame, and the second cylindrical mirror 11 is rotationally connected with the cylindrical mirror driver 23; after the ametropia measurement is finished, the rotation angles of the first cylindrical mirror 8 and the second cylindrical mirror 11 are respectively calculated according to the measurement result, and the cylindrical mirror driver is manually or driven to automatically rotate to the position to finish the astigmatism correction.
The components in the contact-eye frame 21 are arranged: according to the mode of the prior art optometry instrument, three parts of an eye illuminating lamp 2, a pupil camera 3 and a first focusing lens 4 of a front device 18 are fixedly arranged on a contact eye frame 21; the positions of the components are arranged according to the mode of the prior art eye refractometer, and the eye contact frame 21 is fixed on the integral frame 24 of the refractometer.
Component arrangement in the refractive correction frame 22: the second focusing lens 5, the first spectroscope 6, the light source 7 of the front device 18, and all the components of the device 19 for correcting astigmatic error by means of the bi-cylindrical lens and all the components of the optotype examination device 20 are fixedly disposed on a refractive correction frame 22, and the refractive correction frame 22 is connected to an optometry instrument integral frame 24 in a sliding or rotating manner. The focusing optical path in the pre-device 18, the astigmatism correcting optical path of the device 19 for eliminating the astigmatism error of the bi-cylindrical lens correction and the visual target of the visual target inspection device 20 are made to enter the optical path to be coaxial.
Claims (2)
1. Error elimination bi-cylindrical lens correction astigmatism device, including two cylindrical lenses and two convex lens, its characterized in that: a first cylindrical lens (8), a first convex lens (9), a second convex lens (10) and a second cylindrical lens (11) are sequentially arranged on the same light path, wherein the first convex lens (9) and the second convex lens (10) form a 4f system structure; the directions of the first cylindrical lens (8), the first convex lens (9), the second convex lens (10) and the second cylindrical lens (11) are kept at fixed intervals; the first cylindrical lens (8) is positioned at the focal plane position of the first convex lens (9), and the second cylindrical lens (11) is positioned at the focal plane position of the second convex lens (10); the refractive correction frame is also provided with cylindrical lens drivers (23), and the two cylindrical lens drivers (23) are respectively connected with the first cylindrical lens (8) and the second cylindrical lens (11) and are controlled to rotate along the optical axis.
2. The subjective and objective integrated optometry unit with the error-eliminating double-cylindrical-surface lens astigmatism-correcting device comprises a front device (18), wherein the front device (18) comprises an eye illuminating lamp (2), a pupil camera (3), a first focusing lens (4), a second focusing lens (5), a first spectroscope (6) and a light source (7); the eye illuminating lamp (2) and the pupil camera (3) are arranged on a human eye contact base frame which contacts human eyes (1), and a first focusing lens (4), a second focusing lens (5) and a first beam splitter (6) which are sequentially arranged along an optical axis are arranged on the same straight-line light path, namely on the same focusing light path; the first focusing lens (4) and the second focusing lens (5) form a 4f system structure; the optical path of the first beam splitter (6) and the light source (7) is a light source optical path for measurement, and the optical axis of the focusing optical path and the optical axis of the light source optical path for measurement form an included angle of 90 degrees; the eye illuminating lamp (2), the pupil camera (3) and the first focusing lens (4) are fixedly connected with the human eye contact base frame;
the method is characterized in that: also comprises a device (19) for eliminating the astigmatism error of the double cylindrical lens correction and a visual target inspection device (20),
the optical path structure relations of the preposing device (18), the device (19) for eliminating the double cylindrical lens correction astigmatism error and the visual target inspection device (20) are as follows:
a device (19) for eliminating the astigmatic error of the double cylindrical lens is arranged between the focusing light path of the front device (18) and the visual target entering light path of the visual target inspection device (20), namely, two ends of the astigmatic correcting light path of the device (19) for eliminating the astigmatic error of the double cylindrical lens are respectively and oppositely connected with the focusing light path of the front device (18) and the visual target entering light path of the visual target inspection device (20) to form the same straight optical axis;
the optical path structure of the device (19) for eliminating the astigmatic error of the bi-cylindrical lens comprises: the optical system comprises two cylindrical lenses and two convex lenses, wherein a first cylindrical lens (8), a first convex lens (9), a second convex lens (10) and a second cylindrical lens (11) are sequentially arranged on the same optical path, and the first convex lens (9) and the second convex lens (10) form a 4f system structure; the directions of the first cylindrical lens (8), the first convex lens (9), the second convex lens (10) and the second cylindrical lens (11) are kept at fixed intervals; the first cylindrical lens (8) is positioned at the focal plane position of the first convex lens (9), and the second cylindrical lens (11) is positioned at the focal plane position of the second convex lens (10); the refractive correction frame is also provided with cylindrical lens drivers (23), the two cylindrical lens drivers (23) are respectively and rotatably connected with the first cylindrical lens (8) and the second cylindrical lens (11), and a light path formed by the four components is an astigmatism correction light path;
optical path structure of visual target inspection device (20): the optical path formed by the four components is a refraction measuring optical path, and the first matched lens (13) and the second matched lens (14) form a 4f system structure; the device also comprises a sighting target imaging lens (16) and a sighting target display (17), wherein a second spectroscope (12), the sighting target imaging lens (16) and the sighting target display (17) which are sequentially arranged are arranged on a light path, the light path formed by the three components is a sighting target entering light path, and the included angle of 90 degrees is formed between the optical axis of the refraction measuring light path and the optical axis of the sighting target entering light path;
the mechanical structure relations of the preposing device (18), the device (19) for eliminating the astigmatic error of the bi-cylindrical lens and the visual target inspection device (20) are as follows:
three components of an eye illuminating lamp (2), a pupil camera (3) and a first focusing lens (4) of the front device (18) are fixedly arranged on the contact eye frame (21);
the second focusing lens (5) of the preposing device (18), all components of the device (19) for eliminating the double-cylindrical lens correction astigmatism error and all components of the visual target inspection device (20) are fixedly arranged on the refractive correction frame (22) and are fixedly arranged in the components on the refractive correction frame (22), and the optical axes of the focusing optical path in the preposing device (18), the astigmatism correction optical path of the device (19) for eliminating the double-cylindrical lens correction astigmatism error and the visual target entering optical path of the visual target inspection device (20) are on the same straight optical path;
the contact eye frame (21) is fixedly connected with the integral stand (24) of the optometry instrument, and the refractive correction frame (22) is connected with the integral stand (24) of the optometry instrument in a sliding or rotating mode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121357258.9U CN215959810U (en) | 2021-06-18 | 2021-06-18 | Error-eliminating bicylinder lens astigmatism-correcting device and subjective and objective integrated optometry instrument |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121357258.9U CN215959810U (en) | 2021-06-18 | 2021-06-18 | Error-eliminating bicylinder lens astigmatism-correcting device and subjective and objective integrated optometry instrument |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215959810U true CN215959810U (en) | 2022-03-08 |
Family
ID=80578179
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121357258.9U Active CN215959810U (en) | 2021-06-18 | 2021-06-18 | Error-eliminating bicylinder lens astigmatism-correcting device and subjective and objective integrated optometry instrument |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215959810U (en) |
-
2021
- 2021-06-18 CN CN202121357258.9U patent/CN215959810U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107920731B (en) | Improved objective comprehensive optometry instrument | |
| US20140176904A1 (en) | Ophthalmic Aberrometer Capable of Subjective Refraction | |
| IL160347A (en) | Device for measuring aberrations in an eye-type system | |
| CN110367924B (en) | Subjective and objective integrated precise optometry device and optometry method | |
| JP2004535881A (en) | Measuring the refractive properties of the human eye | |
| CN113440099B (en) | Comprehensive human eye vision inspection device and method | |
| US8272740B2 (en) | Device and method for calibrating retinoscopes | |
| CN220158218U (en) | Large-view-field optometry device with binocular automatic alignment device | |
| CN215959810U (en) | Error-eliminating bicylinder lens astigmatism-correcting device and subjective and objective integrated optometry instrument | |
| CN113425239A (en) | Error-eliminating bicylinder lens astigmatism-correcting device and subjective and objective integrated optometry instrument | |
| CN111419170A (en) | Binocular vision screening instrument and control method thereof | |
| JP5237869B2 (en) | Model eye | |
| US20110261323A1 (en) | Device and method for calibrating retinoscopes | |
| CN111557637A (en) | Ophthalmologic measuring system | |
| CN219962838U (en) | Eyeball comprehensive diopter rapid measurement device | |
| CN116784790B (en) | Large-view-field optometry device with binocular automatic alignment device | |
| JP7279349B2 (en) | ophthalmic equipment | |
| CN219021146U (en) | Aberrometer for measuring human eye regulation state | |
| CN215584104U (en) | Subjective and objective integrated precise optometry device with stray light eliminating mechanism | |
| CN116746876A (en) | Vision detection device and method | |
| WO2020226023A1 (en) | Optometric device | |
| WO2008000008A2 (en) | Achromatising triplet for the human eye | |
| JPH0315447B2 (en) | ||
| CN116712029A (en) | Device and method for detecting ametropia | |
| JP2022157347A (en) | Ophthalmologic apparatus |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |