Disclosure of Invention
The invention aims to provide an ophthalmic vision examination data collection and analysis system which solves the problems in the background technology.
In order to achieve the above purpose, the invention provides a technical scheme that the system comprises an inspection data collection module, a correction calculation analysis module and a result display module, wherein the correction calculation analysis module comprises a refractive error base correction unit, an eye movement capturing precision evaluation unit and a refractive error positive feedback adjustment correction unit;
The specific implementation steps are as follows:
step one, checking and collecting the refractive error and the eye movement behavior of the current patient by using the checking data collecting module, and storing the checking data in a system;
Step two, calculating and outputting the correcting lens degree JD by using the ametropia basic correcting unit, and storing the correcting lens degree JD in a system;
Step three, calculating an output eye movement capturing precision evaluation value Y based on the correction lens degree JD by using an eye movement capturing precision evaluation unit, and storing the evaluation value Y in a system;
Step four, based on the eye movement capturing precision evaluation value Y, using a positive feedback adjustment and correction unit of refractive errors to sequentially calculate and output a feedback adjustment coefficient T and an updated correction lens degree JDnew, and storing the feedback adjustment coefficient T and the updated correction lens degree JDnew in a system;
Step five, using the result display module to display the current correction and the corrected lens degree JDnew after updating the next optometry to the current patient, and storing the correction lens degree JDnew in a system;
The equipment used by the data collection module comprises an optometry instrument, a laser range finder, a cornea topography instrument, a cornea refractive index measuring instrument and eye movement tracking equipment;
the equipment used by the correction calculation analysis module comprises a computer and a software system;
the device used by the result display module comprises a visual display device.
Optionally, the calculation formula of the refractive error basic correction unit is as follows:
;
Wherein:
JD is the corrective lens power;
QD is sphere power, QD reflects the extent of near-sightedness;
SD is cylinder power, SD reflects the degree of astigmatism;
a is the astigmatism axis;
z is the refractive index of the cornea;
B1 is a first radius of curvature of the cornea, B2 is a second radius of curvature of the cornea, and B1 and B2 reflect two principal radii of curvature of the anterior surface of the cornea;
m is the distance between the target object and m reflects the distance between the detection target and the eyes of the patient.
Optionally, the sphere power QD measures the power of myopia and hyperopia, and the specific measurement process is as follows:
The patient sits in front of the optometry instrument, the chin is placed on the bracket, the forehead is clung to the instrument, the eyes aim at the vision hole of the optometry instrument, the optometry instrument emits light during detection, the light is focused on the retina by utilizing the combination of the lens and the reflector, the refraction state of the eyes is measured, and the sphere power QD is obtained;
The cylinder power SD measures the power of astigmatism, and the specific measurement procedure is as follows:
In the measuring process, the optometry instrument simulates light rays in different directions and angles to enter eyes, observes focusing conditions of the light rays on retina, analyzes focusing positions and shapes of the light rays, and detects cylinder power SD and astigmatism axis position A;
The specific measuring process of the distance m of the target object is as follows:
In the optometry process of the optometry instrument, an optometrist sets an object with a known distance as an observation target, and uses a laser range finder to measure the distance between the observation target and eyes of a patient;
the specific measurement process of the first curvature radius B1 of the cornea and the second curvature radius B2 of the cornea is as follows:
the corneal topography instrument utilizes a laser projection technology to project light onto the cornea surface, observes the reflection condition of the light on the cornea surface, analyzes the position and the shape of the reflected light, draws the topography of the cornea surface, and detects the first curvature radius B1 of the cornea and the second curvature radius B2 of the cornea.
Optionally, the calculation formula of the eye movement capturing precision evaluation unit is as follows:
;
;
Wherein:
y is an eye movement capturing precision evaluation value;
f is the instrument resolution, F reflects the resolution of the eye tracking device;
W is eye movement catching error;
X0 is the set track X axis, Y0 is the set track Y axis, (X0,Y0) reflects one of the set points of the eye movement tracking track;
Xi is the ith eye movement track X axis, Yi is the ith eye movement track Y axis, (Xi,Yi) reflects the patient eye movement fixed point corresponding to the (X0,Y0) track fixed point in the set eye movement track;
s is eye movement capturing time.
Optionally, the calculation formula of the correction unit based on positive feedback adjustment of refractive errors is as follows:
;
Wherein:
T is a feedback adjustment coefficient;
Yprev is the last eye movement capturing accuracy evaluation value;
JDprev is the last corrective lens power.
Optionally, based on the feedback adjustment coefficient T, an adjustment calculation formula of the correction lens power JD is as follows:
JDnew=JD+T;
JDnew is the updated corrective lens power.
Optionally, in the next ophthalmic vision examination, the updated correcting lens power JDnew is directly input to the estimated eye movement capturing precision unit, and JD is replaced, specifically as follows:
;
And in the next positive feedback adjustment correction unit for refractive error, JDprev=JDnew.
Compared with the prior art, the invention has the following beneficial effects:
1. The invention integrates high-precision ophthalmic examination equipment and an eye movement tracking system, so that the system can comprehensively collect the ametropia and eye movement behaviors of a patient, and provides a more accurate and comprehensive basis for subsequent calculation and analysis.
2. According to the invention, the refractive error basic correction unit is adopted, the eye movement capturing precision unit and the refractive error positive feedback adjustment correction unit are evaluated to carry out scientific calculation, the influence of eye movement on visual inspection is fully considered on the basis of taking the refractive error into consideration, the accuracy and the reliability of a correction scheme are improved, and meanwhile, the system can dynamically adjust and optimize according to the eye movement behaviors of a patient by calculating the feedback adjustment coefficient T.
3. The invention calculates the feedback adjustment coefficient T and applies the feedback adjustment coefficient T to the next calculation of the correction degree of the ametropia, namely, the correction lens degree JDnew after updating, so that the system establishes an effective feedback mechanism, the system can be timely adjusted and optimized according to the actual condition of a patient, the correction effect and satisfaction are improved, the system forms a complete closed loop system, the continuous monitoring and optimization of the vision condition of the patient can be realized, and the system can continuously optimize the correction scheme and improve the vision level and life quality of the patient by continuously collecting and analyzing data.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The system is different from the existing system for collecting and analyzing the ophthalmic visual inspection data, the existing system for collecting and analyzing the ophthalmic visual inspection data ignores the importance of the eye movement behavior data, so that the correction scheme cannot fully consider the individual difference and dynamic change of a patient and lacks an effective feedback mechanism, the correction degree calculation of the ametropia cannot be optimized in time according to the actual condition of the patient, the correction degree calculation of the ametropia is improved continuously by the algorithm unit according to the precision change of the eye movement behavior capture, the correction effect is improved, and meanwhile, the formed feedback circulation mechanism also enables the system to have self-learning and optimizing capabilities and can adapt to the individual difference and the illness state change of the patient continuously.
Referring to fig. 1 to 4, the present embodiment provides an ophthalmic vision examination data collection and analysis system, which includes an examination data collection module, a correction calculation analysis module and a result display module, wherein the correction calculation analysis module includes a refractive error base correction unit, an eye movement capturing precision evaluation unit and a refractive error positive feedback adjustment correction unit;
The specific implementation steps are as follows:
Step one, checking and collecting the refractive error and the eye movement behavior of the current patient by using a checking data collecting module, and storing the checking data in a system;
step two, calculating and outputting the correcting lens degree JD by using the ametropia basic correcting unit, and storing the correcting lens degree JD in a system;
Step three, calculating an output eye movement capturing precision evaluation value Y based on the correction lens degree JD by utilizing an eye movement capturing precision evaluation unit, and storing the evaluation value Y in a system;
Step four, based on the eye movement capturing precision evaluation value Y, using a positive feedback adjustment correction unit of the refractive error to sequentially calculate and output a feedback adjustment coefficient T and an updated correction lens degree JDnew, and storing the feedback adjustment coefficient T and the updated correction lens degree JDnew in a system;
Step five, using a result display module to display the current correction and the corrected lens degree JDnew after updating the next refraction to the current patient, and storing the correction lens degree JDnew in a system;
The equipment used by the data collection module comprises an optometry instrument, a laser range finder, a cornea topography instrument, a cornea refractive index measuring instrument and eye movement tracking equipment;
The equipment used by the correction calculation analysis module comprises a computer and a software system;
The devices used by the results presentation module include visual presentation devices.
In this embodiment, the system plays an important role in the ophthalmic vision examination data collection and analysis system through three algorithm units, and cooperates with each other to form a closed loop system, and combines the three operation results of JD, Y and T, so that the system not only can improve the accuracy and reliability of the correction scheme, but also can realize continuous monitoring and optimization of the vision condition of the patient, wherein JD is the correction lens degree, the degree can correct the problem of ametropia of the patient, so that the patient can clearly see the target object, Y is the evaluation value of the eye movement capturing accuracy, the accuracy of the correction degree is ensured by evaluating the accuracy of eye movement behavior capturing, the higher the value is the more accurate the eye movement capturing, the more accurate the parameter of the eye movement capturing is, the dynamic adjustment of the correction lens degree is realized, the correction effect is continuously optimized in the practical application, the accuracy and degree of the correction effect are improved, the feedback adjustment coefficient T can also be calculated by combining with the calculation of the correction lens degree, the calculation of the correction effect of the correction lens is also improved, and the correction effect of the JD is also can be improved by calculating the correction effect of the correction lens degree 5326, and the correction effect of the JD is also can be improved by one time after the calculation of the correction effect is improved, and the correction effect of the JD is calculated by calculating the correction effect of the correction coefficient is further, and the correction effect of the JD is better.
Referring to fig. 1 to 4, the calculation formula of the refractive error basic correction unit is as follows:
;
Wherein:
JD is the corrective lens power;
QD is sphere power, QD reflects the extent of near-sightedness;
SD is cylinder power, SD reflects the degree of astigmatism;
a is the astigmatism axis;
z is the refractive index of the cornea;
B1 is a first radius of curvature of the cornea, B2 is a second radius of curvature of the cornea, and B1 and B2 reflect two principal radii of curvature of the anterior surface of the cornea;
m is the distance between the target object and the eyes of the patient, and m reflects the distance between the detection target and the eyes of the patient;
The sphere power QD measures the power of myopia and hyperopia, and the specific measurement procedure is as follows:
The patient sits in front of the optometry instrument, the chin is placed on the bracket, the forehead is clung to the instrument, the eyes aim at the vision hole of the optometry instrument, the optometry instrument emits light during detection, the light is focused on the retina by utilizing the combination of the lens and the reflector, the refraction state of the eyes is measured, and the sphere power QD is obtained;
The cylinder power SD measures the power of astigmatism, and the specific measurement procedure is as follows:
In the measuring process, the optometry instrument simulates light rays in different directions and angles to enter eyes, observes focusing conditions of the light rays on retina, analyzes focusing positions and shapes of the light rays, and detects cylinder power SD and astigmatism axis position A;
The specific measuring process of the distance m of the target object is as follows:
In the optometry process of the optometry instrument, an optometrist sets an object with a known distance as an observation target, and uses a laser range finder to measure the distance between the observation target and eyes of a patient;
the specific measurement process of the first curvature radius B1 of the cornea and the second curvature radius B2 of the cornea is as follows:
the corneal topography instrument utilizes a laser projection technology to project light onto the cornea surface, observes the reflection condition of the light on the cornea surface, analyzes the position and the shape of the reflected light, draws the topography of the cornea surface, and detects the first curvature radius B1 of the cornea and the second curvature radius B2 of the cornea.
In this embodiment, first, "in this algorithm unit"The calculation section calculates the contribution of the sphere power QD and the cylinder power SD in a specific direction by correcting the cylinder power SD by cos2 (a) because astigmatism has directivity in the specific astigmatism axis a, and the calculation result of this section is used to calculate a part of the total refractive error, together with the cornea refractive index Z, the cornea first curvature radius B1 and the cornea second curvature radius B2 factors, to determine the final correction lens power JD;
“ the calculation part calculates the refractive degree of the light passing through the cornea and influences the imaging position by considering the influence of the cornea refractive index Z, the cornea first curvature radius B1, the cornea second curvature radius B2 and the target object distance m on the refractive error, and the calculation result of the calculation part is used for adjusting the refractive error caused by the cornea refractive index and the curvature so as to ensure that the light can be correctly focused on the retina;
Wherein, inIn the calculation section, 2 is used as a denominator for halving the contribution of the cylinder power SD in a particular direction, since the effect of astigmatism is bi-directional, and only one direction is considered here, inIn the calculation section, as part of the subtraction operation, in particular for subtracting from 1 the change in refractive error caused by other factors, inIn the calculation part, 4 is taken as a denominator, multiplied by m, and used for adjusting the change of refractive error caused by the curvature of cornea and refractive index, so as to ensure the accuracy of calculation;
The refractive power of the eyes of the patient to light is directly reflected by the spherical lens degree QD, the cylindrical lens degree SD and the astigmatism axis A of the cylindrical lens degree SD, the refractive power is the basis for correcting ametropia, the refractive effect of the cornea on the light is further considered by the cornea refractive index Z, the cornea first curvature radius B1 and the cornea second curvature radius B2, the shape and the degree of the correcting lens can be accurately determined, the introduction of the target object distance m is facilitated, the correcting degree can be adjusted according to different viewing distances, and the actual requirements of the patient are met;
In the algorithm unit, as eye parameters of each person are unique, the refractive error base correction unit can customize a correction scheme for a patient according to individual differences of the parameters, the personalized correction not only improves the correction effect, but also reduces uncomfortable feeling and errors in the correction process, and the correction lens degree JD calculated according to the refractive error base correction unit is beneficial to the patient to obtain a clearer and more comfortable visual effect, so that the visual experience of the patient is improved, and positive influence is generated on daily life and work of the patient, thereby improving the overall life quality.
Referring to fig. 1 to 4, the calculation formula for evaluating the eye movement capturing accuracy unit is as follows:
;
;
Wherein:
y is an eye movement capturing precision evaluation value;
f is the instrument resolution, F reflects the resolution of the eye tracking device;
W is eye movement catching error;
X0 is the set track X axis, Y0 is the set track Y axis, (X0,Y0) reflects one of the set points of the eye movement tracking track;
Xi is the ith eye movement track X axis, Yi is the ith eye movement track Y axis, (Xi,Yi) reflects the patient eye movement fixed point corresponding to the (X0,Y0) track fixed point in the set eye movement track;
s is eye movement capturing time
In the present embodiment, first of allThe calculation section calculates a ratio of the eye movement capturing error W to the instrument resolution F for evaluating the magnitude of the capturing error with respect to the resolution, the ratio being used to calculate a part of the eye movement capturing accuracy evaluation value Y reflecting the influence of the capturing error on the accuracy,The calculation section calculates the product of the eye movement capturing time S and the calculated correction lens power JD for evaluating the influence of the capturing time on the accuracy, and this product of the calculation section is used for adjusting the eye movement capturing accuracy evaluation value Y, and it reflects that the longer the capturing time is, the larger the error is introduced, thereby decreasing the accuracy;
Wherein, inIn the calculation part, 10 is taken as a denominator, and the eye movement capturing time S is divided and then squared, so that the influence degree of the capturing time on the eye movement capturing precision evaluation value Y is adjusted, and the accuracy of the evaluation result is ensured;
Upon detection of eye movement, the system will set an eye movement trajectory, and the doctor will direct the patient to perform the eye movement, specifically "look right, look down..+ -.)", where (X0,Y0) is a reference point of one of the eye movement trajectories, and (Xi,Yi) is a patient eye movement point corresponding to (X0,Y0) generated by the patient executing the eye movement instruction, combined withA calculation part for calculating the difference between the set track fixed point and the patient eye movement fixed point to obtain an eye movement capturing error W;
The algorithm unit can monitor the accuracy of the capturing process in real time by calculating the eye movement capturing accuracy evaluation value Y, and once the capturing accuracy is found to be reduced, the system can immediately adjust to ensure the accuracy and the effectiveness of the subsequent correction process, and according to the eye movement capturing accuracy evaluation value Y, the system can automatically adjust the parameters of the eye movement tracking system, so that the capturing efficiency is improved, errors and discomfort caused by inaccurate capturing are reduced, and the application of the eye movement capturing accuracy unit is evaluated, so that the system can capture the changes more accurately, and a more accurate correction scheme is provided for a patient.
Referring to fig. 1 to 4, the calculation formula of the refractive error positive feedback adjustment and correction unit is as follows:
;
Wherein:
T is a feedback adjustment coefficient;
Yprev is the last eye movement capturing accuracy evaluation value;
JDprev is the last corrective lens power;
Based on the feedback adjustment coefficient T, the adjustment calculation formula of the correction lens power JD is as follows:
JDnew=JD+T;
JDnew is the updated corrective lens power.
In the present embodiment, the algorithm unit firstThe calculation part calculates the relative variation between the last eye movement capturing precision evaluation value Yprev and the current eye movement capturing precision evaluation value Y and is used for evaluating the precision variation, and the relative variation is used for calculating a feedback adjustment coefficient T and reflecting the influence of the precision variation on the correction lens degree JD adjustment;
The 'JD+T' calculating part calculates the sum of the current calculated correcting lens degree JD and a feedback adjustment coefficient T, and is used for obtaining updated correcting lens degree JDnew which is currently combined with eye movement and needs correction, and the calculation result is used for updating the correcting lens degree JD, so that the system can continuously optimize the correcting degree according to the accuracy change of eye movement behavior capture;
The algorithm unit is used for calculating the feedback adjustment coefficient T, so that the system can automatically adjust the current updated correction lens degree JDnew according to the change of the eye movement behavior capturing precision Y, and the dynamic adjustment mechanism enables the correction degree to be always kept in an optimal state, thereby improving the accuracy and the effectiveness of the correction effect, and the dynamic adjustment of the correction degree is beneficial to reducing errors and discomfort caused by inaccurate correction, thereby improving the satisfaction degree of a patient and reducing the potential risk caused by incorrect correction;
The application of the refractive error positive feedback adjustment and correction unit enables the system to adapt to eye parameters and eye movement behavior changes of different patients, and the adaptability and the flexibility not only improve the performance of the system;
In summary, in a specific implementation process, the refractive error positive feedback adjustment correction unit calculates the feedback adjustment coefficient T, so as to update the corrected lens power JD output by the refractive error basic correction unit, that is, the updated corrected lens power JDnew, and the updated corrected lens power JDnew is the current correction power that needs to be corrected and combined with the eye movement behavior, so that the updated corrected lens power JDnew is used as the new correction power when the next review is performed, and the last corrected lens power JDprev is replaced in the refractive error positive feedback adjustment correction unit, so that the system continuously optimizes the calculation of the correction power of the refractive error according to the change of the accuracy captured by the eye movement behavior, thereby improving the correction effect.
In a second embodiment, referring to fig. 1 to 4, the updated correction lens power JDnew is directly input to the estimated eye movement capturing accuracy unit and replaced with JD in the next ophthalmic vision test, specifically as follows:
;
and JDprev=JDnew in the next refractive error positive feedback adjustment correction unit.
In this embodiment, by means of the feedback mechanism of the refractive error positive feedback adjustment correction unit to the refractive error basic correction unit, the system dynamically adjusts the correction degree of the refractive error according to the accuracy and precision of the eye movement capturing, and the dynamic adjustment process can gradually optimize the calculation of the correction lens degree JD so as to better conform to the actual situation of the patient, so that the updated correction lens degree JDnew is used as the correction degree which needs to be corrected and combined with the eye movement, and the accuracy is obviously improved;
The feedback adjustment coefficient T in the refractive error positive feedback adjustment correction unit not only influences the calculation of correction degrees, but also indirectly improves the accuracy of eye movement behavior capture, and the eye movement capture accuracy unit and the parameters in the refractive error positive feedback adjustment correction unit are continuously iterated and optimally evaluated, so that the eye movement capture system is more sensitive and accurate, and finer eye movement behaviors are captured, and the improvement of the accuracy has important significance for diagnosis and treatment of ophthalmic diseases;
The refractive error positive feedback adjustment correction unit and the updated correction lens degree JDnew are applied to an ophthalmic examination flow, so that the operation steps can be simplified, the examination efficiency can be improved, the refractive error degree and the eye movement behavior information of a patient can be further obtained more rapidly, and therefore more accurate diagnosis and treatment decisions can be made;
The application of the positive refractive error feedback adjustment and correction unit to the feedback mechanism of the positive refractive error basic correction unit and the updated correction lens power JDnew not only promotes the innovation and development of the ophthalmic examination technology, but also provides a new thought and method for the treatment of ophthalmic diseases. Through continuous research and practice, the relation between the ametropia and the eye movement behavior is further explored, and a more accurate and effective means is provided for the treatment of the ophthalmic diseases;
in summary, the feedback mechanism of the refractive error positive feedback adjustment correction unit to the refractive error basic correction unit and the application of the updated correction lens power JDnew have many beneficial effects in the ophthalmic examination and data collection analysis system, and these effects not only improve the accuracy of correction power and the accuracy of eye movement capturing, but also optimize the ophthalmic examination flow, promote the development of ophthalmic technology and improve the satisfaction of patients.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.