Visitor publication

Is computer optometry accurate? Not simply determined by the computer refractometer

Posting time:2022-10-06 02:07:08

Is computer optometry accurate? Not simply determined by the computer refractometer

People often ask whether the computer optometry of the optical shop is accurate? It should be noted that the degree of fitting glasses is not simply determined by a computer refractometer. Computer refraction is a preliminary determination of the refractive state of the patient's eyes. It is a reference for professional refraction. Computer refraction often has errors and cannot be used as a prescription. mirror prescription. The final "degree" of glasses depends on scientific subjective optometry and professional visual function inspection. Here we will discuss what details can help optometrists get more accurate optometry data when using computer optometry! 1. Language guidance aids adjustment and relaxation After adjusting the appropriate height position of the optometrist (including body position, head position, and eye position), and instructing the subject to widen his eyes and look forward, the optometrist should pay attention to language guidance, so that the subject can be inspected. Try to relax as much as possible so that the best data can be detected. 2. More than 5 times of monocular detection, more than 5 times of monocular detection, try to require the spherical lens value to fluctuate within 0.25D for 3 consecutive times. Generally, the adjustment power of adults is weakened. As long as the degree of coordination is good, most tests can meet the requirements for 5~6 times , and most of the young people and the subjects with poor cooperation need to test 8 to 10 times or more to achieve the goal of "the fluctuation range of the spherical mirror value for 3 consecutive times is about 0.25D". 3. Carefully observe the data changes Each measurement, not only by adjusting the handle to ensure that the reflective point in the center of the cornea is the brightest and the smallest and in the center of the measurement ring, and carefully observe the changes of each measurement data, not only the spherical lens data changes to To evaluate the relaxation of adjustment, it is necessary to observe the changes in the power and axial position of each cylinder. 4. "Full display" to print the measurement results The measurement results of the computer refractometer can be printed in a variety of display forms. Some stores may set the "paper saving" mode to reduce the loss of the print head, and each eye only prints It is quite inadvisable to obtain the average of the individual measurements. Do you really want to use a computer refractometer as a "point-and-shoot camera"? All measurements should be printed out in "full display" form for analysis. 5. The reading data of "Gold Rush in the Sand" adopts the measurement result printed out in the form of "full display". Below the previous measurement value of each eye is the average value of all times of measurement, and some have a pure spherical mirror "S.E" value ( The conversion value of contact lens degree has little reference in the optometry process).
①If the measured values ​​of each time are relatively stable (including spherical lens value, cylindrical lens value and axial direction), the average value can be directly used as the starting point for the next subjective optometry; if the optometrist fully understands the Performance parameters, the estimated spherical lens deviation value can be deducted on the basis of this average data to shorten the time-consuming of subjective refraction. ②If the previous measurement values ​​fluctuate greatly, the average value data cannot be used directly. It is necessary to find out more than 3 times of data with similar spherical, cylindrical and axial degrees of all measurement values ​​and take the average value as The starting point data of the next subjective optometry. ③In the computer optometry measurement, it is often encountered that the cylinder axis is constantly changing, and the average value of the cylinder degree and the axis in this case is even more meaningless. After the spherical lens is corrected to about 0.8, the rotation detection of the slit film can be added. In most cases, the corrected vision in all directions does not change significantly. Generally, it is not necessary to add a cylinder, or the JCC cross cylinder is finely calibrated to determine whether it needs to be added. Cylinder. ④If the negative cylinder axis is near the 180 direction and the cylinder degree is low, it is likely to be physiological astigmatism. If there is no change in visual acuity in each meridian direction after the slit film test, and the main complaint is that there is no astigmatism symptoms and the original lens has no astigmatism, it is OK. Cylinders are not considered. On the contrary, if the axis of the negative cylinder is in the vertical direction, it is mostly caused by crystal astigmatism, and the cylinder should be corrected as much as possible, because the astigmatism symptoms such as visual fatigue in this case are more serious, and the low degree of visual fatigue is often more serious. Even cause eye swelling and headache, giving the cylinder can eliminate or relieve symptoms. If it is a positive cylinder, try to give a cylinder as far as the subject can accept it to relieve the symptoms of astigmatism caused by astigmatism. Summary: A pair of glasses is comfortable or uncomfortable to wear, which has a lot to do with the accurate diopter. As spectacle practitioners, we can not only do computer optometry examinations for patients, this is not responsible for patients. As a patient, we must polish our eyes when we wear glasses, and go to a professional optical shop and optometry center to choose a pair of qualified glasses for our children.

Top ranking

Links