First of all, of course, the most conspicuous thing is the vision of the left and right eyes. These numbers tell you the vision of the farthest line you can see when you stand in front of the eye chart. For example, "R 1.0" means that the right eye vision is 1.0, and "L 0.8" means that the left eye vision is 0.8. Generally speaking, normal vision should be above 1.0. If your vision value is low, you may need to pay attention to whether there are vision problems, such as myopia, hyperopia or astigmatism.
Besides the basic visual values, there are other combinations of numbers and letters on the bar. Among them, "SPH" represents the degree of spherical lens, that is, the degree of myopia or hyperopia. If there is a negative sign after "SPH", it means that you are nearsighted. The greater the value, the deeper the degree; If it's a plus sign, it means you have farsightedness. And "CYL" represents the degree of cylindrical lens, which is the degree of astigmatism. If this number is high, it may indicate that your eyes have astigmatism problems.
In addition, "AX" represents the axial direction of astigmatism. This number can help doctors understand the type and degree of your astigmatism, so as to correct it better. There are other combinations of letters and numbers. For example, "PD" stands for pupil distance, which is the distance between the pupils of two eyes. This data is very important for glasses, because if the pupil distance is not accurate, it will not only lead to blurred vision, but also cause eye discomfort.
In addition to these basic combinations of numbers and letters, there may be some other test results on the bar. For example, the degree of correction and corrected vision, these data can help doctors understand your vision health and guide you to take appropriate corrective measures. In addition, there are sometimes some data about corneal curvature and intraocular pressure on the test paper. These data are equally important. They can reflect the physiological structure and health of your eyes.
Speaking of which, I have to mention the picture that gives me a headache. I really didn't know how to look at it at first, but after the doctor's explanation, I understood that the chart is actually a very useful tool. There is usually a curve on the picture showing your field of vision. The abscissa is the test distance, and the ordinate is the visual value. By observing the trend of this curve, the doctor can judge the change of your vision. If the curve shows a downward trend, it may indicate that you have myopia problems; If the curve shows an upward trend, it may indicate that you have farsightedness. This picture can help doctors understand your vision and changes more intuitively.
In a word, although there are many numbers and letters on the printed paper strip of the vision test, it is dazzling, but as long as we study and study a little, we can understand the significance and importance of these data. If you are in doubt or do not know the data on the test paper, it is recommended to consult a doctor or optometrist in time. At the same time, we should also pay attention to maintaining correct eye posture and healthy living habits to protect eye health.