What are the symptoms of incorrect pupil distance of glasses?

Myopia can be said to be a cross-era disease. Why do we say that? Mainly because many years ago, myopia was particularly rare. After all, people at that time did not have so many electronic products and did not know how to protect their eyes. But now, on the contrary, myopia has become an eye disease that everyone must suffer from. If you want to correct myopia, then wearing glasses is the easiest way. So, what are the manifestations of incorrect pupil distance of glasses?

The pupil distance refers to the distance between the centers of the two pupils when the visual axis is facing straight ahead and parallel. A pair of glasses consists of two optical lenses. The distance between the optical centers of the two lenses should be consistent with the human pupil distance so that the human eye will feel comfortable. When there is a large deviation, it will cause obvious discomfort. The vertical difference in the optical centers of the glasses is manifested as one high and one low optical center of the two lenses, while the horizontal difference is manifested as the asymmetry of the optical centers of the two lenses, one inside and one outside. The astigmatism axis error is manifested as the axis of the lens not matching the visual axis of the human eye, resulting in double images. In particular, vertical difference has a greater impact on vision. Therefore, a pair of glasses must meet all the technical indicators specified in the three national eyewear standards to be considered qualified.

When fitting glasses, the most important step is to have an eye test, and in the process of eye test, measuring the pupil distance is the most critical step. However, many people have reported that every time they get a pair of glasses, they feel uncomfortable to wear and their vision is not very clear. A big reason for this is related to the accurate value of the pupil distance, that is, it is caused by the incorrect pupil distance of the glasses. So what are the reasons that affect the incorrect pupil distance of glasses, and what are the dangers of incorrect pupil distance of glasses? Today, the editor will take you to learn about it.

The biggest reason for incorrect pupil distance of glasses is actually the incoordination of specifications of lenses and frames. That is to say, for a normal pair of glasses, if the optical center of the lens is not consistent with the visual axis, the patient will feel obvious discomfort when wearing the glasses, and sometimes experience dizziness, blurred vision and other phenomena. Therefore, during eye examination, since the visual axis of the eye cannot be accurately detected from the appearance, the distance between the patient's pupils is generally measured as the standard for determining the optical center of the glasses to accurately measure the pupil distance.

The harm of incorrect pupil distance of glasses. If the pupil distance is not measured accurately, the glasses will produce a prism effect, causing fatigue of the patient's eye muscles and vision, which will affect the effect of vision correction, and sometimes lead to further deterioration of vision and increase the degree of myopia. At the same time, inaccurate pupil distance measurement may cause some unnecessary astigmatism in the eyes in the long run, affecting the effect of vision recovery.

Although the pupil distance of the glasses is incorrect, the biggest reason is the inconsistency between the specifications of the lenses and frames. However, during eye examination, incorrect eye examination or inaccurate measurement of pupil distance may also cause the pupil distance of the glasses to be incorrect. Therefore, when getting your eyes tested and glasses fitted, it is best to go to some more formal eyewear stores, which can not only accurately measure your pupil distance, but also allow you to further understand other eye problems.