What happens if the interpupillary distance is inaccurate

Of course, it can bring a great degree of problems, dizziness and eye fatigue.

is the most common. But whether it will cause strabismus or not is not sure, it depends on the individual and the actual situation.

Computerized refractors, which have been calibrated and qualified, have reliable data references, and are already very low and very accurate in their interpupillary distance.

Two or three measurements of the instrument can definitely ensure accuracy, I really don't know why so many stores are reluctant to invest a few hundred dollars more to buy a table of IPDs?

The reason for this is that some of them are not paying attention to it, dealing with it perfunctorily, and some are too conceited (my observation is that the more senior people are, the more humble and prudent they are, which always reminds people of Zhuangzi's cooking).

There are also some optometrists.

The interpupillary distance of the left and right eyes has never been measured separately.

In addition, the technical gap in the processing part or the handling of foolery are also the main causes of errors.

If the interpupillary distance measurement of the eye is not accurate, it will lead to the inconsistency between the optical center of the lens and the visual axis of the patient's eye, which will lead to the prismatic effect of the glasses when the patient wears glasses, which can easily lead to the patient's visual fatigue, eye swelling, headache, dizziness, and even nausea, vomiting, blurred vision and other symptoms, which can also lead to an increase in the patient's myopia, and the measurement of the interpupillary distance is inaccurate, and in the long run, it may also cause astigmatism in the eye.

Therefore, the distance between the optical centers of the lenses should be consistent with the interpupillary distance of the person when dispensing glasses, so that the patient can wear glasses more comfortably and achieve the ideal correction effect.

You should usually pay attention to rest and reduce close-up operations.

One of the biggest reasons for the wrong interpupillary distance of glasses is actually the mismatch between the lenses and frames. In other words, if the optical center of a pair of glasses is inconsistent with the pupil, it will cause the patient to feel obvious discomfort when wearing glasses, and sometimes dizziness, dizziness and other phenomena. Therefore, in the process of optometry, since the visual axis of the eye cannot be correctly detected from the appearance, the distance between the pupils of the patient's two eyes is generally measured as the optical center standard for determining the glasses.

If the interpupillary distance measurement is not accurate, the glasses will produce a prismatic effect, causing the patient's eye muscles and vision to be prone to fatigue, which will affect the effect of vision correction, and sometimes lead to further vision loss and increase the myopia of the eye. At the same time, the measurement of interpupillary distance is inaccurate, and in the long run, it may also cause some unnecessary astigmatism in the eyes, which will affect the effect of eye vision recovery.

There is also the wrong interpupillary distance, which will cause eye fatigue, so it can aggravate myopia; If you look at things through the edge of the optical center of the lens at the same time, you will have a prism effect, which means that the refraction of light when it enters the eye changes, which may cause problems such as strabismus of the eye.

To sum up, when we wear glasses, the interpupillary distance of the glasses must be the same as the interpupillary distance of our eyes, so as not to bring harm to our eyes.

Measurement of distance with interpupillary distance:

1. The examiner and the patient are seated facing each other at a distance of 40cm, so that the sight of the two people is kept at the same height.

2. The examiner holds the interpupillary ruler or ruler with the thumb and index finger of the right hand, and the rest of the fingers are leaning on the patient's cheek, and then places the interpupillary ruler at the lowest point of the nose bridge and slightly inclines along the angle of the nose bridge.

3. The examiner closes the right eye, so that the patient's right eye fixes on the examiner's left eye, and the examiner aligns the "zero position" of the pupil ruler with the patient's right eye when the left eye fixes on the patient's right eye.

4. The examiner opens the right eye and closes the left eye, so that the patient's left eye fixes the examiner's right eye, and the examiner accurately reads the value of the interpupillary distance ruler in the center of the pupil of the patient's left eye when the right eye fixes on the patient's left eye.

5. The examiner repeats step 3 to confirm whether the "zero position" of the interpupillary distance ruler is aligned with the center of the pupil of the patient's right eye. If it is accurate, the value read in step 4 is the interpupillary distance of the patient.

It can be measured with a pupillary distance meter or by hand by an optometrist (three times, taking the relative average).

Through the center measuring instrument, measure the dots, and then use a ruler to measure the distance between the two dots. The most convenient way is to go to an optical store and ask the clerk to test it for you.

First of all, you must have an accurate optometry sheet, which includes: the myopia and farsightedness of the left and right eyes of the glasses; and interpupillary distance between the eyes; If you have astigmatism, you also need to provide the astigmatism degree and the axis position of astigmatism, and glasses cannot be worn without interpupillary distance. If you have a need for glasses, it is recommended to go to Aier Eye Hospital, for more details, please click here [**Make an appointment with an ophthalmologist].

Interpupillary distance refers to the distance between the center of the pupils of a person's eyes. Just as people can be tall or short, people's IPD varies greatly, some people have an IPD of less than 50 mm, some people have more than 70 mm, and most people have a pupil distance of about 60 mm. For people who wear glasses, accurate measurement of interpupillary distance is extremely important for fitting a qualified pair of glasses, if the interpupillary distance is not accurate, then the prescribed glasses are not suitable for wearing.

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The interpupillary distance error of online shopping myopia glasses is large, and long-term wearing will increase the degree.

After testing, the prescription of the 4 pairs of glasses was consistent with the prescription provided by the reporter. However, the interpupillary distance of 4 pairs of glasses has deviated, and the largest difference reached the 24th of January, the relevant person in charge of the optometry center of Beijing Tongren Hospital said that the incorrect interpupillary distance is manifested as the displacement or deformation of the object through the lens vision, and there is an uncomfortable feeling after wearing. What you see is not the clearest.

The higher the power, the greater the distortion, which can also cause vertigo.

In addition, the test showed that all 4 pairs of glasses were ordinary spherical lenses. "To put it simply, ordinary spherical surfaces are prone to wear and tear, have a short lifespan, and wear them for a long time will affect your vision. The optometrist said.

The relevant person in charge of the Tongren Optometry Center said that aspherical lenses are more comfortable and the mirror surface is thinner. Ordinary spherical lenses, if the prescription is high, the lens will be very thick, and it will be uncomfortable to wear.

Before explaining the importance of interpupillary distance in detail, we must first understand three concepts: "interpupillary distance", "geometric center distance", and "optical center distance", which are actually not the same, "interpupillary distance" is the distance between the two eyes of a person, "geometric center distance" refers to the distance between the geometric center points of the two lens circles on the left and right sides of the spectacle frame, and "optical center distance" refers to the distance between the optical center points of the lens after the glasses are fitted. In a nutshell:

"Interpupillary distance" is for "people"; Geometric Center Distance is for Frames; "Optical center distance" refers to "glasses with good lenses". Qualified glasses are the "optical center distance" of glasses with good lenses, which should be aimed at the "interpupillary distance" of the person, so that both eyes can see through the optical center of the lens, which is the most comfortable. If the amount of interpupillary distance is inaccurate, or the optical center distance of the lens is not accurate, it will produce a "prism" effect, which will cause the image to displace, causing many symptoms

In mild cases, double vision, dizziness, dispersion, and inability to see for a long time occur, or squint is induced, causing the eye position to shift.

Basically, optical stores will not measure the pupil height of BAI customers who make ordinary lenses, and the more formal way is to make the pupil height on the center of the lens. It's already relatively close to the pupil. And when I look at things, my eyes are biased up and down, left and right, so the pupil height is accurate.

It is also impossible for the wearer to see through the center of the lens in a fixed posture and angle completely, and the pupil height is of little significance.

Generally speaking, ordinary glasses as long as the center of the pupil is on the horizontal line of the two temples, unconventional glasses, such as the frame of the temples on the top of the frame, let the pupils in the lens vertical binox point 1,2mm above the place, glasses design and processors will consider this problem, so according to the above principles to wear it, but some too poor field store weights are done in the middle. Some will also do it on the lower side.

Basically, optical stores do not measure the pupil height of customers who make ordinary lenses. The more formal approach is to make the pupil height above the center of the lens. It's already relatively close to the pupil.

And when you look at things, your eyes are tilted up and down, left and right. So Hitomi was accurate. It is also impossible for the wearer to see through the center of the lens in a fixed posture and angle.

Hitomi height doesn't mean much.

The normal practice of our store is to do pupil height measurement for minors. And instruct him not to wear glasses too low or too high.

Due to the accurate measurement of minors in the process of development, the prismatic effect of lenses on the eyes can be minimized, and the impact of lens use on eye development can be reduced.

Generally speaking, ordinary glasses only need the center of the pupil to be on the horizontal line of the two temples. Unconventional glasses, such as shelves with temples on top of the frame. Allow the pupil to be 1.2 mm above the vertical binox of the lens.

Eyewear designers and fabricators consider this question. So you can wear it according to the above principles. However, some of the wild shops that are too poor are probably made in the middle.

Some will also do it on the lower side.

Lanzhou Qilihe Bohua glasses.

Each pair of glasses is strictly subject to measuring pupil height. Everyone's eyes are in a different position. Especially for functional lenses, the pupil height must be measured to ensure customer comfort.

Your strictness is responsible for customers!

Leading glasses remind you:

Under normal circumstances, ordinary glasses do not point to pupil height, they are all done according to the routine, if the data is not too outrageous, basically has no effect.

However, if you wear functional glasses, you must have your pupils, otherwise it will affect the clarity of your vision.

Conventional ones can be unpredictable, and special cases can be measured, such as progressive films, non-spheres, etc.

Ordinary single-vision lenses are generally not measured, basically the center point of the pupil can correspond to the center point of the lens, and the pupil height is measured by users of progressive multifocal lenses.

Measuring pupil height is generally required with a near-gradient film, and a single light will not be measured, only if the pupil height is not low, there is no problem.

In order to align the optical center distance of the lens with the interpupillary distance of both eyes, it is comfortable for the wearer to wear. According to the national standard for assembling glasses, it is still acceptable to transfer the center within a certain range.

If the optical center distance of the lens is the interpupillary distance.

If it does not match, the scene seen through the lens will be distorted, distorted, and blurred, which is called a prism.

effect, which is very harmful to the eyes. Similarly, if the interpupillary distance of the mirror is not suitable, it will cause dizziness and nausea, and of course, the inappropriate frame will also directly affect the position of the lens, which will also cause visual fatigue.

Damage to the eyes.

Due to the deviation between the interpupillary distance of the large-frame glasses lens and the interpupillary distance of the human eye, people with small interpupillary distance wearing such glasses will create a deviation in the focus between the pupil and the center of the lens, resulting in blurred vision, visual fatigue, and easy to cause myopia.