Abstract: the purpose of measuring the pupil distance is to make the optical center distance of the lens consistent with the pupil distance of both eyes, so that the wearer can wear comfortably, otherwise there will be prism reaction, and the wearer will have symptoms such as visual fatigue, dizziness and nausea., How to measure the pupil distance accurately? Senior optometrist of Jinggong glasses reminds you: we all know that pupil distance is the distance of pupil. In the process of eye matching, optometry is the most important. In the process of optometry, there is the inspection of measuring pupil distance. Pupillary distance includes distal pupillary distance, proximal pupillary distance and common pupillary distance. During the measurement, the three pupil distances are measured according to a certain distance. This parameter needs to be considered when matching glasses. We all know that the optical center should match the pupil distance of the patient. Otherwise, even if the degree is correct, there will be discomfort after wearing glasses and affect the vision. So how to measure the pupil distance accurately? How many people really know? Let’s have a look., For the measurement of distant pupillary distance, the following two methods are usually used when the pupils of both eyes are in normal physiological state., 1. The distance from the center of the pupil of the right eye to the midpoint of the pupil of the left eye., 2. The distance from the outer edge of the pupil of the right eye (temporal side) to the inner edge of the pupil of the left eye (nasal side); Or the distance from the inner edge of the right eye pupil (nasal side) to the outer edge of the left eye pupil (temporal side)., Remote pupillary distance routine measurement steps, 1 The examiner and the patient are facing each other at a distance of 40cm, so that the two people’s sight can be kept at the same height., 2. The examiner holds the pupillary distance ruler or ruler with the thumb and index finger of his right hand, and the other fingers lean against the patient’s cheek, then place the pupillary distance ruler at the lowest point of the bridge of the nose and tilt slightly along the angle of the bridge of the nose., How to measure
pupil distance accurately? Senior optometrist of Jinggong glasses reminds you: we all know that pupil distance is the distance of pupil. In the process of eye matching, optometry is the most important. In the process of optometry, there is the inspection of measuring pupil distance. Pupillary distance includes distal pupillary distance, proximal pupillary distance and common pupillary distance. During the measurement, the three pupil distances are measured according to a certain distance. This parameter needs to be considered when matching glasses. We all know that the optical center should match the pupil distance of the patient. Otherwise, even if the degree is correct, there will be discomfort after wearing glasses and affect the vision. So how to measure the pupil distance accurately? How many people really know? Let’s have a look.
distance measurement
the following two methods are usually used to measure when the pupils of both eyes are in normal physiological state.
1. The distance from the center point of the right eye pupil to the midpoint of the left eye pupil.
2. The distance from the outer edge of the pupil of the right eye (temporal side) to the inner edge of the pupil of the left eye (nasal side); Or the distance from the inner edge of the pupil of the right eye (nasal side) to the outer edge of the pupil of the left eye (temporal side).
remote pupillary distance routine measurement steps
1 The examiner and the patient shall be seated face to face at a distance of 40cm, so as to keep their sight at the same height.
2. The examiner holds the pupillary distance ruler or ruler with the thumb and index finger of his right hand, and the other fingers lean against the patient’s cheek, then place the pupillary distance ruler at the lowest point of the bridge of the nose and tilt slightly along the angle of the bridge of the nose.
3. The examiner closes the right eye and makes the patient’s right eye look at the examiner’s left eye. When the left eye looks at the patient’s right eye, the examiner aligns the “zero position” of the pupil distance ruler with the pupil center of the patient’s right eye.
4. The examiner opens the right eye and closes the left eye, so that the patient’s left eye looks at the examiner’s right eye. When the right eye looks at the patient’s left eye, the examiner accurately reads the value of the pupil distance ruler in the pupil center of the patient’s left eye.
5. The examiner repeats step 3 to confirm whether the “zero position” of the pupillary distance ruler is aligned with the center of the patient’s right eye pupil. If it is correct, the value read in step 4 is the pupil distance of the patient.
near pupillary distance measurement
1 The examiner and the patient shall be seated face to face at a distance of 40cm, so as to keep their sight at the same height.
2. The examiner holds the pupillary distance ruler or ruler with the thumb and index finger of his right hand, and the other fingers lean against the patient’s cheek, then place the pupillary distance ruler at the lowest point of the bridge of the nose and tilt slightly along the angle of the bridge of the nose.
3. The examiner closes the right eye, causes the patient’s two eyes to focus on the left eye, and uses the left eye to focus the “zero position” of the pupil distance ruler on the pupil center of the patient’s right eye.
4. The examiner opens his right eye, still makes the patient continue to look at his left eye, and reads the value on the pupil center of the patient’s left eye with his right eye.
5. Repeat steps (3) to (4) three times, and take the average value as the proximal pupillary distance.
special case pupil distance measurement
1. The sizes of the two pupils are different.
can measure the distance from the inner edge and outer edge of the right pupil to the outer edge and inner edge of the left pupil respectively, and then take the average value of the two readings. That is, PD = (AB + CD) / 2
2. The position of the two pupils is asymmetric
, that is, the pupils of one or two eyes are not in the center of the iris. It is often seen after trauma or senile cataract surgery, and its pupil distance is difficult to measure. Glasses can be used to determine its value.
3. Pupillary distance measurement of strabismus
⑴ the examiner and the patient are facing each other at a distance of 40cm, so as to keep their sight at the same height.
⑵ the examiner holds the pupillary distance ruler or ruler with the thumb and index finger of his right hand, and the other fingers lean against the patient’s cheek, then place the pupillary distance ruler at the lowest point of the bridge of the nose and tilt slightly along the angle of the bridge of the nose.
⑶ the examiner closes his right eye and makes the patient’s right eye look at the examiner’s left eye. The examiner covers the patient’s left eye with his left hand and aligns the “zero position” of the pupil distance ruler with the pupil center of the patient’s right eye.
⑷ the examiner opens the right eye, closes the left eye, makes the patient’s left eye look at the examiner’s right eye, the examiner covers the patient’s right eye with his left hand, and reads the value of the pupil distance ruler in the pupil center of the patient’s left eye, which is the pupil distance of the patient.
monocular pupillary distance measurement when the nasal bridge of
patients deviates significantly from the midline, monocular pupillary distance measurement is required.
⑴ the examiner is separated from the patient40cm from the front to the seat, so that the two people’s sight can be kept at the same height.
⑵ the examiner shall measure from the pupil center of an eye to the midline of the partial bridge of the nose to obtain the monocular pupillary distance.
⑶ accurate monocular pupillary distance measurement requires the use of a pupillary distance meter. The purpose of
and
to measure the pupil distance is to make the optical center distance of the lens consistent with the pupil distance of both eyes, so that the wearer can wear comfortably. Otherwise, prism reaction will occur, and the wearer will have visual fatigue, dizziness, nausea and other symptoms. The details should be determined according to the individual constitution. You can try your glasses to see whether they are clear. If you don’t see the object clearly, you should match the glasses according to the specific situation.