What is the pupillary distance?

Pupillary distance is the distance between the centers of the eye pupils. This value is usually given in millimeters because it is an accurate measurement system that is useful for very small measurements. Pupillary distance becomes particularly relevant to glasses when used to ensure that the glasses are properly mounted on the wearer's face. Sometimes it is written directly on regulations and in other cases it can be omitted for reasons that will be explained soon. There are usually two measurements, one, while the patient focuses on the targets of medium to long range and the other, while the patient looks at the target close up. Pupillary distance will be given in two values, one for distance vision and the other to read vision. This is done for bifocals or for recipes for reading glasses.

It is also possible to measure the pupillary distance at home using the ruler. It is usually useful to let a friend or partner make a real measurement even if people can look in a mirror and use a ruler appropriatelyexactly. Pupillary distance can vary very much from man to person and it is wise to perform at least two measurements to confirm that the measurement is really correct, rather than if it is probably on the first attempt.

Some optometrists leave the pupillary distance measurement outside the recipes if they are not specifically asked to add them. This may be the result of oblivion, but it is more often done to encourage patients to order glasses through an optometrist. Sale of lenses and frames can be an important part of the company and ask patients to order in the patient's office, to monitor with assembly to confirm that the glasses are useful, and remind patients when it is time to get another eye test.

patients may ask that the pupil distance measurement is recorded so that they can perform the prescription elsewhere. Sometimes it is written as the only number and sometimes written as two. WhoThere are two numbers like 33/27, reflecting the measurement from the center of each pupil to the bridge of the nose. Some people are surprised to find that asymmetry is not as unusual in terms of pupillary distance.

Incorrect size glasses will not feel comfortable to wear and can cause vision problems. At least the patient may find that the vision is not correctly repaired and patients may also develop headaches and eye stress as their eyes have problems with focusing through lenses. It is therefore important to ensure that the pupil distance is considered to be considered when assembling the glasses.