In the previous article, we discussed “Are carbon fiber glasses good?“. In this article, let’s talk about “What happens if PD is wrong on glasses?”.
How to measure PD?
The examiner and the patient are 40cm apart, facing the seat so that both eyes are at the same level. The examiner holds the ruler with the thumb and index finger of the right hand. The ruler is then placed at the lowest point of the bridge of the nose and tilted slightly along the angle of the bridge of the nose. The examiner closes the right eye and has the client focus both eyes on the left eye, using the left eye gaze to align the 'zero' position of the ruler with the pupil center of the patient's right eye. The examiner opens the right eye while the client continues to look at the left eye, using the right eye to read the value in the pupil center of the patient's left eye.(https://www.koalaeye.com/collections/eyeglasses)
Matters Should Be Noted
The eyes of the examiner and the patient should be at the same height at all times. Do not touch the eyelashes of the affected eye. When the ruler is in the 'zero' position, be sure to hold the ruler firmly. Let the affected eye focus in a certain direction. Usually, it should be repeatedly measured 2~3 times, and take its accurate value.
What happens if PD is wrong on glasses?
It occurs blurred vision, and this problem will always be there, no matter how long you wear glasses. You may notice the double vision. In some cases, you may have frequent headaches, nausea, or uncomfortable feeling. On top of that, your eyes will feel tired and you will feel a constant pressure in your eyes. These symptoms may vary depending on how wrong the measurement is. If the optical center of the glasses lens is not consistent with the axis of vision, it will lead to an uncomfortable feeling when wearing glasses, and sometimes dizziness, dizziness, and other phenomena. Wearing the glasses will feel uncomfortable. And long term wearing glasses that have PD errors will be easy to be fatigue, for a long time the degree will grow.
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