What is pd on glasses prescription?

Eyeglass prescriptions can be very difficult for the layperson to decipher.
In fact, they are filled with many different numbers, letters and abbreviations whose meaning may be unknown to us.
In particular, it is important to know what the letters PD mean on your prescription for glasses.

What does PD mean on an eyeglass prescription?

Your optician will need to take a number of measurements to provide you with the most suitable prescription glasses.
This personal information allows the pair to be accurately fitted and the vision to be precisely corrected.
One of the most important pieces of information your optician will need is your pupillary distance, known as PD on your prescription.
This measurement is simply the distance between the centres of the two pupils.
It allows the right positioning of the corrective lenses in the glasses for optimal vision.
During the fitting process, the optician must ensure that the lenses are precisely aligned with the pupils.
In fact, it is crucial that the centre of the lens matches the centre of the pupil.
Pupillary distance is measured in millimetres using a special device, but can also be measured using an adapted ruler.
The average adult pupillary distance is 63 millimetres, with a slight difference between women (62 mm) and men (64 mm).
In children, the average pupillary distance is 56 mm.
It should be noted that there are two types of pupillary distance measurement: binocular and monocular.
The former measures the distance between the two pupil centres, while the latter measures the distance from the centre of one pupil to the bridge of the nose.

What are the key prescription abbreviations?

An eyeglass prescription details all the precise data that the optician needs to design perfectly fitting glasses.
The measurements for each eye are given using the letters OD (oculus dexter) for the right eye and OS (oculus sinister) for the left eye.
This is important since the two eyes do not generally have the same parameters and correction requirements.
One of the basic parameters is SPH, which stands for sphere, and is used to determine the power of the lens needed to correct vision.
This value, measured in dioptres, is preceded by a + or a -, depending on whether you are long-sighted or short-sighted.
The degree of astigmatism is indicated by the abbreviation CYL for cylinder, which measures the curve of the cornea.
Together with PD, this data forms part of the essential information the optician needs to provide you with the best possible spectacles.

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