Ways To Measure Your PD When Buying Specs Over The Internet
Appraising your pupillary distance:
This measurement is the distance between the centre of your pupils that is measured in millimetres.
Opticians do not tend to give out this measurement as it encourages patients to buy their spectacles from them whereas you can buy cheap spectacles online or designer glasses at a fraction of the price online. It is usually written as one measurement such as 60 (60mm) but can also be shown as R 29 L 31. When penned in this way it is the individual space from your right and left pupils to the midline of your nose.
When Varifocals, High Prescriptions or Prisms are ordered the measurement is commonly split individually. On the whole, if you have a single vision prescription, it will be written down as one value.
If you do not know this measurement and don’t want to measure it yourself then most online opticians will make your PD the national average (63) for men and (60) for women.
You could ask a friend or family member to calculate your pupillary distance for you:
This is the easiest method for measuring you PD. With your friend sitting opposite you at the same height ask them to place a ruler across your forehead just above your eyes with the millimetre side facing upwards.
Next ask your friend to close their right eye and you then look directly into their left eye. Ask your mate to slide the ruler to bring about the zero value is in the center of your right pupil and to hold the ruler very secure across your forehead. Then ask your friend to close their left eye and for you to look directly into their right eye.
Your acquaintance will then read off the measurement to the centre of your left pupil. And that is it! It really is that easy! Please see the diagram below to help you further.
Use your current spectacles to measure your PD with the aid of an assistant:
Put your glasses on so that they are comfortable and steady. Call For your mate to stand opposite you and verify on your lenses the position of your pupils with a non lasting marker.
There should be two lines visible in your line of sight, whilst you are viewing through your eyeglasses. Simply, remove your specs and measure the distance between the two markings. And that is it! If the ruler shows 6 cm then your pupillary distance will be termed as 60. If the measurement is 6.3cm then your PD will be 63.
If you have a varifocal measurement, then just measure across from your right eye to the centre of your nose and then again from the centre of your nose to your left eye and record the individual readings for both your left and right eyes. When buying non-prescription designer sunglasses this measurement is not applicable.
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