Forget about the optometrist, You can get your accurate PD within 10 seconds here If you're wearing glasses perhaps you've heard about the PD, but do you know what is PD? will you wonder what role does PD play in a pair of glasses and even how to measure PD, Let's learn about it today.
First, you need to know each set of prescription lenses has an "optical centre" that is determined by the Pupillary Distance (PD). PD is the distance between the centre of one pupil to the centre of the other and is used to determine where you look from the lens of the glasses. So PD should be as accurate as possible, having a correct PD makes sure your eyes match up with the optical centre of your lenses. Otherwise, you will feel unwell after wearing the glasses, and the vision of the eyes will be affected.
If this number was not provided on your prescription by your eye care professional, don't worry! you can easily measure it yourself.
Below are the steps to measure your own PD. step 1. Position yourself approximately 8 inches (20 cm) away from a mirror or yourself arm’s length from your friend.
step 2. Close your left eye and align the ruler’s zero to the centre of your right pupil.
step 3. Try not to move your head or the ruler.Close your right eye and note the reading directly over your left pupil. That will be your PD.
step 4. You also need to measure the distance from two pupils to the centre of nose respectively to make sure that if you have two PDs (OD & OS).
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TIPS Most men have a PD between 60 - 65 mm. Most women have a PD between 58 - 63 mm. Most children have a PD between 50 - 55 mm. Take a few measurements for consistency For bifocal and progressive lenses, two PD values (OD & OS) are needed