What if the pd measurement is wrong

Read on to see how easy it is to measure your PD right at home! This measurement is used to determine where you look through the lens of your glasses.

A single PD is one number that represents the measurement of the center of one pupil to the center of the other in millimeters. The average adult PD range is between mm. The average child PD range is between mm.

The wrong PD can induce eye strain, fatigue, headaches and blurry vision. If you have a high prescription and the wrong PD these symptoms are often much worse. Starting with the right eye, line up the zero end of the ruler at your pupil; measure the distance from your right to your left pupil.

The millimeter number that lines up with your left pupil is the measurement you want. That number is your PD. Jot it down. Wrong PD means you might as well be wearing the wrong prescription! Grab your old glasses and a non-permanent marker pen. Get your partner to mark a small dot where your pupil is behind the lens.

Measure the distance between the dots for your total PD. Some offices will put the PD measured by some of the instrumentation during your exam on the prescription and others will have the optician take that measurement for you.

The doctor during your exam does not take your PD at anytime during your exam, as that is left to the optician who is going to make your eyewear. Why does the optician not give me my pupillary distance? Your ophthalmic practitioner or optometrist is not required by law to include details of the horizontal distance between your pupils the inter-pupillary distance in your prescription. Two low numbers e. Two high numbers e. The average PD measurements for women is 62mm and for men 64mm.

Between 58 and 68 is quite normal though. A pd difference of 1mm is not going to cause trouble, in real terms 1mm is a variance of. It requires eye doctors — ophthalmologists and optometrists — to give patients a copy of their prescription — whether they ask for it or not. It's the law. Here are questions and answers to help you comply with the Eyeglass Rule. Even a 2mm difference in pupillary distance can cause a pair of eyeglasses to feel off because your pupils tend to converge or diverge to the center of the lens.

Moreover, pupillary distance is more crucial the higher the power of your prescription. The wrong PD can induce eye strain, fatigue, headaches and blurry vision.

If you have a high prescription and the wrong PD these symptoms are often much worse. Sometimes it is a vague sense that something is wrong with their glasses.