![]() ![]() Received: FebruAccepted: AugPublished: September 13, 2018Ĭopyright: © 2018 Wang et al. PLoS ONE 13(9):Įditor: Jinhai Huang, Wenzhou Medical University Eye Hospital, CHINA You can always go to an optician for the measurement, as they will give you the most accurate measurement.Citation: Wang X, Dong J, Tang M, Wang X, Wang H, Zhang S (2018) Effect of pupil dilation on biometric measurements and intraocular lens power calculations in schoolchildren. It is recommended to ask somebody like your family member or friends to check your measurements and make sure they calculate accurately. There are chances of error if your mirror is convex or concave as they might give you a larger ruler image and then the measurement would get incorrect. This reflected image might give you the wrong results, as there are many cases where these types of errors are found. For taking the PD you need to sit in front of a mirror but all you can see in the Mirror is the reflection of the objects that you are using. There are high chances of getting the wrong PD on your own. The first and foremost reason to avoid taking your PD by yourself is that the calculation of PD will not be accurate. Therefore, it will give you the wrong measurement and that might lead to improper fitting of the glasses. Secondly, if you are at your developing age, it is advised not to take the measurement from your previous glasses because your body develops as you grow old. Therefore, it has to be examined by the manufacturer. There are many bends and curves in the glasses that may give you the wrong results. In order to get the measurements from your previous glasses, you need to send the glasses to the manufacturer so that they can give you exact measurements of your previous glasses. However, it is a very complicated procedure. One of which is measuring your old glasses. There are some other ways as well to measure pupillary distance. Measure the distance between these dots on your lens, this is your PD.Mark the point on your other lens similarly.Close your right eye then mark the object at the point it appears on your lens.Focus on an object at a distance of 20feet away while wearing your eyeglasses.The procedure to measure the PD is quite easy with this method. What you need is just an old eyeglass and a marker. This is the simplest method to measure your PD. Repeat the same procedure for the measurement of the other eye.Measure with the ruler to align your eyes while the measurement is going on.Be steady with their hands while measuring the distance or it might lead to error in the measurements.Hold the ruler between the thumb and the index finger to have a firm grip.Sit beside your optician at one arm distance while he/she is measuring your pupillary distance so that it is easy for them to mark the correct measurements.The number you see lining at the mm scale from your right eye is your Pupillary Distance.Look in the mirror then close your left eye and open your right eye.Put the one end of the millimeter scale on the centre of your left eye’s pupil.If possible, use the PD rulers for the best results. Use the millimeter ruler i.e., rulers that are specially designed to measure distance or there are rulers available to measure the PD, known as PD rulers. Try to not use a normal ruler as it might not give you an accurate distance measurement. You can measure your PD at home with just a mirror and an mm scale. ![]()
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