![]() Most opticians have a preference when it comes to taking these measurements, but the consensus for many is to use monocular PDs. ![]() Should I take monocular or binocular PDs? If such an asymmetry exists, it is always a good idea to make a note of this in the patient’s chart or on the order sheet to avoid any confusion.ģ. If you are confident with the way your patient has the instrument rested and centered, then you should be thinking about the possibility of an anatomical asymmetry. If the pupillometer isn’t properly rested against the patient’s nose, you can get skewed measurements to one side or the other. It is important to consider the method in which you present the pupillometer to the patient. Why are my measurements so different between the right and left eye? ![]() This adjustment when taking pupillary distance prevents any induced prism that you would otherwise get if you were to use the patient’s distance PD instead of near.Ģ. This is changing the way the patient converges so the patient is viewing through the optical center of the lens when doing near work. For example, if your patient is getting a pair of single vision reading glasses for general use, you would move the dial on the pupillometer from ∞ (infinity) to 40 cm. If the patient is using these as reading glasses, you need to adjust your pupillometer to be representative of the distance at which they intend to read. Is the patient using these glasses for distance, near, or both? When it comes to PD measurements, here are a few questions you should consider:ġ. It is also just as important to take a more general look at the patient for any asymmetry that may exist, such as a crooked nose, head tilt, vertical displacement of one eye relative to the fellow eye, etc. This is because the PD on an auto-refractor, can be skewed, especially if the patient backs out of the chin rest between measurements. While optometrists may check PDs by hand with a PD stick or use the PD taken during pre-testing, it is important to understand that the PD measurement in a patient’s exam chart should never be one that is referenced for frame measurements. Either way, the goal should be to get it right the first time! If this measurement is off by the slightest bit, it can lead to unwanted prism and can leave your patient thinking they didn’t get a good refraction or that the staff doesn’t know what they’re doing. The most fundamental measurement is the interpupillary distance, referred to as the pupillary distance, or PD. While the optometrist can provide an accurate refraction and glasses prescription to a patient, inaccurate measurements will result in poor acuity (and more!) for the wearer upon dispense. Taking accurate frame measurements is a critical element when making a new set of spectacles for a patient. What is going through your mind right now? If you feel terrified, or even nervous, about taking measurements for lens ordering, then this article will help ease some of the anxiety that inexperienced doctors get when it comes to ophthalmic fitting. You walk up to the front desk to see what else is on the books for the afternoon when a patient approaches you and says she has found a pair of glasses and is ready to purchase. Picture this situation: Your small, but thriving, private practice has two opticians, both of whom are busy helping other patients.
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