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Pupillary Distance (PD) is the distance (in millimeters) between the centers of the pupils in each eye. This specific way of measuring is employe when getting ready to create prescription eyeglasses. Placing lenses accurately in relative to the centre of the pupils is mainly crucial for higher power lenses due to the position of the optical centre of the lenses. A PD measurement makes sure that the center of the lenses line up with the center of your pupil. The Pupillary Distance needs to measure first before your prescription lenses are cut into the form of your frame. This kind of measurement is utilize so that the optical center of each lens can lined up with your pupils in order to give maximum visual quality.
Progressive Eyeglasses was a huge leap forward in terms of advances in corrective eyewear. Three focal distance areas are combine into a single lens, resulting in the following: The upper part of the lens is focused in viewing objects at a distance, the center part is for medium-distance viewing capacity (e.g., scanning book titles on library shelves), and the lower area of the lens is optimize for closer viewing distances, (e.g., reading text on the computer monitor).
Through this type of multi-focal lens, the user is provided with a more realistic viewing experience. Since it gives more power to view different types of distances seamlessly. For example, a person standing across the room can clearly seen when gazed at. Moving your head a bit afterward to check what your typing on the PC is a simple task. And then tilting your head downward to continue your reading is as easy as 1-2-3. This results to a smooth and seamless transition of lens powers. Enabling the user to change focus from different viewing distances much more faster and comfortable.