Prescription Glasses |
What You Need to Know before Buying Prescription glasses OnlineNowadays, buying prescription glasses online is very common. If you buy prescription glasses from the online store, you will be able to save a great deal of money. Modern technology has made it possible to purchase prescription glasses online. Most online stores offer designer glasses so you don’t have to visit different stores in your neighborhood. Before you can choose the lens, you must choose the frames. Each frame suit a different face shape. For example, people with round face should wear angular eyeglass frames to make the face look thinner and longer. People with an oval face will look nice no matter what types of frames they wear. If you have an oblong face, you should wear frames with a higher depth compare to the width. People with base down triangle face can opt for glasses that have heavy accent of color. If you have a base up triangle face, you need to buy frames that have a wider bottom and light colors. If your face have a diamond shape, you can try rimless frames. Oval and cat eye shaped frames are also suitable for diamond shaped face. If you want to purchase the lens, you need to obtain the prescription from the optometrist. It is important that you understand the jargon of the prescriptions including Sph, Cyl, axis, and add. The sph, also known as sphere refers to the correction of your nearsightedness or farsightedness. The sph value is describes in – or + signs. The value will increase in 0.25 steps, for example, 0.25, 0.50 and etc. The cyl value is used by people that already have a correction value. The axis is the correction value that you need to set. The axis value ranges from 0 – 180. The prescription glasses store will also request you to enter the papillary distance. The papillary distance is the distance between the center of the left eye pupil and the center of the right eye pupil. Many prescription don’t mention the PD measurement. The optometrist doesn’t include the PD measurement to encourage customers to buy from them. If the prescription doesn’t include the PD measurement, you can take the measurement by yourself. You can have your friend help you to measure the PD distance. Your friend should sit at the same height as you. After that, he should place a ruler between the nose bridge. The ruler should be held upside down. The best PD result is taken by looking at the nose bridge of the person that is placing the ruler between your eyes.
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