Thanks to the rapid development of the internet, shopping online has never been easier and more money-saving. With convenient step-by-step online guidance, nowadays people can not only buy finished products such as electronics or clothing online, but also eyeglasses with complex prescriptions. However, some people may still hesitate as they are not quite sure what to order with their prescription. Here are some hints that will help you understand your eyeglasses prescription and save you hundreds of dollars from online shopping. Some online eyeglasses stores have unbelievable prices starting from $7.95 including prescription lenses!
First, let's find out what kind of eyeglasses you need based on your prescription. The prescription is normally made up of 5 parts, SPH, CYL, AXIS, ADD, and PD. However, not all values are necessary except PD so don't worry if missed out on certain values.
– Only have SPH, CYL and AXIS
If you only have SPH, CYL, and AXIS values, or sometimes only SPH values. Single-vision eyeglasses are what you are looking for. With negative SPH values the eyeglasses are used to watch long distances such as driving, and positive SPH values are most for close-up reading. CYL and AXIS are used for cylindrical correction, not every eyeglasses user would require this correction.
– With all SPH, CYL, AXIS, and ADD
If you have ADD included in the prescription, which stands for reading addition, you may want to order bifocal or multifocal eyeglasses. While bifocal eyeglasses give two focus points for distance and reading, multifocal or varifocal eyeglasses offer gradually changing focus from distance to intermediate and finally close-up reading. People should choose the lens type wisely based on their occasions. For instance, bifocals are better for driving since they have better side views while multifocal normally have little distortion on the side.
Nevertheless, if you only want a pair of single-vision eyeglasses even if you have ADD on the prescription. Simply ignore the ADD if you want eyeglasses for distance only, or add on the ADD to the SPH for reading-only eyeglasses.
– PD
PD stands for pupillary distance, which is an important measurement that helps place the lens center in front of the pupils. If there are two PDs given, use the big one for distance and the small one for reading. Indicate both for bifocals and multifocal eyeglasses.
If you are still not so clear with the above recipe, you may go to www.cheapglasses123.com/ to contact their professional customer service to help you. They can answer all your questions and also will provide you the relevant suggestions on the choice of lens and frames. We trust you will have a pleasant conversation and shopping with them.
