Nowadays, more and more people choose to buy eyeglasses online, either prescription or non-prescription types. The Internet does offer some benefits for online customers. There are currently online sunglass stores, prescription glass stores and goggles shops. It is easy to sell those non-prescription glasses such as sunglasses and protective goggles, because they do not need a prescription from the customer. It is still simple to provide single vision spectacles online because a prescription solely for nearsightedness or farsightedness is not complex enough. It is amazing that there are currently many vendors selling multifocal eyeglasses online. Bifocal glasses, trifocal glasses as well as progressive spectacles are available on the Internet. It is absolutely true that these multifocal eyeglasses require more complex prescriptions. The most complex type is certainly online progressive eye glasses.
Featuring seamless power progression and no visible lens lines, progressive eyeglasses are attracting a large amount of customers. In addition, those progressive glasses sold online further attract individuals by means of offering competitive prices. It is reasonable for some customers to buy discount progressive glasses from an online store, for these glasses usually charge higher prices than regular ones and bifocal or trifocal ones. But at the same time, buying online prescription eye glasses requires some precautions because these glasses are so special. There are only certain factors that are under the control of customers who try to purchase a pair of progressive glasses online. They can choose a lens material from regular plastic, glass, polycarbonate, high-index and photochromic types. Actually, the thickness of lenses made of high index materials can be decided by the index. The higher the index, the thinner the lenses. For instance, 1.74 index lenses are normally 50% thinner than 1.50 lenses. Another decision that can be made by an online customer is the progressive technology. There are mainly Traditional Progressive and “Wide View” Free Form Progressive. The latter type is less likely to cause visual distortion.
On the other hand, there are some shortcomings of buying online progressive eye glasses. It is widely known that progressive glasses are designed with a gradient of powers. In most cases, such a gradient should be adjusted according to specific wearers. Both the addition power and the length of the power gradient should be customized for individual wearers. These factors are generally out of control when customers buy progressive glasses online. In addition, it is very likely that a customer still need to make a further adjustment even if he has received a pair of online progressive eye glasses.