Eyeglasses help people with vision problems to see clearly. If you have a vision problem, you must wear eyeglasses otherwise you can’t see clearly. There are two types of lenses including polycarbonate and ultra-high index lenses. Polycarbonate lens won’t crack when it is susceptible to heavy impact. It is a common phenomenon for people to drop their eyeglasses accidentally. Therefore, getting an eyeglass made from a polycarbonate lens is important. If your eyeglass is made from ordinary plastic, it is fragile and can break when you drop them. Polycarbonate lens is often used to make children's eyeglasses. Children are active and will jump here and there every day. When they run, the eyeglasses will drop onto the floor and crack. To prevent the eyeglass lens from cracking, it is wise to buy one that is made from a polycarbonate lens. Ultra-high index lens allows you to wear eyeglasses with the ultra-thin lens. The ultra-high index lens is suitable for people that suffer from high prescription power. When your eyes suffer from severe vision impairment, the optometrist has to increase the thickness of the lens so that you can see clearly. The higher your prescription power, the thicker the lens will be. When your lens is thick, people will stare at it. If you don’t like people to pay attention to the thick lens, you should customize your eyeglass with ultra-high index lenses. The ultra-high index lens is a special plastic that does not require a lot of materials to make the eyeglass. It reduces the number of materials that are used in making the ultra-high index lens so the thickness of the lens can be reduced. Before shopping online, you should get a prescription from the optometrist. The optometrist will measure your eye power so that he can give you an accurate prescription. Without a prescription, you have to guess your eye power. As a result, you will buy the wrong eyeglass. You should shop online for eyeglasses because of the faster turnaround time. If you shop online, you will get the eyeglass within 10 – 14 days. If you shop at a traditional brick-and-mortar store, you will get the eyeglass within 1 month.