subject: Evaluation Of Reading Glasses [print this page] Reading glasses are needed for those who can not view close materials clearly. With naked eyes, these people have to hold books or newspapers an arms length, in which distance these materials can be clear. There are still some people squinting to read something in the distance. For these individuals, eye checkup is necessary.
Some people are new to reading glasses that an eye exam will give them an exact prescription of reading glasses. For those using glasses already, a higher prescription is needed. Whether in which condition, it is needless to worry about additional loss caused by wearing reading glasses. Choosing a proper pair, both charm and personality will not be affected.
Non-prescription reading glasses come in two basic categories: half glasses and full glasses. Full reading glasses offer vision correction at the entire lens thus clear vision can be ensured all the time. The shortcoming of this type of reading glasses is that distance vision can be blurred or even distorted. In order to get clear distance vision, the wearer must take off full reading glasses, which is quite inconvenient.
Half reading glasses are designed to offset this problem. This type only offers vision correction at the lower half of a lens, which is used to read near materials. The upper half of a half reading lens has no prescription, so that the distance vision will not be interfered. This advantage of half reading glasses eliminates the wearers needs to constantly remove their glasses. But it is also obvious that half reading glasses offer a smaller space of vision correction.
There are custom-made and ready-made reading glasses on the market. Always provided on a mass basis, ready-made reading glasses are much cheaper than customized ones. But defects are quite common in ready-made reading glasses. Bubbles and waviness can cause distorted vision. Some other defects may force the wearer to get tired more easily.
