The number of individuals who need vision correction is still on the increase across the globe. Eyeglasses with vision correction function have been an indispensable part of daily lives for many people. Some individuals may have difficulty in reading newspapers or deciphering symbols on a traffic sign without the help of corrective lenses. Even if they have an inherent need for eyeglasses, these people may not know how these glasses are made.
The first step is to perform an eye exam, during which an eye care practitioner will determine a patient’s prescription. This measurement is essential to produce lenses with precise vision correction. After that, the prescription will be sent off to a laboratory. An eye prescription contains several numbers, which determine what type of prescription blank should be used to meet the corrective requirements. Usually made of impact resistant plastic, the prescription blank is flat on one side and curved on the other.
In addition, the exact prescription measured by an eye doctor also determines the thickness of the blank lenses to be performed. A technician first makes the lens blank to provide the corrective properties according to the prescription. In other words, this step is responsible for creating the appropriate curvature of the lenses.
The next step is to trim the lens edges in order to fit the frames chosen by the patient. At the same time, special lens treatments such as UV protection can be applied. And then fit the lenses securely into the frame, during which heating may be needed. After successful lens installation, it is the time to package the eyeglasses and ship it.
During the whole process of eyeglass production, the most critical tasks are those done by the technician. Any tiny error may render a pair of eyeglasses. Proper care of eyeglasses is then passed to wearers once they have been sold.