Broad vision and clear eyesight is the biggest advantage of the contact lens. However, faced with the intense pace of life and heavy workload, our eyes are easily overburdened. The contact lens has direct influence to the cornea and conjunctiva. Once the prescription process is not standard, there will be endless troubles. If you want to escape from the symptoms such as vision fluctuation and corneal infection, much emphasis and attention should be placed upon the optometry phase.
Contact lens is not common commodity. Before purchase, you should go to the regular hospital to accept inspection. During the inspection, you need to understand one by one the eyesight, eye care habits, past medical history, etc. After evaluating the ocular surface and fundus condition, eventually it could decide the diopter and give advice. Through the detailed inspection of the eyes, it can judge whether it meets the wearing conditions and know which type of lenses is suitable.
Although many people use directly the diopter of the frame glasses for conversion, we still suggest to decide the diopter though the optometry in order to prevent from the inappropriate diopter and add pressure to the eyes . Currently the contact lens on sale are mostly one piece one package, which could solve well the problems of inconsistent degrees of the two eyes.
The contact lens with the same degree could have different parameters and the wearing influences could be distinct as well. Generally, center thickness, coloured diameter, base curve is not that important, while the parameters such as material, disposal period and oxygen permeability have effects on the matching degree and comfort level of the contact lens, which the high attention should be paid to it. Since there is big difference between the online and offline price, you could choose freely according to your needs, but you should be careful to purchase the products with formal qualifications.
Contact lens should not be purchased randomly. You need to have standard inspection, choose contact lens with high quality and operate according to the instructions in order to prevent from the damage to the cornea.