The shape of human eyes is quite complicated and often subject to malfunctions difficult to prevent as presbyopia, a defect of the vision tied to aging that makes individuals perceive things from near in an incorrect way. Astigmatism, myopia and hyperopia are other defects tied to aging along with presbyopia. The multifocal contact lenses are the best solution to correct the vision defects mentioned above.
The multifocal contact lenses, also known as progressive contact lenses, are made of three parts. An upper part is conceived to provide a keen vision from afar. A central part, also known as progressive channel, is conceived to provide a keen vision from the middle distance. A lower part allows users to read newspapers and books, providing a keen vision from near as well.
Advantages of the multifocal contact lenses
The main advantage of the multifocal contact lenses is the correction of vision defects between -8 and +8 diopters and vision defects tied to astigmatism. This makes the multifocal contact lenses very popular among users. The multifocal contact lenses are also comfortable, so that users do not feel the presence of three part built lenses within their eyes.
The multifocal contact lenses are also neater than equivalent contact lenses, as the borders between the parts of the multifocal lenses do not damage the external look of users. Moreover, users of multifocal contact lenses do not need to wear two pair of glasses in order to see both from near and afar.
The multifocal contact lenses are also intended for everyone who suffer from the dry eye syndrome. Usually, the contact lenses make the eyeballs dry and lead to painful rednesses in so doing. However, the multifocal contact lenses provide a high degree of hydration because of an additional moisturizing system that makes eyes constantly hydrated and moisturized.
Disadvantages of the multifocal contact lenses
The huge number of advantages does not implicate the multifocal contact lenses do not have disadvantages. The main disadvantage of the multifocal contact lenses is a two week long period of adaptation, as the eyes often see images flowing and rocking when users start utilizing the multifocal contact lenses. The eyes also perceive the difference between the parts of the lenses during the first days of use of the multifocal contact lenses. Both a daily use of the multifocal contact lenses and a proper knowledge of the properties of this type of lenses are useful steps users can make in order to decrease the period of adaptation.
For users with anisometropia, a disease that occurs when the left and the right eyes have different vision defects, the adaptation of eyes to the multifocal contact lenses is quite hard. Therefore, the application of the trial and error method is recommended to users with anisometropia, in order to adapt the eyes to the multifocal contact lenses quickly. The use of the multifocal contact lenses also requires frequent movements of both the head and the neck in order to find the most proper point of view. Therefore, the multifocal contact lenses are not recommended to individuals with degeneration of the cervical spine.
The users of lenses with no degenerations of the spine and almost equal defects of both eyes should not have any problem while adapting eyes to the multifocal contact lenses. Once the adaptation period has been overcome, users definitively feel a high degree of comfort while utilizing the multifocal contact lenses.