July 20, 2012

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Criteria for selecting contact lenses

Your Goal: Normal Vision

Currently, there are several criteria for choosing the right products for improving vision.

Criterion No. 1 is the radius. As you know, there must be a distance between the contact lens and the cornea of ​​the eye. It is generally accepted that the norm of this gap is 0.8 -1 millimeter. At first glance, this distance may seem quite insignificant, but it depends on it the clarity of the image and the mobility of the lens itself. It is worth noting that after installing the product by eye, this gap is filled with tear fluid.

In addition, it should be clarified that in the process of wearing a lens, it must necessarily move to the sides by about 0.5 or 1 millimeter, and then again centered on the cornea. If this does not happen, then, most likely, this part has too hard landing because of the large radius. This state of affairs may pose a great danger to the human eye. That is why, before buying contact lenses should always consult with your ophthalmologist and determine the desired quantities of these products.

Selection of contact lenses

Criterion number 2 - diameter. As with the previous lens parameter, too large or small diameter hydrogel products can lead to a phenomenon such as too hard landing.

Criterion number 3 - the location of lenses. Not all lenses are located on the cornea centered. And, as you know, this fact threatens with vague images and further problems with the eyes.

Criterion number 4 - the choice of a suitable type of lens. Many do not know that contact lenses differ from each other not only by certain parameters, but also by the material from which they are made. It is on this depends on the period of their operation and the necessary frequency of lens replacement.

Types of contact lenses

Currently, there are the following types of lenses.

Conventional contact lenses. Such products for vision improvement are characterized by a long service life, substantial thickness and low moisture content. As a rule, they are produced in glass bottles and can be used from six months to one year. Manufacturers of frames and lenses. All Eyes are an example.

Contact lenses with replacement. These products are sold in a set of several pairs. One such pair can be worn for about three months, and then replaced with a new one. Such lenses with replacement should be removed at night, and in the morning again installed on the cornea.

Contact lenses with frequent replacement. Typically, these lenses change to new after 3-5 weeks of use. In similar products you can sleep, and also clean them not with a special, but with a multifunctional solution.

Daily lenses. These products must be changed every day. The advantage of such lenses is that they do not require any care. The negative side: the eyes do not have time to get used to this part in a short time and cover it with biological molecules that protect the eye tissue from the negative impact of the lens.

What contact lenses are

It is also worth noting that when choosing the right products for improving vision, you should always pay attention to the material from which this or that lens is made. In addition, the choice of these details depends on the result that you expect from them: improving the quality of vision or changing the natural color of the eyes.