How to choose contact lenses - choice of contact lenses
Almost every person who has vision impairment dreams to finally free himself from massive glasses and buy miniature and comfortable hydrogel products. Today they are very popular.
However, in order to translate this dream into reality, it is not enough to have the desire and the necessary amount of money, after all, before choosing the contact lenses, it is necessary to get approval from the ophthalmologist.
Indications for wearing contact lenses
As a rule, there are several reasons why a person with impaired vision is prescribed special lenses.
The reason is the first - a huge desire to switch from hated glasses to light and invisible contact lenses.
The reason is the second - a person visibly deteriorates the quality of vision, and he wants to adjust it by installing contact lenses.
Cause the third is a great desire to change your natural eye color to a brighter or more contrasting hue.
Reason fourth
- there is a desire to replace the outdated brand of contact lenses or go to a more refined type.It should be noted that when changing or selecting new contact lenses, in no case should one be guided only by their meager knowledge of these products. After all, recommend those or other lenses should be exclusively a professional ophthalmologist. It is necessary to consult him first of all for advice on how to choose contact lenses so that during the socks they bring only a feeling of comfort and give an aesthetic appearance.
lens selection criteria Currently, there are several criteria for choosing the right products for improving vision.
Criterion No. 1 is the radius of the .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. This is why, before buying contact lenses, you should always consult your ophthalmologist and determine the required quantities of these products.
Criterion No. 2 - diameter .As with the previous lens parameter, too large or small diameter of hydrogel products can lead to such a phenomenon as too hard landing.
Criterion number 3 - the arrangement 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 No. 4 - selection of a suitable 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 from 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 long service life, significant thickness and low moisture content. As a rule, they are available in glass bottles and can be used from six months to one year.
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 by a new one. Such lenses with a 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 period of time and cover it with biological molecules that protect the eye tissue from the negative impact of the lens.
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.