Realcon
In recent years, silicone-hydrogel lenses have attracted more and more consumer attention. Being an improved version of its predecessors – hydrogel lenses, Lenses made of silicone-hydrogel are superior to them in a number of indicators. However, The percentage of silicone content in lenses from different manufacturers can vary markedly, and in some cases be significantly underestimated. How to determine, whether the product lives up to its name?
One of the key differences between silicone-hydrogel lenses is a high level of oxygen permeability. Silicone-hydrogel lenses are rightfully considered to be more fluid, their DK/t is from 80 units and above, and for some representatives of the new generation of contact lenses, the data can be close to 100DK/t. Hydrogel lenses, on the other hand, have oxygen permeability of only about 20 DK/t, And increasing the level of comfort during use is only possible by adjusting the percentage of moisture content, located, Usually, within 40-60%.
To recognize products made of silicone-hydrogel, It is necessary to take into account that, that at present this material is used mainly for the manufacture of lenses for a month or one day. The reason is, that due to its properties, silicone-hydrogel does not have sufficient wear resistance and is not suitable for the manufacture of lenses for prolonged wear.
In recent years, lenses have become widespread, made of non-ionic materials. However, With all their positive properties,, Worth considering, that in terms of oxygen permeability, such lenses are similar to hydrogel lenses.
Selection of lenses in each case – The process is individual, Depending on many factors. Moisture content, oxygen permeability, As well as the contact lens material itself – Important indicators, influencing the choice of optical products. However, Do not neglect the advice of a specialist, This will help not only to support eye health, but also choose lenses, that are right for you.