Are Contact Lenses with Higher Water Content, Better?
Water content. One of the most important parameters when choosing quality contact lenses. Water moisturizes the lens, it makes them softer and more comfortable to wear. You might want to say that more water contains the better, but…there’s a catch!
Contact Lenses According to their Water Content
Depending on water content, contact lenses can be divided into three groups. Each group means a slightly different quality in contact lenses. Do you know which group your contacts belong to?
- Low water content (up to 45%) – modern silicone hydrogel contact lenses, used in contacts that are intended for continual wear. They have almost 100% oxygen permeability.
- Mid water content (up to 60%) – hydrogel contact lenses, suitable for most users.
- High water content (up to 90%) – hydrogel contact lenses for more sensitive eyes. Suitable for prevention of the dry eye syndrome
Chart of Water Content and Oxygen transmissibility (Dk/t)
What do you mean by that?
The ratio permeability of your lenses depends directly on their water content.
The more water contact lenses contain the more difficult it is for oxygen to get to the cornea where the surface is dependent on atmospheric oxygen.
If it can’t get to the cornea, a vascularization occurs (which is irreversible).
Chart of Contact Lenses According to their Water Content and Oxygen transmissibility (Dk/t)
And the other way around?
The less water contact lenses contain, the less comfortable they are. Especially by the end of the day, you might feel your eyes itchy and burning. Please keep in mind that water disappears in time, it evaporates from your contacts throughout the day.
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Thats one of the most interesting articles i ever readed online. I would like to add that i read somethere that 24,5 dkt is the idea spot for eye contact lenses. So you really dont need a contact eye lenses over than 100dkt. I used one colored lenses with only 17dkt and 38% of water and i did fine most of time. It was a hydrogel one. I would say that get a lenses with much more water is better than more dkt, cause its more confortable in general.