Rigid lenses

A few decades ago, rigid lenses were made only of polymethylmethacrylate or glass. They did not miss oxygen and were very uncomfortable to wear, as they had to be periodically boiled and treated with special cleaners. Today, hard contact lenses are made of materials produced on the basis of silicone. They have a fairly high gas permeability and have a lot of positive qualities.

Advantages of hard lenses

Rigid contact lenses for vision correction have such advantages:

1. Durability - since the material from which they are made is dense, they perfectly hold the shape.
2. Image stability - these products do not crumple when blinking, so the image is always clear.
3. Resistant to protein deposits - they are resistant to substances that come to their surface from tear fluid, so the period of safe and comfortable wearing of lenses is significantly increased.
4. A small diameter - this makes the outer peripheral zone of the cornea more open for oxygen access and a tear that will wash off dead cells and small foreign particles.
5. Durability - the lifespan of any hard night and daytime lenses is limited only by changes in the user's vision.

In addition, this corrective optics does not contain water. They do not dry out in the wind or in hot weather, which allows you not to use moisturizing drops.

When is it better to wear hard lenses?

In some cases, hard lenses, made on the basis of silicone, provide a better quality of vision than their soft counterparts. Such optics are preferably used for:

• orthokeratological correction;
• pronounced astigmatism (if the necessary correction by soft lenses can not be achieved);
• age-long-sightedness;
• keratoconus (corneal disease, in which it is depleted or deformed).