Raw materials contact lenses Dr. Nir Erdinast

Types of contact lenses – the raw material

There is a basic division in connection with the raw material: contact lenses and soft contact lenses.

  1. Contact lenses

Lenses are also difficult as oil – the raw material has Modlos (stiffness) high and small for soft contact lenses. Small diameter lens cornea and lens are more likely to be emitted in relation to a soft lens. All contact lenses are lenses fixed (annual).

  1. Soft contact lenses

Soft contact lenses are larger, water and soft chelate much more here very comfortable lineup. Large soft contact lens corneal diameter.

Soft contact lenses are divided into two main types:

  1. Soft contact lenses hydrogel type

Hidorg’l type of contact lenses (and non-commercial behalf: polyHEMA) Soft contact lenses are the most common. This raw material is composed of a small number of monomers connected connection crossover creating polymer chain. This raw material is very hydrophilic, inexpensive to manufacture, soft and steady change of temperature and pH. These lenses have a very low stiffness able to absorb water. Type of hydrogel contact lenses is very dependent on water transport oxygen. As we increase the percentage of water in the lens so that the oxygen crimes but still exceed the amount of oxygen to pass through the hydrogel contact lenses is not high enough.

Hydrogel contact lens-type protein deposits more attractive (compared to contact lenses silicone hydrogel type).

  1. Contact lenses silicone hydrogel type

Silicone hydrogel lenses watered for the first time in 1998 and since then their use has risen high. Contact lenses silicone hydrogel type have a composition of silicone hydrogel with different terms. The raw material from closely linking monomers of silicone hydrogel (although they are opposite in their programs because of Hidofili and other Hdrofobi) with the assistance of a mediator substance. This connection allows the creation of raw material has a coefficient of offenses oxygen (Dk) and five times higher than the offenses coefficient hydrogel contact lenses, plus other materials at low concentrations and various surface treatments (depending commercial company). Today, all contact lenses silicone hydrogel type (of all companies) outstanding high transmission of oxygen and thus avoid Contact lens complications Such damage likely to be caused hypoxia-type hydrogel contact lenses. Notable absence of contact lenses silicone hydrogel is a kind of toughness coefficient (modulus) of their higher. Contact lenses silicone hydrogel type are typically between 0.6 and 1.5 mega-pascal, and type of hydrogel contact lenses are up to 0.4 mega-Pascal. Toughness have direct contact lens comfort and corneal injuries that could be caused mechanical damage especially if there is a mismatch on the part of the practitioner. Initial development of the silicone hydrogel designed for use in the assembly and hold – sleep with contact lenses), but shortly after the professionals have embraced the use of daily compounding.

The information on the site is not meant to replace a visit or consultation with the practitioner or physician, consulting physicians involves a formal visit and inspection process for professionals. The information is intended to enhance the understanding and knowledge of myopia. Treatments and procedures described does not represent recommendations for medical treatment or medical procedure and their only purpose to provide information, descriptions and explanations about treatments and procedures generally accepted in the field of myopia.The site is protected by copyright, do not copy and / or quote and / or read and / or scan from any form of any kind, including photography, digital scanning, radiation and various electronic means without permission in writing from Dr. Nir Erdinast. Violation of the above will result in A legal action for breach of copyright.
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