contact lenses applying removing and cosmetics

Periodic cleaning is the important part of care of contact lenses, however, unfortunately far not always observed. The tendency to formation of adjournment on lenses causes of their cleaning. Irregular cleaning accelerates formation of adjournment and leads to a number of negative consequences. For the best understanding of functions of cleaners it is necessary to understand the mechanism of formation of adjournment at first. Adjournment on lenses are defined as a cover, a surface or the matrix formation which is not washed off by a plaintive film at blinking.

The factors influencing formation of adjournment.

It is important to mean, that such factors set. Four of these factors the following:

Change depending on the patient;
Material of which the lens is made;
Mode of care of lenses;
Environment.

Changes depending on the patient.

Such changes are rather considerable. The form and degree of adjournment at each patient the different. Some patients seldom clean lenses and, nevertheless, do not observe increase in adjournment. Others apply a cleaner some times in a week and are compelled to change often lenses owing to formation of adjournment. At the third adjournment during very short time are formed.

Adjournment

Any cover, surface or the matrix formation which is not washed off by a plaintive film at blinking. Distinctions in formation of adjournment cannot be always carried into the account of leaving of the patient for the lenses, these distinctions can speak also features of individual chemistry of a body of the patient. Just as some people have predisposition to formation of a tooth stone or hardening of the arteries, some people have predisposition to formation of adjournment on contact lenses.

Material for manufacturing of lenses.

Formation of adjournment also depends on a material of which lenses are made. Adjournment are usually formed on RGP and firm lenses while albuminous adjournment are more likely formed on soft lenses. Soft ionic lenses with the high maintenance of water absorb much more fibers, than not ionic soft lenses with the low maintenance of water.

Leaving mode.

The leaving mode can influence formation of adjournment also. The patient not capable regularly to clean a lens more likely receives accruing adjournment. Besides, the system of thermal disinfection leads to acceleration of formation of albuminous adjournment on soft contact lenses.

Environment.

Environment factors: air pollution and flower pollen can influence also type and degree of formation of adjournment on lenses. The dehydrated medium leads to formation of adjournment at some patients. Additional factors include: cosmetics application, for hands and some preparations for an oral cavity.

Clinical value of the adjournment formed on contact lenses.

Researchers have come to conclusion, that in six months of carrying of soft contact lenses of 50 % of clinical symptoms depend on formation of adjournment. Adjournment on the contact lenses used by patients, speak action of one or several above-stated factors.

Dryness of an eye often name insufficient quantity of tear for maintenance of a comfortable condition of an eye. More the general definition of dryness of an eye says, that this disease is caused or insufficient volume of a plaintive film, or infringement of quality or stability of a plaintive film. If the plaintive film well functions, it provides comfortable carrying of contact lenses. Infringements of a plaintive film, in turn, are connected with inflammatory reactions, changes in integrity of a surface of an eye and difficulties for comfortable and safe carrying of lenses.

Evolution of our representations about dryness of an eye

One of attempts to classify clinical displays of dryness of an eye has been made Holly and Lemp which have allocated five categories of a syndrome of a dry eye. The first category - deficiency when is broken wettability of a surface of an eye. The second stability of a plaintive film is broken because of insufficiency or a layer. The third category - deficiency of a liquid when in a plaintive film the volume of a liquid phase is lowered. The fourth category - anomaly of a century or infringement of function of blinking when distribution of a plaintive film on an eye surface suffers. Last, fifth category - anomaly of a surface of an eye when the changed surface breaks stability of tear. Though classification of a syndrome of a dry eye was intuitively useful at the characteristic of various clinical types of dryness of an eye, the instructions on importance of a plaintive film as surface-active layer which the physical, physical and chemical phenomena or some conditions of a surface of an eye can be broken nearby became its greatest achievement. As the understanding of pathological conditions of dryness of an eye has improved, definition of disease of a dry eye became more detailed. The recognition of a role of plaintive secretion and its dependence on integrity of a surface of an eye has changed this definition. The recognition also an integrated role of an inflammation both plaintive bodies, and eye surfaces has placed new accents in definition of dryness of an eye. The best practical definition of dryness of an eye sounds today so: Dryness of an eye is a dysfunction of interaction of a surface of an eye and plaintive glands which leads to inflammatory secretion of necessary components of a plaintive film with the subsequent damage of a surface of an eye, and also to occurrence of symptoms of irritation of eyes and discomfort.

Syndrome of a dry eye

The dry eye caused by deficiency of a water phase in tear. As our understanding of clinical signs of dryness of an eye has improved, has improved as well understanding of anomalies of a plaintive film, plaintive glands and an eye surface. Completion of volume of tear was a therapy basis for many years. With that end in view applied various types of liquids, including more difficult combinations of polymers, such as greasing substances. The recognition of that fact, that a plaintive film it is not simple water, and the structure consisting of three components: a liquid and elements, has led to an estimation of function of tear not only as to a washing and protecting liquid, but also as auxiliary and supporting film for an eye surface. The tear chemical compound was defined taking into account structure of electrolits and other dissolved substances developed by plaintive glands or getting to tear owing to leak from vessels. Low level of the proteins typical for a plaintive liquid was found out in patients with dryness of an eye in tear. Research of interrelation of dryness of an eye with a system condition allows to judge predisposition and the starting mechanism of development of the inflammation conducting to a dry eye. It has helped to explain the big disease of dryness of an eye at men and women in advanced age and at women in a postmenstrual pause. Moreover, data speak about especially at their use in the form of local therapy, can render anti-inflammatory effect and improve symptoms of a dry eye. Clinical tests of androgen-containing preparations now proceed.

The dry eye caused raised tear of tear Raised evaporation which involves instability of a plaintive film and dryness of an eye, is observed at disease of glands, carrying of contact lenses and at infringements of mobility of a century. The raised evaporation of tear is often aggravated with deficiency of a liquid at dryness of an eye as these illnesses often arise simultaneously.

Dryness of an eye and contact lenses

Successful carrying of contact lenses depends on integrity and stability of a plaintive film. Finally, the plaintive film is responsible for greasing and hydration of contact lenses. Hydration of a lens and a tear exchange under a lens provide transport of necessary quantity of oxygen to a surface of an eye and removal from an eye surface. Contact lenses increase evaporation of tear and can accelerate occurrence of dryness of an eye. Long carrying of contact lenses can reduce sensitivity of a cornea and break normal balance between reflex secretion of tear and an eye surface. Thus, the less contact lens changes normal sensitivity of a cornea and tear physiology, the better shipping of a lens. One of the most widespread reasons of intolerance of contact lenses and refusal of their carrying is dryness of an eye and the instability of a plaintive film caused by a pathology of glands. The control over a condition of eyelids and improvement of stability of tear can eliminate available problems and to improve shipping of contact lenses. Carrying of contact lenses will be successful at patients with a normal plaintive film and function of eyelids. The most transferable and safe contact lenses will be lenses which is better are compatible to a plaintive film and least break stability of a normal plaintive film.



Interrelation of a contact lens and quantity/quality of a plaintive film which it is washed, is a contact lens solving for safe carrying. The understanding of a clinical picture and changes at dryness of an eye can help to avoid or prevent intolerance of contact lenses and to improve results of carrying of contact lenses. Both it is important to doctor, and patient to reveal possible risk factors of development of dryness of an eye and to compensate as far as possible infringements of stability of a plaintive film.

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