Contact lenses for hyperopia
Before putting on a MKL on the eyes, you need to wash your face and wash your hands with soap, then carefully wipe yourself. Any manufacturer of optics necessarily applies to their products the operating instructions, where there is a schematic picture of the order of actions that you have to perform. Follow the prompts and after a few seconds the lenses will be in place.
In the evening, before going to bed, the MKL should be carefully removed, also relying on the attached manual, and stored in a special solution. It has a typical composition and is sold in all large salons of optics. However, it is worth to clarify which particular drug is best for your type of MKL. Both the solution and the plastic container for lens storage must be replaced every 3-6 months.
Important: if you found signs of acute respiratory viral infection, flu, MKL and do not resume their use until full recovery!
Otherwise, you will very easily put the infection in your eyes. On the need to appeal to the ophthalmologist in case of the already existing symptoms of inflammation of the eyes and talk too much – this goes without saying. In addition, you should be alerted to any manifestations of discomfort, directly or indirectly associated with MKL, ranging from lacrimation, ending with headaches. Perhaps the lens does not suit you or stopped coming. Urgent visits to the oculist require such situations as sudden progressive deterioration of vision, pain and raspiranie in the eyeballs, a sharp aggravation of asthenopic syndrome.
h2 Lenses for age-long-sightedness
Elderly people Most of all, the question is, are there lenses for correction of presbyopia and concomitant visual disturbances, and what is better – to buy suitable glasses for a long time or to spend regularly on buying MKL?
. As for the functionality of modern contact lenses, they are in no way inferior to points, and in some respects even surpass them. For example, if we are talking about astigmatism against the background of hypermetropia. With such a common diagnosis among the pensioners, like nearsightedness and farsightedness at the same time, MKL also cope perfectly. Let’s look at how they do it.
So, presbyopia is corrected with the help of the following types of contact lenses:
Bifocal. Otherwise, they are called variables. These are the simplest of all MKLs designed to correct age-related pathologies of vision. In such lenses there are two optical zones: the upper one for the distance and the lower one for near. The disadvantages of bifocal MKLs include too sharp a transition, the absence of a segment for clear visualization of medium-distant objects, and a narrowing of the field of view. That’s why many older people can not get used to wearing such adaptations.
Multifocal. This is an improved version of the previous MKL. In addition to optical zones for near and far vision, there exists a third, “middle” zone, located between them. Adaptation to such products is usually easier, but it’s not always possible to look at the side objects very easily – you have to turn your head in the right direction instead of mowing it. To the disadvantages of multifocal MKL, of course, is also high cost.
Spherical. Such contact lenses are used to correct age-long-sightedness using the monovision method. The doctor determines which eye the patient best sees near, and which – in the distance. Then, for each eye, a lens is selected, which can provide, respectively, a clear near and far sight. When the human nervous system adapts to different MKL, the brain will choose itself, with what eye to look in this or that situation. The downside is that products of this type do not suit drivers because they can not guarantee full binocularity of vision.
Aspherical . In another way they are called progressive. Are made strictly individually, under the order. The central optical zone of these lenses makes it possible to see close to, and peripheral – far away. Moreover, the transition between them is smooth. This design takes into account the natural mechanism of narrowing and dilating the pupil. After all, when we look at closely located objects, our pupil narrows, and when we look into the distance, it expands. Aspheric MKLs are the most advanced and capable of providing even a high-quality side view. Of the disadvantages – only a high price and a fairly long period of addiction.
Concentric. Otherwise called circular and, in fact, are a modification of bifocal MKL, with the only difference that the optical zones for near and far vision are alternating 4-5 times concentric circles. At the same time, in the center of one lens there is a region “for near”, and in the center of the other – “for distance”, so that, like in the case of spherical MKL, the brain itself chooses the “leading” eye, depending on the situation. These items are not easy to get used to, and they are also not suitable for driving.
Toric lenses for farsightedness and astigmatism
Astigmatism is very complex violation of refraction, which is characterized by the presence of several points of focusing of refracted light rays on the retina or even a focal point in the form of a line, figure-eight, an irregular figure. Often this pathology is combined with other defects, including hypermetropia. So, there are lenses for farsightedness that can correct simultaneously astigmatism, and they act better than glasses, because they fit directly to the cornea, while glasses are removed from the eyeballs by about 12 millimeters, and this distance is bad for efficiency of optical correction.
Such devices are called toric contact lenses (TCL), made of the same modern materials as conventional MKL, have the same advantages: convenience, safety, clarity in zualizatsii. They can also be both transparent and colored. Only the design differs – a TLC of spherical cylindrical shape, that is, one lens has two optical forces simultaneously. The first value is responsible for correcting astigmatism along the desired meridian, and the second is responsible for correcting the concomitant pathology of refraction, in this case, farsightedness.
Important: the selection of toric contact lenses requires an in-depth examination of the ophthalmologist. Wearing such products is shown with astigmatism from 0.75 diopters and above. / H
Night lenses for farsightedness
This is a very special kind of optical products intended for temporary correction of visual impairment by the method orthokeratology. To use night contact lenses it is possible both with myopia (nearsightedness) and with hypermetropia (farsightedness). But they are not suitable for correcting the age-related pathologies of refraction, as in the elderly the cornea is usually already thinned, there may be other contraindications. The essence of the technique is to wear rigid gas-permeable lenses during the night rest. From the outside they look like ordinary MKLs, and the inner surface is shaped so that when the pressure on the upper layer of the cornea changes its curvature. If a person suffers from myopia, the night lens should flatten the cornea by pressing it in the central part. If the patient has hyperopia, then the effect is on the periphery, so that the center, on the contrary, arches outward. During the night, the cornea acquires the right amount of refraction, which persists throughout the day, providing a clear vision.
Important: wear nocturnal lenses for at least 8 hours. They are quite effective in myopia up to 6 dpt, hypermetropia up to +3 dptr and astigmatism up to 1.5 dpt. They can be used by patients at the age of 10-40 years, provided there are no contraindications.
Advantages of night lenses for hyperopia:
They do not need to be worn during the day as usual contact lenses or glasses. They are much less likely to provoke inflammatory reactions and complications in the form of dry eye syndrome or tear.
They are very convenient to use for women, since all the restrictions associated with makeup are not met. They can restrain the development of progressive myopia in children, over (except for those already mentioned, which are relevant for any type of similar products):
Keratoconus and keratoglobus
Corneal astigmatism 1.75 dptr and more.
Thinning or reduced sensitivity of the cornea.
In general, the orthokeratology technique is quite effective and safe, but it has ideological opponents. Some ophthalmologists believe that regular pressure on the cornea can lead to its accelerated wear, persistent distortion and the development of astigmatism. However, even if such a visual impairment occurs, it is usually reversible and passes by itself shortly after the refusal to wear nighttime contact lenses.
In any case, remember – if you have hyperopia, which lenses you better use, only a qualified specialist can recommend it based on the results of a full-fledged visual function study. Take care of your eyes, and be healthy!