Astigmatism is a violation of the shape of the cornea or lens. When their sphere is bent, the light on the retina is not collected at one point, but at several. Thus, the contour of the subject is blurred, becoming fuzzy. Patients, even those with normal visual acuity, cannot perceive objects clearly.
How to correct astigmatism
If the shape of the cornea is disturbed, cylindrical lenses are used. If light hits the parallel plane of the axis of such a glass, it does not refract. This happens if the rays have a perpendicular direction. This process is regulated by the position of the axis of the cylinder of the lens.
For many years, patients had only one therapeutic method for correcting corneal curvature. It consisted of wearing glasses with special cylindrical glasses.
After the start of production of contact medical devices, patients had more opportunities. They were able to combine lenses from myopia with cylindrical glasses. This was inconvenient and did not solve the issue of switching to contact optics.
There are currently lenses that help patients with astigmatism. They can isolated corneal curvature, and can additionally correct myopia. These are Acuvue for Astigmatism lenses .
Correction method selection
Historically, astigmatism is corrected by the use of glasses. Their selection is a complicated procedure. Glasses are made to order according to an individual recipe. Their big minus is the limitation of the fields of vision and motor activity. With significant astigmatism, the period of adaptation to cylindrical glasses may be accompanied by dizziness, nausea, pain for 2-3 weeks. Therefore, with significant deviations from the norm, it is customary to order several pairs of glasses, gradually increasing the correction.
Contact correction of vision is carried out using hard and soft lenses. The latter are most convenient, and among patients with astigmatism, their popularity is steadily growing due to comfort, wide visual coverage and freedom of motor activity.
The lenses shown in violation of the shape of the cornea differ from the usual toric (cylindrical) surface. They have additional packaging markings. An example is Acuvue Oasys for Astigmatism contact lenses. Both surfaces of such optical products are convex and arranged at different angles.
Like glasses, Acuvue for Astigmatism lenses have the correct cylinder axis set. Contact correction methods so thoroughly correct violations that are comparable to surgical ones in effectiveness, but do not have their side effects.
Varieties of Toric Lenses
Just like ordinary contact lenses, their cylindrical analogues are divided according to the material of manufacture into:
- hydrogel;
- silicone hydrogel.
The first are made from a polymer base with high hydrophilicity. Toric optical vapors pass oxygen well and retain a high degree of hydration of the eye. This is due to the high level of comfort in use. A classic example is Day Acuvue Moist for Astigmatism.
Silicone hydrogel is made from a special innovative base. Its unique characteristics make it possible to achieve the best oxygen supply and eye hydration. Contact lenses Acuvue Oasys for Astigmatism have a modern basis, which allows to increase the time of their use. In this case, this will occur without damage to the eye.
Lens wear
Acuvue for Astigmatism lenses can also be classified by the time that they can be used before disposal.
Lenses are distinguished:
- one day;
- scheduled replacement.
In the first case, the name implies that the maximum life of the products is 24 hours. Day Acuvue Moist for Astigmatism lenses can be used during this time. They are comfortable to wear and do not require additional care. They are disposed of in a day, even if only 2 hours were used during this period.
A variety of contact optical material used for the production of planned replacement lenses can be used for up to a month. During this period, it is necessary to carry out special treatment with disinfectants. Acuvue Oasys for Astigmatism lenses are stored in containers for each eye separately. Containers are also subject to handling.
What are the criteria for choosing lenses for astigmatism?
The selection of contact lenses for the correction of astigmatic disorders is carried out only by a doctor. The ophthalmologist determines the optical power radius and lens curvature. It specifies the characteristics of the cylinder and the degree of the lens. Only the totality of the information received will help to select the necessary corrective pair.
You need to know that the lenses for each eye are selected individually. Toric cone can be installed only on the product for one organ of vision or for both.
Thanks to the development of technology, the curvature of the cornea can now be corrected by contact methods. All Acuvue for Astigmatism lenses are precisely held in position, do not change during the day. This was made possible thanks to a unique stabilization system. Thanks to her, the image does not lose clarity with any change in body position. Lenses allow you to engage in outdoor sports. Contact correction methods reduce the ingress of allergens, dust and irritating substances into the eye. A clear image when using such lenses can be achieved, regardless of visual acuity.
Features of one-day models
Acuvue Moist for Astigmatism lenses provide a complete sense of freedom and full clarity of objects. They improve vision, and protect the eye from drying out. Correcting vision, they do not need additional care, easy to use. This saves time and does not require storage conditions due to one-time use. Acuvue Moist for Astigmatism lenses provide protection against UV radiation and drying out. Substances on their surface are removed and destroyed along with them at the end of each day. They are convenient to take on trips, business trips, vacations. In this case, lens care is not carried out, a new pair is used daily, taken from a sterile package.
Astigmatic lenses for several days
Acuvue Oasys for Astigmatism lenses also successfully correct corneal curvature. They have increased smoothness of the latest silicone hydrogel substrate. Such lenses make the image clear and comfortable to use. The developed system of instant stabilization successfully holds the lens in the necessary position relative to the axis. Therefore, Acuvue Oasys for Astigmatism toric lenses have a shorter adaptation time and better consumer reviews. Their effect is especially noticeable when used in dry air (air conditioners, heating, airplanes, etc.) and prolonged use of the computer.
Acuvue Oasys for Astigmatism toric lenses provide smooth eyelid glide and an optimal fit while observing the cylinder axis. A stable clear picture of the surrounding reality is achieved without deformation and errors. These lenses, due to the material used in the production - silicone hydrogel, provide ultraviolet protection at the highest level.
Astigmatism is a disorder that, if not corrected, can progress and lead to strabismus. Choosing any of the above models, you can get a full correction of pathology and visual acuity at the same time as freedom of movement and breadth of view, as well as protect your health for many years.