Astigmatism is a violation of the shape of the cornea or lens. When their sphere is curved, the light on the retina is collected not at one point, but at several. Thus, the contour of the object is blurred, it becomes fuzzy. Patients, even with normal visual acuity, cannot perceive objects clearly.
How to correct astigmatism
Cylindrical lenses are used in case of violation of the shape of the cornea. If light enters the parallel plane of the axis of such glass, it is not refracted. This happens if the rays have a perpendicular direction. This process is controlled by the position of the axis of the lens cylinder.
For many years, patients had only one therapeutic option to correct corneal curvature. It consisted in wearing glasses with special cylindrical lenses.
After the start of the production of contact medical devices, patients have more options. They were able to combine lenses for myopia with cylindrical glasses. It was inconvenient and did not solve the issue of switching to contact optics.
Currently there are lenses that help patients with astigmatism. They cancorrect the curvature of the cornea in isolation, and can additionally correct myopia. These are Acuvue for Astigmatism lenses.
Selecting a correction method
Historically, astigmatism has been corrected with glasses. Their selection is a complex procedure. Glasses are made to order according to an individual prescription. Their big disadvantage is the limitation of the fields of vision and physical activity. With significant astigmatism, the period of adaptation to cylindrical glasses may be accompanied by dizziness, nausea, and 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 the most comfortable, and among patients with astigmatism their popularity is steadily growing due to comfort, breadth of visual coverage and freedom of motor activity.
Lenses shown in violation of the shape of the cornea differ from the usual toric (cylindrical) surface. They have additional packaging markings. Acuvue Oasys for Astigmatism contact lenses are an example. Both surfaces of such optical products are convex and located at different angles.
Like glasses, Acuvue for Astigmatism lenses have the correct cylinder axis. Contact methods of correction are socarefully correct violations that are comparable to surgical in efficiency, but do not have their side effects.
Varieties of toric lenses
Just like ordinary contact lenses, their cylindrical counterparts 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 pairs pass oxygen well and maintain a high degree of eye hydration. This results in a high level of user comfort. A classic example is the Day Acuvue Moist for Astigmatism lenses.
Silicone hydrogels are made from a special innovative base. Its unique characteristics allow you to achieve the best indicators of oxygen supply and hydration of the eye. Acuvue Oasys for Astigmatism contact lenses have a modern base that allows you to increase the time of their use. In this case, this will happen without damage to the eye.
Lens wear time
Acuvue for Astigmatism lenses can also be classified by how long they can be used before disposal.
Highlight lenses:
- one-day;
- scheduled replacement.
In the first case, it is clear from the name that the maximum service life of products is 24 hours. Day Acuvue Moist for Astigmatism lenses may be used during this time. They are comfortable to wear and do not require additional care. Are disposed ofin a day, even if only 2 hours were used during this period.
The type 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 processing.
According to what criteria are lenses selected for astigmatism
The selection of contact lenses for the correction of astigmatic disorders is made only by a doctor. The ophthalmologist determines the indicators of the radius of optical power and the curvature of the lens. It specifies the characteristics of the cylinder and the degree of the lens. Only the totality of the information received will help you choose the necessary corrective pair.
You need to know that the lenses for each eye are selected individually. The toric cone can only be installed on the product for one organ of vision or for both.
Thanks to advances in technology, corneal curvature can now be corrected with contact methods. All Acuvue for Astigmatism lenses are precisely held in the right position, do not change it during the day. This was made possible thanks to a unique stabilization system. Thanks to it, the image does not lose clarity with any change in body position. Lenses allow you to engage in mobile sports. Contact correction methods reduce the ingress of allergens, dust and irritants into the eye. A clear image can be achieved with these lenses, regardless of sharpness.view.
Features of one-day patterns
Acuvue Moist for Astigmatism Lenses give a complete sense of freedom and complete clarity of objects. They improve vision and protect the eye from drying out. Correcting vision, they do not need additional care, they are easy to use. This saves time and does not require compliance with storage conditions, due to one-time use. Acuvue Moist for Astigmatism lenses provide protection against UV radiation and dryness. Substances that have fallen on their surface are removed and destroyed with them at the end of each day. They are convenient to take on trips, business trips, vacations. In this case, the lenses are not cared for, a new pair is used daily, removed from the sterile package.
Astigmatic lenses for several days
Acuvue Oasys for Astigmatism lenses also successfully correct corneal curvature. They have the enhanced smoothness of the latest silicone hydrogel substrate. Such lenses make the image clear and comfortable to use. The developed instant stabilization system successfully holds the lens in the required 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 when working at a computer for a long time.
Acuvue Oasys for Astigmatism Toric Lenses provide a smooth lid gliding and optimal fit withmaintaining the position of the axis of the cylinder. A stable clear picture of the surrounding reality is achieved without deformations and errors. These lenses, thanks to the material used in the production - silicone hydrogel, provide UV protection at the highest level.
Astigmatism is a disorder that, if not corrected, can progress and lead to strabismus. By choosing any of the above models, you can get a full-fledged correction of pathology and visual acuity at the same time as freedom of movement and breadth of vision, as well as protect your he alth for many years.
