Toric lenses: what they are, differences from conventional lenses, types and features

When a person has astigmatism, his vision becomes blurred due to the irregular shape of the cornea of the eye. For such cases, there are special lenses called toric lenses. They correct the vision. Let's consider the features of toric lenses, what are their peculiarities.

What are toric lenses

Toric lenses are contact lenses specially designed for people with astigmatism. Unlike ordinary lenses, which have the same curvature over the entire surface, toric lenses with varying optical power in different directions.

Toric lenses differ from standard spherical lenses in that they can correct distortions caused by astigmatism. Conventional lenses help if a person can't see well at near or far distances, but they can't deal with astigmatism.

Toric lenses must fit precisely on the eye to correct vision properly. To keep them from moving, they have a special design:

• Weighting on the bottom of the lens.
• A special design that holds the lens in position.

Toric lenses are made of materials such as:

• Hydrogel is a soft and moisture-resistant material that contains water. This material makes the lenses soft and comfortable to the eyes. Hydrogel lenses are suitable for those who do not wear them for very long during the day.
• Silicone hydrogel is a newer material that contains silicone in addition to water. Silicone makes the lenses more breathable, meaning that oxygen flows through them better. This is especially important if the lenses need to be worn all day.
• Gas permeable polymers are the materials used to make rigid toric lenses. They do not contain water, but they are excellent at allowing oxygen to pass through. Rigid lenses may be more comfortable for some people with astigmatism because they provide clearer vision.

Each of these materials has its own advantages and disadvantages. The choice depends on how long a person plans to wear the lenses, how sensitive their eyes are, and how much oxygen their eyes require. Therefore, before choosing toric lenses, one should consult with an eye doctor who can help choose the right lenses.

Types of toric lenses

The main types of toric lenses are:

• Soft toric lenses are elastic and flexible, and most people choose them for everyday use. They are well suited for mild to moderate levels of astigmatism.
• Rigid gas permeable lenses are harder and smaller than soft lenses. Hard lenses hold their shape better, so they create clearer vision for difficult astigmatism.
• Daily toric lenses are designed for single use. They are placed in the morning and removed in the evening, after which they are discarded. They are convenient because they do not require maintenance.
• Long-wearing lenses can be kept on for several days and nights. But such lenses require special care and regular consultations with a doctor.
• Scheduled replacement lenses are changed every two weeks or once a month. They are good because there is less risk of deposits accumulating on them, which means there is less chance of irritation or infection.

Toric lenses are a good solution for people with astigmatism who want to see the world clearly and without distortion. It is important to fit them correctly and care for them regularly.