Toric lenses are usually prescribed to individuals who suffer from astigmatism. Astigmatism is a refractive error in which the light rays that enter the eye don’t fall onto a single focal point. In astigmatism, the power of one is different to that of the other in one direction. The shapes of the eyes vary as well. While eyes are usually shaped round, eyes which suffer fr4om astigmatism are shaped oblong, similar to a football.
People that suffer from astigmatism can’t usually wear conventional lenses and need to opt for a toric lens instead to correct their vision. Initially, lens options for these individuals were very limited. As opposed to traditional lenses, a toric usually has two powers. This means that the lens itself should remain in one position for optimal clarity. This problem is curtailed by making sure that the lens is heavier and doesn’t rotate or move too much. Too much movement can have a negative effect on the vision.
Who are they for?
Anyone who suffers from corneal or lenticular astigmatism can need a toric contact lens. The kind of lens that will best suit you depends on the make-up of the eye itself. Some patients may continue to experience discomfort even after they begin using a toric. The perfect toric can be determined by the optician who will make the decision based on the vision quality, needs and the kind of astigmatism that the patient is suffer from.
What are they made of?
You can either get a rigid gas permeable lens or a soft contact lens. These are available in a variety of designs and materials. A rigid gas permeable lens is made of a material with increased stiffness that allows it to retain its shape whenever you blink. It is also available in bifocal and multifocal option. These are known as bitoric (back toric), prism ballast lenses and front torics. These are made from permeable materials which do not obstruct the flow of oxygen into the eye. Since they are made in order to correct astigmatism, they are of a more rigid nature. This does not mean however that they are unbreakable. They are prone to tears and can break if not cared for. They allow for flexibility by using silicone to reduce the discomfort. The lens however still requires the wearer to adapt to its shape. Individuals that choose to make use of conventional soft contact lenses instead of RGP torics due to various reasons such s comfort or economy end up compromising when it comes to vision clarity.
Issues with Torics
Many patients often reject toric lenses. This is because of the discomfort that they feel when they are worn. Although these lenses are well equipped to correct astigmatism, they can be difficult to wear over large periods of time, especially due to their rigidity and immobility. Conventional lenses are usually not felt within the eye. Since the torics are a little stiff, the wearer is constantly aware of their presence due to the amount of pressure that it exerts onto the lower lid of the eye.
If you choose to opt for a toric lens, make sure you have though discussion with your doctor to determine your needs and options.