Individuals with astigmatism can wear contact lenses successfully. Astigmatism is a common vision condition caused by an irregularly shaped cornea or lens, which prevents light from focusing correctly on the retina. Once challenging, astigmatism is now widely manageable with specialized contact lenses due to advancements in lens technology.
How Toric Lenses Work
Contact lenses designed to correct astigmatism are known as toric lenses. Unlike standard spherical lenses, toric lenses feature different optical powers in different meridians. This unique design accounts for the varied curvature of an astigmatic eye, ensuring light bends precisely to form a clear image on the retina.
For toric lenses to provide clear vision, they must maintain a specific orientation on the eye. Manufacturers incorporate stabilization mechanisms into the lens design to prevent rotation. Common methods include prism ballast, which uses a slightly thicker bottom for gravity-based stability, or thin zones, which interact with eyelids during blinking. Some designs also use truncation, where a small part of the lens is flattened to help it settle correctly on the lower eyelid.
The Contact Lens Fitting Process
Obtaining contact lenses for astigmatism begins with a comprehensive eye examination by an eye care professional. This examination includes specific measurements that map the unique shape of the cornea. Technologies like keratometry measure the central cornea’s curvature, while corneal topography provides a detailed, three-dimensional map of the entire corneal surface.
These precise measurements are used to select trial lenses that closely match the eye’s astigmatic profile. The eye care professional observes how the trial lens settles and moves, ensuring proper alignment and stability. Several trial lenses may be necessary to find the optimal fit, which is important for consistent vision correction. Follow-up appointments assess comfort, vision clarity, and eye health after a period of wear, allowing for necessary adjustments to the lens prescription or type.
Living with Astigmatism Contact Lenses
Many options are available for individuals wearing astigmatism contact lenses, primarily soft toric lenses. These come in various replacement schedules, including daily disposables, bi-weekly, and monthly options, providing flexibility based on lifestyle and preferences. Each type requires adherence to specific cleaning and storage routines, especially for reusable lenses, to maintain eye health and lens performance.
For some individuals with more complex or severe astigmatism, rigid gas permeable (RGP) lenses may be considered. These lenses offer highly customized correction and provide sharper vision due to their durable material and ability to hold their shape precisely on the eye. Proper lens care and hygiene are essential for all contact lens wearers to prevent complications like infections or discomfort. If vision becomes blurry or discomfort arises, consult an eye care professional promptly.