Bifocal contact lenses are a solution for people who require vision correction for both near and distance vision. These lenses are especially beneficial for individuals experiencing presbyopia, a condition that commonly develops with age. For those with astigmatism, which is characterized by an irregular curvature of the cornea or lens leading to blurred vision, finding appropriate bifocal options can be challenging. This blog discusses the availability of bifocal contact lenses for astigmatism and their features.
Understanding Astigmatism
Astigmatism is a common refractive error that affects how light enters the eye. In a normal eye, the cornea has a smooth and even curvature, allowing light to focus directly on the retina for clear vision. In the case of astigmatism, the cornea or lens may be shaped more like a football, causing light to focus on multiple points rather than a single one. This results in blurred or distorted vision at all distances.
Astigmatism can coexist with other refractive errors, such as myopia (nearsightedness) or hyperopia (farsightedness). Many individuals with astigmatism may also develop presbyopia as they age, leading to the need for bifocal or multifocal vision correction.
What Are Bifocal Contact Lenses?
Bifocal contact lenses are designed to provide both distance and near vision correction within the same lens. These lenses typically have two distinct optical zones: the upper portion for distance vision and the lower portion for near vision. Bifocal contact lenses can assist individuals who have difficulty focusing on close-up tasks, such as reading, while still allowing for clear distance vision.
There are various designs of bifocal lenses available, including simultaneous vision designs, where both zones are visible at all times, and segmented designs, which have a clear separation between different vision correction areas. The choice of design often depends on individual preferences and visual needs.
Bifocal Contact Lenses for Astigmatism
For individuals with astigmatism who also require bifocal correction, there are specific options available. Manufacturers have developed toric bifocal contact lenses that combine the features of both toric lenses for astigmatism and bifocal lenses for presbyopia.
Toric lenses are designed to correct astigmatism by having different prescription powers in various meridians of the lens. When combined with bifocal features, these lenses help to correct both the irregular curvature of the eye and the near vision deficit that accompanies aging.
These toric bifocal lenses are available in both soft and rigid gas-permeable (GP) material. Soft toric bifocal lenses tend to be the most popular choice due to their comfort and ease of use. GP lenses, while less common for this purpose, offer additional oxygen permeability and can provide crisp vision for some wearers.
Fitting and Consultation
It is essential for individuals with astigmatism seeking bifocal contact lenses to consult with an eye care professional. A comprehensive eye examination can determine the appropriate prescription and assess the level of astigmatism and presbyopia. During the fitting process, optometrists will consider various factors such as the patient’s lifestyle, visual demands, and comfort level with contact lenses.
The fitting of toric bifocal lenses can be more complex than standard contact lenses due to the need for precise alignment. The lenses must remain stable on the eye to provide the intended vision correction. Eye care providers may use fitting sets to help find the most suitable lens type and design for the individual.
Benefits of Bifocal Contact Lenses for Astigmatism
Toric bifocal contact lenses offer several benefits for individuals with astigmatism. These lenses provide a convenient option for those who want to avoid the hassle of switching between different eyewear for distance and near activities. Being able to wear contact lenses can also enhance peripheral vision and reduce distortions that may be present with bifocal glasses.
Wearing bifocal contacts can improve the overall quality of vision, allowing individuals to engage in daily activities such as reading, crafting, or using electronic devices without discomfort or visual strain. Additionally, these lenses provide a more natural field of view compared to traditional bifocal glasses.
Potential Considerations
While bifocal contact lenses for astigmatism can provide significant benefits, they may not be suitable for everyone. Some individuals may prefer the clarity offered by glasses or may find contact lenses uncomfortable. Additionally, adapting to bifocal contact lenses can take time, especially for individuals who have never worn contacts before.
Regular follow-up visits with an eye care professional are vital to monitor fit, comfort, and vision quality. Adjustments may be necessary to ensure optimal performance and to address any issues that may arise during the adaptation phase.