Biofinity Toric lenses are designed keeping in mind two ideals wanted in a contact lens: comfort and stability. These lenses will not only provide the patient with a comfortable lens which may be worn continuously for 7 days at a time, but also crisp, clear vision without the hassle of switching from contacts to glasses at the end of the day. The design is liberating allowing the patient the vision they have always wanted from their toric lenses. Utilizing optimized lens geometry and Aquaform Technology™, these lenses have set a benchmark for quality toric designs across the industry.
Beyond comfort, the most important aspect of toric lens designs is its ability to stay put. The lens needs to remain stable throughout the day to provide the highest level of visual acuity possible. Unlike spherical lenses, toric lenses are corrected in two different axes. The “x-axis” (saggital value) runs the length of the horizontal plane of the lens and corrects the patient’s nearsightedness/farsightedness. The “y-axis” (tangential value) runs the length of the vertical plane of the lens and corrects the degree of astigmatism suffered by the patient. These corrections are oriented at right angles to one another allowing light to be directly focused at a single point of the retina. If a toric contact lens is allowed to shift either through blinking or rubbing of the eye, the patient will be deprived of clear vision as the lens finds its way back to its proper orientation. This is known as its rotational recovery period. The optimized lens geometry of the Biofinity Toric lenses is multifaceted meaning they have what is known as wide ballast band which helps to orient the lens quickly if it moves out of place. This design also allows a larger optic zone which allows for a wider field of view for the patient in addition to a smooth surface which provides the wearer with comfort throughout continuous wear.
Maintaining the corneal tear film when wearing contacts helps to maximize the comfort and ability of the cornea to remain healthy. The natural production of tears provides nutrients, lubrication and protection to the cornea. This process of lacrimation (tear production) can diminish as contacts are worn. Biofinity has addressed this problem through the Aquaform Technology™ design feature which helps to maintain the fluid environment necessary for the eye to remain healthy. This design employs a myriad of technologies including material that allows the eye to breath better, more flexibility of the lens (also called a low modulus), and silicone macromers which improve the uniform wettability of the lens. Silicone macromers are actually part of the lens material itself unlike other lens designs which have coatings which tend to dissipate over time. The Aquaform Technology allows water to hydrate the lens and maintain fluidity on the surface which allows the cornea to remain healthy as well as the contact to remain comfortable. Additionally, the contact angle between the edge of the contact and the cornea is designed to allow the edge of the lenses to remain comfortable through several days of wear.