Focus Dailies are soft daily disposable lenses designed to provide optimum comfort as well as prevention of the many of the complications commonly associated with extended contact lens wear. This has made them an ideal choice for the eyecare provider in years past since the design addressed several key issues contributing to complications that made conventional soft planned replacement lenses uncomfortable for the patient or compromised ocular health. These lenses are currently in production, but slated to be replaced by the more advanced and beneficial Dailies AquaComfort Plus™ disposable lenses. Although an older generation of hydrogel lenses, the Focus Dailies still provide all the benefits necessary to consider them as a potential corrective modality for the eyecare professional.
When assessing ocular health as it relates to contact lens wear, three key factors must be considered: oxygen transmissibility, resistance to protein buildup, allergen buildup, corneal neovascularization and resistance to debris and bacteria. Focus Dailies are comprised of a hydrogel polymer, Neflicon A, which provides six times the amount of oxygen than conventional planned replacement lenses. This transmission of oxygen to the corneal surface prevents two problems: irritation and a condition known as corneal neovascularization. When the cornea is deprived of oxygen, the eye attempts to correct the problem by growing new blood vessels to the affected area. Blood vessels carry nutrients and oxygen. In advanced stages of this condition, the new blood vessels may hinder the ability of light to effectively reach the retina; distorting vision and compromising visual acuities. Focus Dailies prevent this from happening not only through the high level of oxygen transmissibility provided during wear, but also by virtue of use. Since these lenses are disposable there is less likelihood conditions will result in a loss of oxygen to the cornea.
Focus Dailies are also resistant to protein buildup. Tears which are responsible for removing debris and hydrating the surface of the cornea also contain two types of proteins: native and denatured. Denatured proteins will often adhere to a lens surface. Over time, if not disinfected properly, these proteins will buildup, warp the surface of the cornea and induce irregular astigmatism resulting in poor vision. Once again, since these lenses are disposable they do not allow for this buildup to occur. The same can be said for allergens and bacteria. Since these lenses are discarded by day’s end, bacteria are not allowed to remain and colonize, nor are allergens allowed to build up and irritate the eye.
A primary factor in maintaining the comfort and health of the cornea is a healthy corneal tear film. In order to accomplish this equilibrium, it is important to supply the tear film with an adequate supply of moisture. Focus Dailies accomplish this task through hydrophilic hydrogel technology allowing the lens to absorb and retain moisture from the patient’s natural tears, contact lens rewetting drops and contact solutions designed to hydrate the lens surface. This system prevents the development of symptoms typically associated with dry eye syndrome thus preserving the integrity of the tear film and the patient’s vision.