The swim effect of progressive lenses is mainly due to head movements, while, at the other end of the spectrum, the more a wearer moves his eyes, the greater the lens area the eyes explore. So in order to optimize a progressive lens, it is essential to know the patients unique vision strategy. All Varilux® lenses are based on the wearer’s physiological needs. The designs of the first five generations of Varilux® lenses have been constantly improved based on the common fundamental needs of large populations of presbyopes. Today, Varilux® Ipseo® lenses consider the individual physiological differences of each and every lens wearer. Advanced research demonstrates that eye and head movement ratio have a direct correlation with the way the surface of the lens is used and how objects are perceived :
With eye-movers, the eyes scans a large surface of the lens to explore the surroundings. The more eye movement, the more critical it becomes to maximize the width of vision fields for optimum comfort in dynamic vision. With head-movers, the eyes use only the central portion of the lens for foveal vision. The more head movement, the more critical it becomes to minimize minor distortions for optimum comfort in dynamic vision. The design must be very soft in periphery to minimize the 'swim' effect. Top
Varilux® Ipseo®’s main technological breakthrough means that each and every wearer can benefit from a unique optical solution, designed from his/her unique physiological needs and as a function of his/her unique natural visual behavior. Compensation for all kinds of wearer conditions requires more than minor adjustments, and it’s more than choosing from a variety of designs. Every Varilux® Ipseo® lens is created from the individual wearer’s “visual fingerprint.” Each Varilux® Ipseo® lens is individually conceived and manufactured by using state-of-the-art freeform technology. Freeform is the only technology that allows the manufacturing of unique lenses without the constraint of having pre-manufacturing molds, and also pre-defined designs. Essilor patents in this field (designs creation, freeform, and control) make it possible to create a very accurate personalization for each wearer. Freeform technology generates a complex design directly from a “hockey puck” without using traditional tools and pads. Customization is a design optimization which, by adding parameters to the current Rx, allows lenses to be tailor-made to specific patient needs.
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