By contrast, the VoMD creates a spread of non-focused light rather than the single focus power of an 'add'. Indeed, when we think of an 'add' power in a myopia controlling spectacle or contact lens, this is an accurate way to represent the 'treatment' component of that lens design. We imagine these as focal points, or single planes of focus. 6 Whether pictured in your mind as off-axis or on-axis effects, the common theme is creating two contrasting signals: one which falls on the retina to correct ametropia, and one which falls in front of the retina (myopic defocus) to provide the slow-down signal. The concept of relative myopic defocus as a slow-down signal for eye growth is not new, having been demonstrated in animal models as both 'peripheral defocus' 5 and 'simultaneous defocus'. The Essilor® Stellest™ spectacle lens takes the concept of myopic defocus to a new level by introducing the concept of a 'volume of myopic defocus' (VoMD). Research on visual functions has also been undertaken indicating that the lens design has minimal impact on distance and near acuity, contrast vision and binocular vision compared to single vision spectacle lens wear. In this article we'll explore the details of this innovative new spectacle lens for myopia control, including research data on its efficacy and visual outcomes. The Essilor Stellest lens is designed with Highly Aspherical Lenslet Target ("H.A.L.T.") Technology. 2,3 In children who wore Stellest lenses for at least 12 hours per day, 7 days per week, their final axial length and myopia was respectively 0.41mm and 0.99D less than children who wore single vision spectacles. 1īoth one-year and two-year randomized control trial data have been published. Hi-index lenses can reduce the edge of thickness or the bulbous appearance of higher prescriptions.Essilor® Stellest™ lens is one of the newest generation of myopia controlling spectacle lenses, appearing to have efficacy to slow myopia progression in children at least as good as the current 'best' interventions of orthokeratology, dual-focus soft contact lenses and 0.05% atropine. This is one that is made of a denser material so the lens does not have to be as thick to get the same prescription. The appearance of your spectacles can be greatly enhanced by choosing a hi-index lens. There are different grades of varifocal lens – and we will discuss with you which suits your visual requirements. In a varifocal lens the surface is continuous – to look at the lens there is no obvious change of prescription – to look through the lens the prescription changes from distance to reading through a transition zone set in line with your pupils. A bifocal lens has two discrete areas: the top half of the lends is for distance vision while the lower segment is for reading. The other two types of lenses are bifocal and varifocal. Our frames are priced including lenses but if you are using your own frame then single vision lenses start at £25 (a glazing charge may apply). Single vision lenses correct your vision at all distances and are most commonly used by those under the age of 40. The simplest form of spectacle lens you can get is single vision. A little bit of time spent on discussing these options can make a big difference to how your spectacles look and feel. Spectacle Lenses The Optical Factor prides itself on the expert advice we give on lenses for your frame and prescription.
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