lenses for myopic progression
The management of myopia progression has now become a standard practice for vision professionals.
The main goal is to reduce the incidence of high myopia, as the risk of developing numerous ocular diseases is directly related to the severity of the refractive error. Over the last few decades, many theories have been proposed on how to control the process of emmetropization, and finally, a widely accepted model has emerged within the scientific community: the theory of peripheral defocus. Essentially, the peripheral retina can control the elongation of the eyeball based on the optical signal it receives. The heuristic model of emmetropization proposed by the International Myopia Institute (IMI) in New York summarizes this theory and explains why introducing a peripheral defocus helps control myopia progression. In the most widely accepted model, in fact, a peripheral retinal image variation triggers a biological signal that, in turn, acts on the axial length of the eyeball and consequently on the refractive status.
The lens is characterized by three optical zones:
MYOGA is the lens developed by the R&D Center of DAI Optical to manage myopia progression by introducing positive peripheral defocus. The defocus gradually increases from the center to the periphery of the lens in a symmetrical way, reaching a maximum value of +2.50 D at a distance of 17.5 mm from the geometric center of the lens. In this power map, optimized to minimize astigmatic aberrations induced by power variations, three optical zones can be distinguished. At the centre, there is a correction zone that measures 9 mm in width and ensures clear and sharp vision. Just outside this zone, the defocus gradually increases up to 17.5 mm radius, where it reaches its maximum value. This is the transition zone. While, in the periphery of the lens the defocus remains constant so as not to alter the coordination of eye movements. Thus, MYOGA provides sharp and comfortable vision while simultaneously controlling the optical signal in the periphery, unlike traditional lenses for myopia correction.
“Ai sensi delle Linee guida del Ministero della Salute del 28/03/2013, relative alla pubblicità sanitaria concernente i dispositivi medici si avvisa l’utente che le informazioni ivi contenute sono esclusivamente rivolte agli operatori professionali.”
