VisionPlus India

as well as peripheral and dynamic vision however occurred in 1972 with the introduction of Varilux 2, for which Maitenaz created a totally aspheric design and manufacturing process. Carl Zeiss AG developed freeform technology in 1983 and then launched their own patented progressive series Gradal HS in 1993. Early progressive lenses were relatively crude designs. Right and left were identical variable power lenses with distance and reading power centers in the upper and lower part of the lens, respectively. The glazing was made to accommodate eye position changes from distance While there were several intermediate steps (H. Newbold appears to have designed a similar lens to Aves around 1913), there is evidence to suggest that Duke Elder in 1922 developed the world's first commercially available PAL (Ultrifo) sold by "Gowlland of Montreal". This was based on an arrangement of aspherical surfaces. The Carl Zeiss AG & Varilux lenses were the first PAL of modern design. Bernard Maitenaz patented Varilux in 1953, and the product was introduced in 1959 by Société des Lunetiers (now Essilor). The first Varilux lenses' surface structure was however still close to a bifocal lens, with an upper, aberration-free half of the surface for far vision and a rather large "segment" for clear near vision. The breakthrough in user adaptation and comfort, THE IDEA BEHIND THE POWER PROGRESSION IN ONE SINGLE LENS WITHOUT THE DIVIDING LINE SEEN DATES BACK TO 114 YEARS AGO! 47 VISION PLUS INDIA EDITION