VARILUX S 4D
VARILUX® S 4D FEATURES
Backed by Nanoptix, SynchronEyes and the ground-breaking 4D Technology, Varilux S 4D lenses are a revolution in lens personalization.
In addition to position of wear, natural head posture and eye rotation center, Varilux S 4D lenses also include the leading, dominant eye measurement that allows patients to experience faster visual reaction time.
Varilux S 4D lenses are exclusive to Visioffice® / Eyepartner eye care professionals.
Until now binocular vision has not been taken completely into consideration in any progressive lens. And yet respecting the various aspects of binocular vision, whatever the prescriptions for both eyes,
is necessary for optimal visual perception. Further, the dominant eye plays a highly specific role in the ocular pair. Taking this parameter into account enables us to improve the wearer’s binocular visual performance still further. For the very first time 4D TechnologyTM enables these various parameters to be taken into account in the calculation of progressive lenses.
Cyclopean eye and binocular visual direction
Like the Cyclops in Greek mythology, although our two eyes each receive and analyse an image of the surrounding world, in binocular vision we see a single image from a virtual point of view known as the Cyclopean eye.
Hering’s demonstration is a good illustration of this phenomenon (fig. 3). A person looks through a hole pierced through a glass panel such that the house is seen only by the right eye and the tree by the left eye. When the two eyes are opened the house and the tree appear to be superimposed in the same egocentric direction coming from a point located approximately in the median plane of the head . This reference point, known as the Cyclopean eye, is where the binocular visual direction originates. This is a well known concept in the analysis of binocular vision.
Fig. 4: Experiment with the Essilor R&D Virtual Reality Simulator – The subject had to indicate, using a joypad, the successive directions of Snellen’s E (4 directions possible) displayed for 1500ms at different positions in the binocular field of vision.
Between each display of E, the subject had to stare at a central cross placed in the primary direction of the eyes. An additional optical defect was placed alternately on the dominant eye or on the other eye. For each of the targets displayed the response time (joypad response – target display t) was recorded.
There are numerous tests to define the dominant eye. Porac and Coren distinguish two types of tests: those for which monocular aiming is conscious and those for which it is unconscious. The authors’ preference is for the second type of tests. This is the case of the “Hole in the Card Test” where the subject has to stare, with both eyes open, through a perforated card at a target facing him.
A protocol as well as a specific mechanism have been developed and integrated into the Visioffice in order to enable opticians to make this measurement in their shops (fig. 5). The customer holds the tablet in both hands and looks at the Visioffice fixing target through the tablet viewer. The new software integrated into Visioffice automatically identifies the person’s dominant eye. Thus, using the new
4D tablet, an optician can quickly identify his customer’s dominant eye.
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VARILUX S 4D VARILUX® S 4D FEATURES
Backed by Nanoptix, SynchronEyes and the ground-breaking 4D Technology, Varilux S 4D lenses are a revolution in lens personalization.
In addition to position of wear, natural head posture and eye rotation center, Varilux S 4D lenses also include the leading, dominant eye measurement that allows patients to experience faster visual reaction time.
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