Centering and mounting CHOICE OF EYEGLASS FRAME For full use of visual fields for far and near, it is important to choose a frame that has a height appropriate to the corridor length of progression and has a minimum distance between the pupillary center and the top edge of the frame, in order to fully utilize this distant vision area. DISTANCE BETWEEN PUPILS It is suggested to use an interpupillometer that use the corneal reflex calibrated to infinity and consider the two half-distances. For the detection of pupillary centers for far distances, you must place it in front of the wearer with his line of sight at the same height and indicate on the presentation filters the height from the pupillary holes at the edge of the frame. METHOD OF MOUNTING Progressive lenses should be centered by placing the assembly cross, marked on the outer surface, in correspondence to the pupil center fixed in the infinite vision (not higher, not lower). After assembling is completed , before to eliminate the tracking with alcohol or acetone (depending on the type of material), it should be checked the correct position of the reference cross on the pupil of the wearer.
For a correct assembly of aspherical lens, the optical center should be positioned with the pantoscopic angle reduced to zero (make the patient raise his head until the front side of the frame is perpendicular to the floor) with respect to the horizontal axis view on the half-distance. On aspherical lenses is not possible to decentralize on mm, but only on prismatic diopters (to be requested when ordering). P.S. When a pre-calibrated processing with aspherical lenses is requested, one must consider the necessary lowering of the optical center before making the outline of the shape on the form.
(optical center of near vision) If you look through the segment of a bifocal lens, the visual axis passes, however, through a peripheral portion (eccentric) of the lens for distance and then undergoes a "prism effect" (decentralization ). This effect then causes a shift of the optical center of the segment, according to the power for far, that can be placed even outside of the segment itself. In toric lenses, the cylinder and its axis affect the values of displacement.
|Montaggio Poly Cerchiato|
|Montaggio Fasciante/Cello/Metallo B6/B8|
|Montaggio Air Titanium/Parad'eyes/Rim|
|Montaggio Lente Prismatica|
|Incollaggio Lenti Maschera da Sub|
|Cambio Forma Nylor/Glasant|
|Supplemento Montaggio Lenti fornite dal Cliente|