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I often see ads in sunglasses: "Turn base 8" "Curve 10 base x 4.5" "Toric Lens".?What does this mean??What is the base curve??What this impacts on the lens??A sunglasses can be better or worse depending on the base curve?
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Then, the glasses must have the following settings:?a) Curvature of the frame to follow the curvature face horizontally?2) The vertical frame must have an inclination of approximately 12 degrees inclination Pantoscópica call, ie, the lower edges of the frame of the face are closer than the upper?3) When the frame has platelets, these must be adjusted so that they are fully supported on the nasal septum, taking into account the height of the frame relative to the center of the pupil?4) rods must have an opening so that no perfect brows and shake or become loose, causing the feeling that the glasses are large?5) Finally, the probe must be adjusted following the curve behind the ears, with a curve + / - 45, so that the frame be secured to the face, without pressure, so that the glasses do not slip over the nose and increase the distance vertex and taking lens of the optical center of the pupil center.?For multifocal eyeglasses, the pre- adjustments must be very strict.
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