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Pantoscopic tilt
The document discusses pantoscopic tilt, which is when the bottom of eyeglass frames are angled toward the cheeks. It describes how proper pantoscopic tilt helps maximize the amount of bridge surface resting on the nose. The document also mentions retroscopic tilt, when the bottom of frames is angled away from the cheeks, and orthoscopic tilt, when frames have no angle. Additionally, it explains how lens tilt improves how glasses look and function for patients, and depends on ear and nose bridge heights, requiring frames to be properly adjusted for individual wearers before measurements.
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Pantoscopic tilt
- 1.
- 13. The 3T-015A isa measuring tools for measuring the Pantoscopic Angle and the Back Vertex Distance, especially for Progressive Lenses.
- 17. Pantoscopic: The lensbottom is rotated towards the cheeks. Retroscopic: The lens bottom is rotated away from the cheeks. Rotation of the lens, around the horizontal axis occurs in frames at the hinge so temples mounted at the top of a frame are rotated like the above illustration
- 18. In addition, properpantoscopic tilt will help maximize the amount of bridge surface resting on the nose. Retroscopic may at times be needed to maximize the amount of bridge surface touching the nose, but generally the purpose of retroscopic is to remove the lower rim of the frame from a protruding cheek. Pantoscopic Tilt - When the bottom of the frames is angled toward the cheeks. Orthoscopic Tilt - When the frames have no angle. Retroscopic Tilt - When the bottom of the frames is angled away from the cheeks.
- 19. Lens tilt improvesthe way a lens works and contributes to how good a pair of glasses looks on the patient. Tilt is dependent on the interaction of the heights of the ears and bridge of the nose. So, even though a new frame has about seven degrees of tilt when manufactured once lenses are added the frame may not appear to have any tilt at all unless it is well adjusted to the wearer before any measurements are taken. So, when taking measurements for free-form or digitally enhanced lenses, place the frame on the patient, make sure the frame front is straight and lenses have about 8 degrees of tilt. The amount of tilt should look good i.e., correct for the way that this patient wears this frame