Electronic versus manual measurements

// ELECTRONIC VERSUS MANUAL MEASUREMENTS

Unlike taking manual measurements, with ACTIVISU®, electronic measurements are taken on a frame worn by the patient which has a significant impact on the half-pupillary distances. It also takes into account the patient’s natural posture thanks to the patented H3D technology. Consideration of the head cape should not be minimised as it has a direct impact on the half-pupillary distances. Taking electronic measurements also helps to avoid parallax errors in fitting heights, often due to the fact that the optician is not placed at the same height as the patient.

The repeatability of measurements depends on several factors.

The frame should not change position and should fit snugly on the patient’s face. It is best to remove presentation lenses when possible.

The clip should be properly positioned with the notch aligned with the center of the frame bridge.

Clip markers should be correctly detected. It is these, in part, that allow the 3D reconstruction of the eye-lens-frame structure.

The client should keep their eyes open so that corneal reflections are easily detectable.

The repeatability of the posture facing the mirror:
• 1 degree of head tape has an incidence of 0.4 mm on the half-pupillary distances.
• 1 degree of pantoscopic angle has an impact of 0.5 mm on fitting heights.

Boxing must be done with care: the tangents must be placed on the inner edge of the front face of the frame, without taking the grooves into account.

The modification of the patient’s posture between two measurements is the first source of difference between several measurements on the same wearer with the same frame. Thanks to numerous robust and repeatability tests, ACTIVISU® electronic measurements solutions allow a result precise to the nearest 10th of a millimeter and degree.

In addition, let us remember that the imperatives of physical distancing are fully respected thanks to the use of electronic measurements solutions.

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Electronic versus manual measurements

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