Technologies Behind Autograph Lenses
Shamir is known worldwide for its superior spectacle lens technology. Here’s a brief review of just three of those proprietary technologies that are applied to the design of all Shamir Autograph lenses…the Shamir Close-Up™ and As-Worn™ technologies and the Natural Posture™ design concept.
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Shamir’s Close–Up technology adjusts the reading zone inset of every lens to the individual patient’s convergence during near viewing. Put another way, the lens is custom-adjusted to each individual’s near PD, relative to their far PD.
The amount of convergence required and achieved influences near visual performance during close work tasks. Today’s lens designs are “universally optimized” for near viewing, with an average inset value, which is fine in most cases. However, when it comes to any irregularities, near vision may be unfocused or narrow.
With the Close-Up technology, adjustments are made in 0.1 mm steps within a range of 0-5 mm. This advanced lens design technology creates lenses that meet individual differences—from distance between pupils, reading distance, or asymmetric convergence, to lifestyle, type of work, hobbies, etc. The result is increased patient comfort, both ergonomically and visually.
Natural Posture ensures a comfortable ergonomic posture while reading, just as Close-Up™ enables a more natural convergence of the eyes for close tasks. A physiological trait that varies from person to person, convergence is particularly significant when it comes to progressive lenses.
The problem? The natural position of holding reading material is at a distance of 16 inches (40 cm), with a viewing angle of about 30º. With the introduction of prescription lenses, the near viewing zone does not correspond to this angle. Therefore, the patient compensates by tilting their head forward or backward, or by raising or lowering the reading material. This ultimately leads to an uncomfortable and unnatural posture.
The near viewing zone is dynamically located within the lens corridor, taking into account the Rx sphere value–plus or minus. This reduces the need to tilt the head forward or backward or alternatively to lower or raise a book when reading to find the right viewing distance and angle. Any discomfort within the individual’s posture is thereby minimized, and patients are ensured a comfortable, natural posture during near viewing.
As-Worn Technology™ provides perfect vision for any frame choice.
In order to provide patients with a lens that is fully personalized to them, it is important to understand that:
• their frame will have some panoramic angle
• their lenses will be tilted due to the frame or how they wear their frame
• and the lens may be closer or further away from the patient’s eye than that measured in the phoropter.
With As-Worn Technology™, Shamir uses three different measurements to fine-tune the lens like never before in order to create a lens that’s best-suited for the patient and the frame they have selected. Those measurements are:
• vertex distance
• pantoscopic tilt
• and panoramic angle
The result is increased comfort and unsurpassed patient satisfaction.
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