How do Varilux lenses reduce vertical head and eye movement?
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A Non-Presbyope To reach the bottom of the page, the non-presbyope does not have to move his head but simply lower his eyes 20º. With the head raised and the eyes already lowered 30º to reach the top portion of the page, the wearer of a non-Varilux progressive cannot produce the additional 20º lowering of the eyes that is necessary to read the bottom of the page. |
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With Non-Varilux Progressive lenses To achieve the required additional 20º, the wearer lowers his eyes another 10º and the head another 10º. Reading with non-Varilux progressive lenses requires significantly more vertical head movement. |
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With Varilux To achieve the same additional 20º required to read the bottom of the page, the Varilux wearer is able to lower his eyes 15º and is required to produce only 5º vertical head movement, half of the head movement required for non-Varilux progressives. Therefore, reading with Varilux lenses is much more comfortable since head posture and eye movements are more natural. |
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