Due to increasing academic and work pressures, as well as prolonged exposure to electronic devices, more and more people are experiencing vision problems. Some people choose progressive multifocal lenses when getting glasses—so what exactly are these lenses?
Progressive multifocal lenses are lenses where the upper portion is for distance vision and the lower portion is for near vision, with different powers in each section. The transition from the fixed distance prescription at the top of the lens to the fixed near prescription at the bottom is not abrupt; rather, it gradually transitions through a progressive change in refractive power between the two. Compared to ordinary bifocal or trifocal lenses, they offer the following advantages.
Principles of Progressive Multifocal Lenses
Aesthetic Appearance: The lens looks like a single-vision lens, with no visible dividing line showing the power change. Not only is it aesthetically pleasing, but more importantly, it protects the wearer’s age privacy—you don’t have to worry about revealing your age secret just by wearing glasses.
Smooth Adaptation: Because the lens power changes gradually, there is no image jump. They are comfortable to wear and easy to adapt to, making them readily accepted by users.
Reduced Visual Fatigue: Since the power is gradual, the substitution for accommodation increases progressively as the viewing distance shortens, without fluctuations in accommodation, making visual fatigue less likely.
Clear Vision at All Distances: A single pair of glasses simultaneously satisfies distance, near, and all intermediate distance needs. This is especially beneficial for teachers, doctors, musicians, and computer operators—people who not only need to see distant and near objects clearly, but also need to see intermediate-distance objects such as blackboards, sheet music, and computer screens for most of their time. This is something no other lens besides progressive multifocal lenses can achieve.
Myopia Prevention in Youth: Currently endorsed by ophthalmology experts both domestically and internationally: “Adolescents should wear low-power convex lenses when reading and writing to reduce near accommodation, thereby alleviating or preventing the onset and progression of myopia.” This gives progressive multifocal lenses new significance and mission. Physiological studies have found that excessive use of the eye’s accommodative function can lead to “accommodative spasm,” or pseudomyopia. Continued development can result in longitudinal elongation of the eye axis, inducing “true myopia,” or axial myopia.
The external power of progressive lenses can be artificially combined with progressive power—using the deeper power at the top for distance vision and the shallower power at the bottom for near vision, allowing the eyeball to relax from over-accommodation. The continuously changing lens power replaces the “accommodative effort” that would otherwise be required, blocking the vicious cycle of accommodation → eye axis elongation. This makes the eye less prone to fatigue and slows the progression of myopia.
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