In the previous article, we discussed “What does gradient mean in sunglasses?”. In this article, let’s talk about “What are the benefits of gradient sunglasses?”.
Gradient lens is a lens specially designed for people with presbyopia. Starting from the far-use zone of the lens, through the gradual zone to the near-use zone, the refractive power gradually changes. Why use a gradient lens?
Advantages of gradient lens
1. Improve appearance.
Other multifocal lenses have obvious demarcation lines on the lens surface or detectable areas of different refractive power. For example, people with presbyopia tend to be disgusted with the appearance of double-lens, because double-lens is a sign of aging, and progressive lens has an ideal appearance like single-lens.
2. Complete working distance range.
The design of the two refractive powers of the bifocals limits the working distance of the wearer. For highly presbyopic people who wear bifocals, they will lose mid-range vision. Although trifocal lenses can compensate for the correction of mid-range vision, they cannot provide the full range of vision like progressive lenses.(https://www.koalaeye.com/collections/polarized-sunglasses)
3. There is no jump phenomenon.
Unlike other multifocal lenses, the progressive lens does not produce a jump phenomenon. The degree of the gradient lens is gradual rather than abrupt, so it does not cause the prism effect.
4. Convenience.
Gradient lenses are obviously more convenient for wearers who need different corrections for the far and near because the wearers do not need to change glasses.
The benefits of gradient lenses for wearers
The appearance of the lens is like a single vision lens, and there is no dividing line on the lens.
Comfortable middle-distance vision. Gradient lenses are corrective lenses that provide clear and comfortable middle-distance vision under any additional degree of near use. The gradual change of refractive power has designed a specific vision area for middle-distance vision correction.
A continuous clear vision. The progressive lens provides continuous clear vision from far to near. The single vision reading lens only provides a clear vision of the near area, while the sudden refractive power change of the dual vision lens completely separates the distance and near vision.
More natural eye adjustment. For single-lens reading glasses, eye adjustment only supports near vision. For bifocal lenses, when the eye passes through the dividing line from far use to near use, the accommodation changes suddenly. For each point of the meridian of the progressive lens, the refractive power is exactly in line with the focusing distance of the eye. When the line of sight is changed, the eye adjustment does not need to change. The adjustment needs are basically the same as the state before the occurrence of presbyopia.
Continuous spatial perception. The progressive lens provides overall spatial perception, and the refractive power is continuously gradual in all directions. The single vision reading lens only provides near vision correction but does not provide true spatial perception. The two separate parts of the bifocal lens change the spatial relationship, and the resulting image jump also affects the vision and comfort of the wearer.
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