Abstract: many opticians generally only choose this lens for correctors with more than + / – 300 degrees of curvature, because in this case, it can best highlight the beauty of aspheric lens, and its advantages are in sharp contrast to ordinary spherical lens with obvious curvature contour., In today’s glasses industry, the pursuit of thin and lightweight lenses is at its peak. Aspherical lens not only meets the needs of fashion trend, but also has excellent optical performance., Compared with the traditional spherical lens, the front surface shape of aspheric lens is more complex, and the curve is curved from the center of the lens to the edge of the lens. For double aspheric lenses, the front surface of the lens gradually flattens towards the edge of the lens; For the magnification reducing aspherical surface, the surface gradually becomes steeper towards the edge of the lens. This gradually changing surface has many important advantages. The most important advantage (and the most successful “buy point”) is its beautiful appearance and excellent optical performance., The advantages of aspherical lens for the corrector with high prescription degree are more obvious than those with shallow prescription. This is because the optician believes that its advantages are clearly reflected only in the corrector with deep prescription degree, so this kind of lens with higher price is more suitable for the corrector with deep prescription degree., Therefore, many opticians generally only choose this kind of lens for correctors with more than + / – 300 degrees of curvature, because in this case, it can best highlight the beauty of aspheric lens, and its advantages are in sharp contrast to ordinary spherical lens with obvious curvature contour. In contrast, the front of the magnification reducing lens is very straight, so the aesthetic effect of the aspheric lens is highlighted, especially when the prescription degree is low., In fact, the most prominent ‘buying point’ of the reduced magnification aspheric lens is its excellent optical characteristics – better visual clarity and optical comfort. The design of aspherical lens can reduce or eliminate the annoying astigmatism, that is, the visual scene will be distorted as it moves away from the light center, which is the fatal weakness of spherical lens. This phenomenon can be overcome by changing the front arc surface of aspherical lens, and the effect that the viewed object is still clear as the eyes move away from the center of lens can be achieved., How to distinguish aspheric lenses?, Method 1: identify with a power meter. Compared with the edge power of spherical lens, the top power of negative film is less than the edge power; The positive top focus is less than or close to the edge degree., Compared with the edge degree of aspheric lens, the higher the spherical lens degree is close to the edge, the lower the spherical lens degree is, and the higher the cylindrical lens degree is close to the edge.,
in today’s glasses industry, the pursuit of thin and lightweight lenses is at its peak. Aspheric lens not only meets the needs of fashion trend, but also has excellent optical performance.
compared with the traditional spherical lens, the front surface shape of aspheric lens is more complex, and the curve is bent from the center of the lens to the edge of the lens. For double aspheric lenses, the front surface of the lens gradually flattens towards the edge of the lens; For the magnification reducing aspherical surface, the surface gradually becomes steeper towards the edge of the lens. This gradually changing surface has many important advantages. The most important advantage (and the most successful “buy point”) is its beautiful appearance and excellent optical performance.
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aspherical lenses show more obvious advantages for correctors with high prescription power than for correctors with shallow prescription power. This is the view of opticians. Precisely because its advantages are clearly reflected only in those with deep corrected vision, this kind of lens with higher cost is more suitable for deep correctors in principle.
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therefore, many opticians generally only choose this kind of lens for correctors with more than + / – 300 degrees of curvature, because in this case, it can most highlight the beauty of aspheric lens, and its advantages are in sharp contrast to ordinary spherical lens with obvious curvature contour. In contrast, the front of the magnification reducing lens is very straight. Therefore, the aesthetic effect of the aspheric lens is prominently reflected, especially when the prescription degree is low.
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in fact, the most prominent “buying point” of reduced magnification aspheric lens is its excellent optical characteristics – better visual clarity and optical comfort. The design of aspherical lens can reduce or eliminate the annoying astigmatism, that is, the visual scene is distorted as it moves away from the light center, which is the fatal weakness of spherical lens. This phenomenon can be overcome by changing the front arc surface of aspherical lens, which can achieve the effect that the viewed object is still clear as the eyes move away from the center of the lens. How can
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distinguish aspheric lenses?
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method 1: identify with a focimeter. Compared with the edge power of spherical lens, the top power of negative film is less than the edge power; The positive vertex power is less than or close to the edge power. Compared with the edge power of
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aspherical lenses, the closer the spherical lens power is to the edge, the lower the spherical lens power is, and the closer the cylindrical lens power is to the edge, the higher the spherical lens power is.
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method 2: identify by using the mirror scale. The curvature of spherical lens surface is the same, while the curvature of aspheric lens surface is also different due to different parts. It is easy to identify through the measurement results of the mirror meter.
method 3: naked eye observation. Compared with aspherical surfaces, aspherical lenses of the same material and degree are smoother, thinner, more realistic, more natural and comfortable.
if you look at the coating shape of the lens against the lamp tube, the lamp tube reflected by the spherical lens is generally straight (except for the high diopter lens); while the shape of the lamp tube of the aspherical lens is more curved due to the different curvature of various parts of the surface.