Myopia above 600 degrees, the height of the number of reasons for choosing aspherical lenses

Myopia above 600 degrees, the height of the number of reasons for choosing aspherical lenses

The eyewear industry's growing trend towards higher-priced lenses has led lens manufacturers to develop and supply a wide range of monofocal and multifocal lenses made with aspherical lenses. Aspherical lenses have a long history of prescribing high-magnification corrective lenses for patients after cataract surgery. With the adoption of computer-aided design and computer-controlled surface polishing equipment, it is now possible to produce mirrors of almost any complexity. Compared to conventional spherical lenses, aspherical lenses have a more complex surface shape on the front, with curves that curve from the center of the lens to the edge of the lens. In the case of doubled aspherical lenses, the surface of the front of the lens gradually flattens towards the edge of the lens; In the case of a reduced aspheric surface, the surface becomes progressively steeper towards the edge of the lens. This gradually changing surface has a number of important advantages. The most important of these advantages is its aesthetics and excellent optical properties. The advantages of aspherical lenses for those with a high prescription are more obvious than those with a shallow prescription, which is why the optician believes that because its advantages are only obvious in the person with a deep prescription of vision correction, this kind of higher-cost lens is logically more suitable for deep correction of vision. For this reason, many opticians generally only use this type of lens for orthodontics with a curvature of more than +/- 300 curvature, because the aesthetics of aspherical lenses are best highlighted in this case, and the advantages are very contrasting with ordinary spherical lenses with a well-defined curvature. In contrast, the front of a reduced lens is already straight, so the aesthetics of aspherical lenses must be highlighted, especially at lower prescription levels. In fact, the most prominent 'buying point' of the reduced aspherical lens is its superior optical properties 鈥?optical comfort for better visual clarity. Aspherical lenses are designed to reduce or eliminate the pesky astigmatism, the distortion of vision as it moves away from the center of light, which is the Achilles' heel of spherical lenses, which is overcome by changing the curved surface of the front of the aspherical lens, so that the eye moves away from the center of the lens while the object is still very clear. Not only can patients who need to double or reduce their vision correction avoid benefiting from aspherical lenses, but presbyopia patients are also a large beneficiary group. They enjoy the same aesthetic effects as monofocal aspherical lens wearers. The ultra-thin and ultra-light nature of aspherical lenses increases the comfort of wearing glasses, which is especially important for older patients with presbyopia, as their skin elasticity is different from that of younger people. If the glasses are too heavy, the nose pads will sink into the skin, especially after wearing the glasses for a long time. Lightweight glasses are a 'refreshing look'. It has also been found that many orthodontics who already use aspherical bifocal and trifocal lenses require significantly shorter adaptation when switching to progressive multifocal lenses. Accuracy in the preparation of eyewear is of paramount importance, as this is the only way to ensure that customers are satisfied with the products of the eye shop. Compared to traditional glasses, aspherical glasses are probably more skilled in dispensing glasses. The latter immediately perceives that the desire to correct mistakes is very costly. The optometry device must be placed precisely at the height of the distance of the pupil. If the measurement of aspherical lenses is not accurate, it will not only produce a nasty spindle effect, but also the vision of the corrector will not be fully corrected. The panoramic inclination of the lenses is another variable that can have a significant impact on the effect of aspherical lenses. The optical center of the lens should be lowered by 1 mm every 2 degrees of inclination. Most modern frames have an inclination of 8 to 12 mm. The choice of frame is also very important, especially for doubled aspherical lenses, where the thickness of the lens edge is the most critical. In general, the smaller the frame, the thinner the edges of the doubling aspherical lenses are made.