What do you know about high-index lenses? Maybe you only know that they are the best choice for those who have a strong prescription, actually, it has another name, asperic lenses, which are a subclass of aspheric lens, typically the design focuses on reducing the error across the horizontal and vertical lens axis edges, designs refering to flatter curves are trading off optical quality for cosmetic appearance. This kind of eyeglasses lenses can be primarily beneficial to farsighted individuals, whose lenses have a thick center. But the price is much more expensive than ordinary lenses.