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Adjustable focus lenses, like single-focus lenses, also reduce image-jump and spatial distortion in the field of view associated with traditional multi-focal lenses. Additionally, the ideal near-vision correction can be achieved with precision, because the variable lenses emulate the focusing action of the youthful (non-presbyopic) eye.
A prescription of −1.00 +0.25 × 180 describes a lens that has a horizontal power of −1.00 D and a vertical power of −0.75 D. Only ophthalmologists write prescriptions in + cylinder. An optometrist would write a prescription in - (minus) cylinder. All spectacle and contact lenses would be made in minus cylinder.
A bifocal lens with areas of differing magnification Bifocals with separate lenses. In this case, the Swedish ethnologist Jan-Öjvind Swahn [ sv ] . Bifocals are eyeglasses with two distinct optical powers correcting vision at both long and short distances.
Man with glasses. A woman with glasses. Glasses, also known as eyeglasses or spectacles, are vision eyewear with clear or tinted lenses mounted in a frame that holds them in front of a person's eyes, typically utilizing a bridge over the nose and hinged arms, known as temples or temple pieces, that rest over the ears for support.
In January 2012, they shipped over 80,000 prescription eyeglasses, setting a service record for online sales of made-to-order prescription glasses in any one month. In 2012, the company had sold more than $1.2 billion in retail eyewear sales over the internet since inception and served more than 5 million customers. [8]
The add segment of the lens for near vision is the D-shaped area. A bifocal is a lens with two sections, separated by a line (see image to the right). Generally, the upper part of the lens is used for distance vision, while the lower segment is used for near vision. The area of the lens that caters to near vision is called the add segment.
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