 Site For Sight Lens
Design Guide
Lens Types
Seeing is believing. SiteForSight's qualified staff of eye doctors and opticians has carefully selected the world's most advanced lens designs, materials, and enhancements to help your eyes achieve the best vision available anywhere.
Our qualified staff of eye doctors and opticians evaluates lens brands based on a number of factors: optical quality, design, peripheral distortion, scratch resistance and anti-reflective coatings, and availability of different indexes of materials to ensure the thinnest lens design for higher prescriptions.
Single Vision Lenses
The majority of prescription lenses are single vision lenses. Single vision means that the entire lens is designed for one focal length: distance vision, computer vision, or reading only. Reading glasses have single vision lenses focus at near for reading. Lenses that are designed to help you see different focal lengths are called "multifocal" lenses-bifocal, trifocal, and progressive lenses (no-line bifocals).
Progressive Lenses, "No-Line Bifocals"
Progressive lenses are multifocal lenses, and are also known as "no-line bifocals".
Progressive lenses have three main viewing areas-far, intermediate, and near. When wearing progressive lens, there is no need to remove your glasses when looking from one distance to another. The upper portion of the lens is set for distance (driving, watching television), the middle for intermediate (computer, desk, interview distance), and the bottom for reading.
• Distance range
The upper portion of the progressive lens is designed for distance vision. This distance zone will allow for razor-sharp vision without compromise. You will have a wide field of view from left to right while looking through the distance portion. Typical distance activities include driving, watching television, viewing the board or presentations.
• Midrange intermediate distance range
Progressive lenses provide you with comfortable, clear vision intermediate distance vision. Typical midrange activities include working on the computer, viewing items on a desk, playing cards, reading sheet music, and cooking.
• Near range
The near zone of progressive lenses is optimized to the natural lowering of the eyes when reading. This means that you can read comfortably without any contortions of your head or body. Typical near activities include reading, sewing, and assembling models.
The benefits of progressive lenses are no visible lines separating these viewing areas. Progressive lenses are more cosmetically appealing and provide the smoothest transition between viewing areas. As a result of removing the visible lines, it is necessary to create areas of the lens that cannot be seen through in the periphery. For example, the progressive in the center of the lens is crystal clear while each side of middle part of the lens the lens can be slightly blurry. Imagine an hourglass with the center for viewing. As a natural adaptation to any progressive lens, you will turn your head in order to see to either side of the center of the middle of the lens. Changing your habits so that you move your head instead of your eyes is called your "adjustment". Rarely, first time progressive wearers may become dizzy or disoriented during their adjustment period and some people may not adjust well. Thus we offer to our progressive customers at no charge: The SiteForSight Progressive No-Line Bifocal Adaptation Guarantee. If you choose a progressive no line bifocal lens, after adaptation within 30 days, if you are not completely satisfied, we will refit your lenses in single vision of line bifocal at no additional charge.
 The SiteForSight progressive lens brand of choice is ZEISS from Germany. Zeiss' is the world's finest optical lens manufacturer in the world. Zeiss leads the world of optics from telescopes, satellite mirrors, surgical microscopes, planetariums and high-end binoculars to eyewaer lenses and anti-reflective coatings for your prescription lenses.
When carefully selecting our progressive no-line lens brands, we evaluate the width of the reading area, the amount of distortion when looking from distance to near, the optical clarity in the distance portion of the lens and the effectiveness of the lens for computer use.
Zeiss Progressive No-line Bifocal Lens Benefits:
• Extremely gentle transitions: the eyes glide smoothly and comfortably from the distance to the near zone.
• Up to 33% wider progressive zone guaranteeing rapid adaptation and outstanding comfort.
With Zeiss lenses, our customers enjoy the highest rate of success in adapting to progressive no line bifocals. If you have thought about trying a noline progressive bifocal lens but were concerned if you could adapt... SiteForSight has you covered with our exclusive The SiteForSight Progressive No-Line Bifocal Adaptation Guarantee.
100% Progressive Lens Computer Algorithm
Years of research with hundreds of patients benefits YOU!
Our doctors and opticians have developed a computer algorithm for successfully fitting Progressive Lenses... only at SiteForSight.com
 We live in a marvelous age of technology! Our staff doctors and opticians at SiteForSight have painstakingly developed a proprietary computer algorithm for determining the optimal position of the reading or segment height of a progressive no-line bifocal lens.
In the old days, to measure the segment height the patient wearing the frame were required to be present. Our special computer algorithm mathematical formula devised by our doctors and opticians, no longer requires you to be present.
In fact, our computer algorithm for measuring progressive segment heights has proven to be even more accurate than conventional measuring because it eliminates human measurer error!
The SiteForSight Progressive Computer AlgorithmSM has been tested on thousands of pairs of progressive lenses and is used to determine the exact height setting for your lenses.
Ordering progressive lenses from SiteForSight.com is SIMPLE and PRECISE. Regardless or where you are in the world... USA, England, Australia, China or Japan, your progressive lenses will be measured and produced as accurately as if we measured you in person.
Please feel free to contact our qualified staff of ONLINE OPTICIANS if we may be of assistance at 1.817.886.0336 or 1.866.422.8745.
Flat Top Bifocal Lenses
Bifocal lenses have two distinct viewing areas: distance at the top, and near on the bottom. With flat top lined bifocals, you can keep your glasses on to drive AND read a book. There is a visible line letting you know the areas. Flat top line bifocals offer a wide field of view and are a perfect alternative if you have trouble adapting to the Progressive no-line bifocal lens.
Trifocal Lenses
Trifocal lenses have three distinct viewing areas: far, intermediate, and near. With a trifocal lens, you can keep your glasses on for driving, computer work, AND reading. The distance portion of the lens is at the top, the intermediate portion of the lens is in the middle, and the reading portion of the lens is at the bottom.
Computer Lenses
Computer of Variable Focus Near lenses are ideally set up for your desk, computer distance on top and reading on the bottom. Computer lenses have no lines and benefit from a wide field of view... so you can glance at various items on your desk or computer screen with ease. It is important to note that you will not be able to see distance or drive in a computer lens. |