| Progressive lenses for presbyopia have some | | | | power gaps. Moving sight across these visible lines |
| advantages over traditional bifocal lenses and | | | | of bifocals or trifocals, a wearer is probably to |
| trifocals, all of which belong to multifocal lenses. | | | | experience an image jump. In addition, trifocal and |
| There are no visible lines on progressive lenses, | | | | bifocal lenses only provide clear images within a |
| which attract certain group of people in their 40s | | | | specific range of distances. Beyond that, burry |
| who care deeply about their appearances. | | | | vision may occur. Progressive lenses avoid all |
| Furthermore, progressive lenses provide clear and | | | | these problems by providing a comfortable |
| comfortable vision at all distance including | | | | prescription transition. Discomfort of progressive |
| intermediate zone that is beyond bifocal lenses. | | | | lenses can be burry peripheral vision in some |
| As the name reflects, a bifocal lens has only two | | | | first-time wearers. |
| focal points: one for close reading and the other | | | | The wide spread of progressive lenses in the |
| for distance vision. Bifocal lenses provide very little | | | | United States has promoted the advancement of |
| help in dealing with computer work, which requires | | | | lens technologies. Today, progressive lenses with |
| special intermediate vision. Some bifocal wearers | | | | wider intermediate and reading parts are available. |
| try to see objects in intermediate range by | | | | And special occupational designs especially for |
| bobbing their heads up and down. In this way, long | | | | computer work are also provided. Modern |
| period of computer use is much more likely to | | | | progressive lenses bring fewer peripheral |
| cause computer vision syndrome. Bifocals force | | | | aberrations by applying wavefront-guided |
| computer users to maintain an unnatural posture, | | | | technology. New progressive lenses are also |
| resulting in muscle strain, neck pain and so on. | | | | compatible with smaller lens frames, which was |
| Progressive lenses provide a smooth, seamless | | | | unfeasible in the past. These small lens designs |
| progression of many lens powers, bringing | | | | offer more fashionable options. |
| comfortable vision at truly multiple distances. | | | | Materials such as high-index plastic glasses and |
| Presbyopic patients just need to look straight | | | | impact-resistant polycarbonate have been used to |
| ahead to see in the distance, move eyes slightly | | | | produce progressive lenses now. Anti-reflective |
| downward to get intermediate vision and lower | | | | coatings on progressive lenses reduce distracting |
| their gaze a bit further to manage near tasks. | | | | lens reflections and provide more attractive |
| They never need to bob head up and down or | | | | appearance. Progressive lenses are also available in |
| keep uncomfortable postures. | | | | photochromic and polarized types. |
| “Image jump” is a bothersome womens | | | | With such a wide range of options, you may ask |
| vision problem commonly aroused by bifocal or | | | | a professional optician for advice. |
| trifocal lenses because of their separate, sudden | | | | |