| Unlike spherical lenses, aspheric lenses have | | | | clear vision than traditional spherical lenses. Those |
| different curvatures on their front surface. It is | | | | conventional lenses have a narrower clear vision |
| commonly known that spherical lenses have the | | | | area, so that vision distortion may be aroused if |
| same curve across their entire surface. The | | | | you look away from the lens center. |
| changes in curvature allow aspheric lenses to have | | | | With flatter curves, the center of an aspheric lens |
| flatter curves than conventional lenses, bringing | | | | fit closer to the wearer’s face. These |
| thinner and slimmer appearance. | | | | aspheric lenses bring both more natural external |
| In conventional lens types, a heavy prescription | | | | world and more natural wearer’s eyes. |
| usually requires thick lenses to provide enough | | | | Spherical lenses for heavy hyperopia magnify |
| visual correction. Those current thinner aspheric | | | | both the wearer’s eyes and the surrounding |
| lenses eliminate worries about thick lenses for | | | | objects, while those conventional lenses for |
| people with serious vision problems. These flatter | | | | myopia minify these things. Both of these two |
| lenses also bring less bulging from the frame. In | | | | opposite visual distortions bring unnatural images. |
| most cases, an aspheric design is combined with | | | | What’s worse, they result in |
| high-index lens materials, resulting in extremely | | | | “bug-eyed” or “beady-eyed” |
| slimmer, thinner and slighter lenses. Besides usual | | | | appearance. |
| high-index materials, regular plastics can also be | | | | Aspheric lenses are now available both in single |
| used to manufacture aspheric lenses. | | | | vision types and multifocal types. Complex curves |
| Although all aspheric lenses offer a slimmer | | | | on aspheric lenses require more time and skills |
| appearance for every prescription, they have | | | | from the optician in lens measurements and |
| different shapes while dealing with different vision | | | | fitting, so that a higher price is reasonable. Their |
| problems. Aspheric lenses for myopia correction | | | | cosmetic and visual benefits deserve a high price. |
| are thinnest at the center and thickest at the | | | | The frame selection of aspheric lenses is also a |
| edge, while those for hyperopia correction are | | | | little more complex than that of spherical lenses. |
| thicker in the center and thinner in the edge. Even | | | | In addition, anti-reflective coating is nearly |
| if certain portions of aspheric lenses are thicker | | | | necessary for all aspheric lenses, since the closer |
| than other parts, they do have brought an overall | | | | distance between the lens and the wearer’s |
| thickness reduction. | | | | eye brings more reflection from the lens’ |
| Just like expensive aspheric camera lenses, | | | | front and back surfaces. |
| aspheric eyeglass lenses provide a wider area of | | | | |