| 摘要 |
<p>A spectacle comprises a frame and a pair of compound lenses, and the lens is composed of a spherical lens and a triple prism, which becomes gradually thicker toward a nose side. The dioptric power of the lens ranges from 2.OODS to 8.OODS, and the dioptric power of the prism ranges from 20 to 12A. Alternatively, the dioptric power of the lens ranges from 0.75DS to -8.OODS, and the dioptric power of the prism ranges from 20 to 120. The compound lens can further comprise a column lens, the dioptric power of which ranges from +6.OODC to -6.OODC. The strain of the eyes caused by sustained near work can be adjusted and reduced by the use of the spectacle, so that the spectacle can not only be used to prevent from myopia, hyperopia or further deterioration of eyesight, but also be used to remedy myopia or hyperopia.</p> |
