| 摘要 |
<p>A clinical refractive instrument (10) is described for adjusting dioptric power according to three orthogonal axes. The instrument (10) includes a viewing aperture (11), a plurality of spherical lenses and a pair of cylindrical lenses (21 and 41). The plurality of spherical lenses (21 and 41) are adjustable such that a selected spherical lens may be aligned with the viewing aperture (11). The pair of cylindrical lenses (21 and 41) are operative to produce a combination of astigmatic power elements J0 and J45. Each of the cylindrical lenses (21 and 41) are capable of being independently rotated, and the pair of the cylindrical lenses (21 and 41) may be super imposed with respect to each other and aligned with the viewing aperture (11) and the selected spherical lens. Methods for using (500) and controlling (400) the instrument (11) are also described.</p> |
