| 摘要 |
<p>A vision correction arrangement is described in which a lens system has a variable optical power depending on the orientation of the user's eye. The arrangement may be an intraocular lens implant, or an extraocular device such as spectacles. The arrangement 10 comprises a fixed lens element 11 and a movable lens element 12 sensitive to the orientation of the eye, so that the optical power of the arrangement is increased when the user looks downward, and is reduced when the user's eye returns to the horizontal. The fixed lens 11 element may have a convex rear surface 14 and a concave front surface 15, and the second lens element 12 may be pivotally mounted 16, 17, 18 in front of the first lens element 11 like a pendulum. Downward inclination of the eye causes the second lens element to pivot and swing away from the fixed lens element (see figure 5). Alternatively, the movable lens 11 may slide within a channel 31 away from the fixed lens (see figures 6-7), or it may be buoyant and bend a flexible link (33, see figures 8-9).</p> |
