| 摘要 |
<p>A laser 1 device, for use in ophthalmology, and optionally comprising a UV pulsed laser, has a beam distributor 3 therefor located across the path of the laser beam 2, the distributor 3 being an optical system having, on a common optical axis, e.g. two taper lenses 5, 6 and a telescopic objective 7, and being capable of transforming a parallel cylindrical beam from the laser source 1 into a variable-diameter D2 annular beam 20 with a maximum diameter comparable with the diameter of a human cornea 4. <IMAGE></p> |
