| 摘要 |
A parallax-free optical zone marker for use in radial karatotomy cornea surgery for impressing a temporary circular indentation into the cornea, the circular indentation to be used as a reference for radial incisions therefrom. The marker, integrally molded, includes an elongated handle and a collar portion disposed at one end of the handle. The lower end margin of the collar is preferrably circular an adapted to impress the circular indentation into the cornea with normal hand pressure applied through the handle. A passageway extends through the collar from its upper end margin to its lower end margin. Disposed within the passageway are a pair of crossplanes intersecting, preferably at ninety degrees one to another, along the longitudinal axis of the passageway, which axis intersects the center of the circular lower end margin. These crossplanes extend along substantially the entire length of the passageway but not to the lower end margin of the collar so as to prevent contact of the crossplanes with the cornea. The intersection of the crossplanes provides the user with viewable alignment means for assisting in the accurate orientation of the circular indentation. These crossplanes preferably taper in thickness toward their intersection for enhanced accuracy in the placement of the circular indentation. The marker is molded preferably of plastic in a wide range of sizes and may also be molded of clear or translucent material to increase light availability to the cornea as the circular indentation is made.
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