| 摘要 |
The instrument comprises: a tubular outer support forming a shell about a determined axis and including an annular bottom portion that is circularly symmetrical about the axis to define a substantially spherical annular surface of the support for application against the cornea; and a tool carrier received inside the outer support and movable relative thereto between a high position and a low position, the tool carrier including a smooth tool-holding socket whose inside wall is resiliently deformable in the radial direction, the socket being axially movable relative to the support, a resilient member disposed between the socket and the support urging the tool carrier towards its high position, and a threaded drive socket screwed into the support above the smooth socket to constitute an adjustable top abutment for the smooth socket and opposing the return effect of the resilient member.
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