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In a corneal surgery apparatus, a corneal shape measurement unit for measuring a three-dimensional shape of a cornea includes a measurement light projecting optical system for projecting measurement light onto the cornea and its convergent point is shifted by moving a focusing lens along an optical

In a corneal surgery apparatus, a corneal shape measurement unit for measuring a three-dimensional shape of a cornea includes a measurement light projecting optical system for projecting measurement light onto the cornea and its convergent point is shifted by moving a focusing lens along an optical axis, a measurement light receiving optical system including a photo-detector for receiving reflected light from the cornea and its convergent point is shifted by moving a focusing lens along an optical axis, a scanning unit for shifting a projection spot of the measurement light on the cornea in XY directions and an arithmetic unit for performing arithmetic to obtain the three-dimensional shape of the cornea from a position of the projection spot, a result detected by the photo-detector and a position to which the focusing lens is moved.

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In a corneal surgery apparatus, a corneal shape measurement unit for measuring a three-dimensional shape of a cornea includes a measurement light projecting optical system for projecting measurement light onto the cornea and its convergent point is shifted by moving a focusing lens along an optical

In a corneal surgery apparatus, a corneal shape measurement unit for measuring a three-dimensional shape of a cornea includes a measurement light projecting optical system for projecting measurement light onto the cornea and its convergent point is shifted by moving a focusing lens along an optical axis, a measurement light receiving optical system including a photo-detector for receiving reflected light from the cornea and its convergent point is shifted by moving a focusing lens along an optical axis, a scanning unit for shifting a projection spot of the measurement light on the cornea in XY directions and an arithmetic unit for performing arithmetic to obtain the three-dimensional shape of the cornea from a position of the projection spot, a result detected by the photo-detector and a position to which the focusing lens is moved. /291; US-5499973, 19960300, Saab, 604/096; US-5569195, 19961000, Saab, 604/096; US-5624392, 19970400, Saab, 604/043; US-5755690, 19980500, Saab, 604/096; US-5837003, 19981100, Ginsburg, 607/106; US-5879329, 19990300, Ginsburg, 604/093; US-5902268, 19990500, Saab, 604/096; US-5989238, 19991100, Ginsburg, 604/500; US-6004289, 19991200, Saab, 604/096; US-6019783, 20000200, Philips et al., 607/105; US-6042559, 20000300, Dobak, III, 604/007; US-6096068, 20000800, Dobak, III et al., 604/105; US-6110168, 20000800, Ginsburg, 606/027; US-6126684, 20001000, Gobin et al., 604/113; US-6146411, 20001100, Noda et al., 607/105; US-6149670, 20001100, Worthen et al., 607/003; US-6149673, 20001100, Ginsburg, 607/096; US-6149676, 20001100, Ginsburg, 607/106; US-6149677, 20001100, Dobak, III, 607/106; US-6165207, 20001200, Balding et al., 607/105; US-6224624, 20010500, Lasheras et al., 607/105; US-6231594, 20010500, Dae, 607/096; US-6231595, 20010500, Dobak, III, 607/106; US-6235048, 20010500, Dobak, III, 607/104; US-6238428, 20010500, Werneth et al., 607/105; US-6245095, 20010600, Dobak, III et al., 607/105; US-6251129, 20010600, Dobak, III et al., 607/105; US-6251130, 20010600, Dobak, III et al., 607/105 ing to either said first position or said second position of said safety ring. 2. A gas powered hypodermic jet injection device, said device comprising: a device body having provision for engaging with and carrying a jet injection cartridge, wherein said device body further includes a latching member in a respective first position securing the jet injection cartridge to said device body, and in a respective second position said latch member allowing said jet injection cartridge to engage with or disengage from said device body; a gas piston reciprocable in said device body and cooperable with the jet injection cartridge to effect a jet injection in response to communication of pressurized gas to said gas piston; a valve device for effecting communication of pressurized gas to said gas piston in response to movement of said valve device from a first to a second position; and a safety ring rotationally carried on said device body and in a respective first position preventing movement of said valve device from said first to said second position, said safety ring being rotationally movable to a respective second position in which said valve device is movable from said first to said second position, said safety ring including a portion which in said respective second position of said safety ring aligns with and blocks said latch member from moving from said first position of said latch member to said second position of said latch member. 3. The jet injection device of claim 2 wherein in said respective first position of said safety ring, said portion of said safety ring is moved out of alignment with said latch member, so that in said second position of said safety ring said latch member is movable to said second position of said latch member. 4. The jet injection device of claim 2 wherein said device defines a recess extending axially and including a pair of lateral extensions for receiving latching lugs carried on said injection cartridge, said safety ring including a plate-like portion partially closing a forward side of said safety ring, and defining an aperture matching said recess in shape to receive said injection cartridge including said latching lugs, in said first position of said safety ring, said aperture of said safety ring being congruent with said recess to allow said injection cartridge to move axially in and out of said recess; and in said second position of said safety ring, said aperture being rotationally disposed relative to and non-congruent with said recess so that said injection cartridge is either trapped in said recess or prevented from entering said recess by confrontation of said latching lugs with respective portions of said plate-like portion of said safety ring. 5. The jet injection device of claim 2 wherein said latching member includes a latch plate slidably movable laterally of said device body, and said latch plate defining an aperture through which a portion of said injection cartridge is received, said device including a plate-like spring member including an axially and radially extending spring arm portion, and said spring arm portion yieldably engaging said latch plate to yieldably bias said latch plate to a first position in which it latchingly engages said injection cartridge, said latch plate including an outwardly disposed finger pad by which said latch plate may be moved to a second position unlatching from said injection cartridge, and said axially and radially extending spring arm of said plate-like spring member elastically yielding to allow movement of said latch plate member to said second position. 6. The jet injection device of claim 2 wherein said latching member includes a latch plate slidably movable laterally of said device body, and said latch plate defining an aperture through which a portion of said injection cartridge is received, said device including a plate-like spring member including an axially and radially extending spring arm portion, and said spring arm po