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(),(,325027);;R770.43C1008-1801(2000)01-0056-03[],,,,,,,,:;;;,2/3,,7080,,90,,Placido,,1,,(1),,,:h/h=f/x=-r/2x,:r=2mx,1:2000-02-20:,,RGPm,xd,:r=2md,,,,3mm2Placido,34mm,,,,,,,,,PlacidoPlacido,,,,2,,,,Placido,Placido,,,2Placido3Placido,,,,,,Placido,,(computer-assistedcornealtopographicanalysissystem,),,Placido,,,,,3.1,,,,,,:;;,65ChinJOptomOphthalmol2000,Vol.2,No.1;;;3.4,,:A;B=;C,,4mm,,:I/O=P/P,I:,O:,P:,P:f=R/2,f:,R:3,P,Pf,I/O=R/2P,,R=2IP/O:O,P,,IRI/R=O/2P=,,,,,,,,,,,,,3.5,,3.5.1:,;;,4,,,,,3.5.24,,1mm1mm,,36043.5.34,,,,,,(),,3.5.4:,,,,,44.5D,1.5D,50.5D35.5D,1D,43.0D0.25D0.5D1D2D,,,,1134D,56D,22D,11,2D14,0.250.501D,,,,0.25D,,,,3.5.5:,,,,,,,752000213.5.6:,,,,,0.5DPRK3.5.7:,,(5),,,53.5.8:,,,,,,3.5.9Placido:Placido,,,,,Placido()(:)(55),,,:,,,,-8.00DS-5.50DS-7.25DS-5.00DS,4.00D,,::-5.50DS/-2.50DC180,15mm,,,,,,,:-5.00DS/-2.25DC180,()(:)85ChinJOptomOphthalmol2000,Vol.2,No.1