新圆柱面透镜概述课件.ppt

1、v剪刀运动正柱镜，正柱镜，逆剪刀逆剪刀负柱镜负柱镜顺剪刀顺剪刀3PPT课件v鉴定球面还是柱面v确定柱镜的主子午线5PPT课件Action of a plus cylinderThis is a crossline chart.On the next mouse click you will place a plus cylinder held with its axis VERTICAL in front of the chartNotice that the limbs appear to be in their original positions but that just the ve

2、rtical limb is magnified in the horizontal meridian.On clockwise rotation of the cylinder,the vertical limb rotates anticlockwise andthe horizontal limb rotates clockwise towards it in a SCISSORS MOVEMENT.Further clockwise rotation of the cylinder,produces further SCISSORS MOVEMENT.Rotating the cyli

3、nder back again causes the limbs to,SCISSOR back to their original position.You can emulate the actual movement seen during the rotationtest by RIGHT clicking four times back through this sequence.The cylinder axis can be marked on the lens when it has been rotated tothis position where a continuous

4、 appearance of the crosslines is obtained.6PPT课件On the next mouse click you will place a minus cylinderheld with its axis VERTICAL in front of the chartNotice that the limbs appear to be in their original positions butthat just the vertical limb appears minified in the horizontal meridian.Action of

5、a minus cylinderOn clockwise rotation of the cylinder,the vertical limb also rotates clockwise andthe horizontal limb rotates anticlockwise towards it in a SCISSORS MOVEMENT.Further clockwise rotation of the cylinder,produces further SCISSORS MOVEMENT.Rotating the cylinder back again causes the limb

6、s to,SCISSOR back to their original position.You can emulate the actual movement seen during the rotationtest by RIGHT clicking four times back through this sequence.The cylinder axis can be marked on the lens when it has been rotated tothis position where a continuous appearance of the crosslines i

7、s obtained.Ophthalmic Lenses&Dispensing7PPT课件v视觉像移及旋转实验判断性质和轴向v取性质相反负镜片与待测镜片叠合，注意两镜片轴向一致，光心相重9PPT课件v持叠合镜片再次做旋转实验，根据结果调换镜片，直至没有剪刀运动v根据已知镜片记录未知镜片10PPT课件+2.00 X 180-2.00 X 90+2.000-2.00012PPT课件+2.00DC+1.00DC0+0=+3.00DC0+3.00DC0+-3.00DC0=0.00DC0+3.00 X 180-3.00 X 90+3.000-3.00016PPT课件+3.00DC0+0+3.00DC=+3.00DC+3.00DC 0+3.00DC=+3.00DC+3.00DC-3.00DC0+v+2.00 X 180-6.00 X 90+2.000-6.00019PPT课件 0+3.00DC0+1.00DC=+3.00DC+1.00DC+1.00DC+2.00DC+3.00DC-2.00DC 0-3.00DC0+1.00DC=-3.00DC+1.00DC+1.00DC-4.00DC-3.00DC+4.00DC