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Optical Crosses and Prescription Transposition

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Jay Rumsey, OD, FAAO. Optical Cross to SRx #1 ... Draw Crosses. Algebracally Add Meridians. Form Result. From Most Plus Sphere. Transpose to Plus Cyl ... – PowerPoint PPT presentation

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Title: Optical Crosses and Prescription Transposition


1
Optical CrossesandPrescription Transposition
  • Jay Rumsey, OD, FAAO

2
Optical Cross to SRx 1
  • Given
  • 2.00 DS cross
  • -1.00 _at_ 030 andplano _at_ 120 DC
  • Draw Crosses
  • Algebracally Add Meridians
  • Form Result
  • From Most Plus Sphere
  • Transpose to Plus Cyl

3
Optical Cross to SRx 1
  • 2 plano_at_120
  • 2 -1_at_030
  • Combine 2_at_120
  • 1_at_030
  • Given
  • 2.00 DS cross
  • -1.00 _at_ 030 andplano _at_ 120 DC
  • Draw Crosses
  • Algebracally Add Meridians
  • Form Result
  • From Most Plus Sphere
  • Transpose to Plus Cyl

4
Optical Cross to SRx 1
  • 2 plano_at_120
  • 2 -1_at_030
  • Combine 2_at_120
  • 1_at_030
  • Results in Minus Cyl Form
  • 2.00 1.00 x 120
  • Transpose
  • 1.00 1.00 x 030
  • Given
  • 2.00 DS cross
  • -1.00 _at_ 030 andplano _at_ 120 DC
  • Draw Crosses
  • Algebracally Add Meridians
  • Form Result
  • From Most Plus Sphere
  • Transpose to Plus Cyl

5
Optical Cross to SRx 2
  • Given
  • -2.00 DS cross
  • -1.00 _at_ 045 andplano _at_ 135 DC
  • Draw Crosses
  • Algebracally Add Meridians
  • Form Result
  • From Most Plus Sphere
  • Transpose to Plus Cyl

6
Optical Cross to SRx 2
  • -2 plano_at_135
  • -2 -1_at_045
  • Combine -2 _at_ 135
  • -3_at_045
  • Given
  • -2.00 DS cross
  • -1.00 _at_ 045 andplano _at_ 135 DC
  • Draw Crosses
  • Algebracally Add Meridians
  • Form Result
  • From Most Plus Sphere
  • Transpose to Plus Cyl

7
Optical Cross to SRx 2
  • -2 plano_at_135
  • -2 -1_at_045
  • Combine -2 _at_ 135
  • -3_at_045
  • Results in Minus Cyl Form
  • -2.00 1.00 x 135
  • Transpose
  • -3.00 1.00 x 045
  • Given
  • -2.00 DS cross
  • -1.00 _at_ 045 andplano _at_ 135 DC
  • Draw Crosses
  • Algebracally Add Meridians
  • Form Result
  • From Most Plus Sphere
  • Transpose to Plus Cyl

8
SRx to Optical Crosses 1
  • Given
  • -3.00 4.00 X 150
  • Find Most Plus Meridian
  • -3.00 _at_ 150
  • Determine PL-CYL
  • -4.00 _at_ 060
  • Place on Optical Crosses
  • (Extra Plus Cyl Form)
  • Transpose

9
SRx to Optical Crosses 1
  • Given
  • -3.00 4.00 X 150
  • Find Most Plus Meridian
  • -3.00 _at_ 150
  • Determine PL-CYL
  • -4.00 _at_ 060
  • Place on Optical Crosses
  • (Extra Plus Cyl Form)
  • Transpose
  • -3 plano_at_150
  • -3 -4_at_060
  • Minus Cylinder Form
  • Optical Cross
  • -3_at_150
  • -7_at_060

10
SRx to Optical Crosses 1
  • Given
  • -3.00 4.00 X 150
  • Find Most Plus Meridian
  • -3.00 _at_ 150
  • Determine PL-CYL
  • -4.00 _at_ 060
  • Place on Optical Crosses
  • (Extra Plus Cyl Form)
  • Transpose
  • Optical Cross
  • -3_at_150
  • -7_at_060
  • (Plus Cylinder Form)
  • -7 4_at_150
  • -7 plano_at_060
  • Transpose -7.004.00X060

11
SRx to Optical Crosses 2
  • Given
  • 3.00 4.00 X 150
  • Find Most Plus Meridian
  • 3.00 _at_ 150
  • Determine PL-CYL
  • -4.00 _at_ 060
  • Place on Optical Crosses
  • (Extra Plus Cyl Form)
  • Transpose

12
SRx to Optical Crosses 2
  • Given
  • 3.00 4.00 X 150
  • Find Most Plus Meridian
  • 3.00 _at_ 150
  • Determine PL-CYL
  • -4.00 _at_ 060
  • Place on Optical Crosses
  • (Extra Plus Cyl Form)
  • Transpose
  • 3 plano_at_150
  • 3 -4_at_060
  • Minus Cylinder Form
  • Optical Cross
  • 3_at_150
  • -1_at_060

13
SRx to Optical Crosses 2
  • Given
  • 3.00 4.00 X 150
  • Find Most Plus Meridian
  • 3.00 _at_ 150
  • Determine PL-CYL
  • -7.00 _at_ 060
  • Place on Optical Crosses
  • (Extra Plus Cyl Form)
  • Transpose
  • Optical Cross
  • 3_at_150
  • -1_at_060
  • (Plus Cylinder Form)
  • -1 4_at_150
  • -1 plano_at_060
  • Transpose -1.004.00X060
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