## Sunday, July 31, 2011

### How to transpose an eyeglass prescription easily !

Learn how to transpose an eyeglass prescription easily by learning a few simple rules!

Transposing a prescription is one of the most common actions when working in an optical laboratory, doctor’s office or even on a retail floor when an optician.  Some eye doctors prescribe eyeglasses in what is called plus cylinder, and others do so in minus cylinder.  Regardless of which is used, the prescriptions are the same.  This can be proven by transposing the eyewear prescription.

Transpose a prescription written in plus cylinder form to minus cylinder form as follows:

1. Add the sphere and cylinder powers to determine the new sphere power.
2. Change the sign of the cylinder.
3. Change the axis by 90 degrees.

Example 1:
 Transpose -3.00 +2.00 x 30 Step 1 Add the sphere and cylinder powers to determine the new sphere power. (-3.00) + (+2.00) = -1.00 Step 2 Change the sign of the cylinder -2.00 Step 3 Change the axis by 90 degrees. (if the axis is 90 or less than 90, add 90 degrees to the axis, if the axis is greater than 90 deduct 90 from the axis) 120 The transposed prescription is: -1.00 -2.00 x 120

Example 2:

 Transpose -3.00 -2.00 x 30 Step 1 Add the sphere and cylinder powers to determine the new sphere power. (-3.00) + (-2.00) = -5.00 Step 2 Change the sign of the cylinder +2.00 Step 3 Change the axis by 90 degrees. (if the axis is 90 or less than 90, add 90 degrees to the axis, if the axis is greater than 90 deduct 90 from the axis) 120 The transposed prescription is: -5.00 +2.00 x 120

Example 3:

 Transpose +3.00 -2.00 x 30 Step 1 Add the sphere and cylinder powers to determine the new sphere power. (+3.00) + (-2.00) = +1.00 Step 2 Change the sign of the cylinder +2.00 Step 3 Change the axis by 90 degrees. (if the axis is 90 or less than 90, add 90 degrees to the axis, if the axis is greater than 90 deduct 90 from the axis) 120 The transposed prescription is: +1.00 +2.00 x 120

Example 4:

 Transpose +3.00 +2.00 x 30 Step 1 Add the sphere and cylinder powers to determine the new sphere power. (+3.00) + (+2.00) = +5.00 Step 2 Change the sign of the cylinder -2.00 Step 3 Change the axis by 90 degrees. (if the axis is 90 or less than 90, add 90 degrees to the axis, if the axis is greater than 90 deduct 90 from the axis) 120 The transposed prescription is: +5.00 -2.00 x 120

credit: opticianworld, ehow, laramyk

#### 72 comments:

1. +1.00/-2.50 cyl 180

1. -1.5/+2.5*90

2. i think cylinder is greater no change required in this number

3. -4 sph+4cylaxis90

4. -4 sph+4cylaxis90

2. -4.00 X 180 how we do transposition for it ?

3. -4.00 X 180 how we do transposition for it ?

1. -4.00 × 180 is equal to 0.00 -4.00 × 180
as per the above formula, transposed SPH will be (0.00 + -4.00)= -4.00
transposed CYL will be +4.00
and transposed axis will be (180-90)= 90
it means the transposition for -4.00×180 will be -4.00 +4.00 ×90.

2. Ans: +4.00×90°

4. Whatbabout when You want to transpose a negative cylinder to plus, can You show a step by step. I like Your explanation.

5. Whatbabout when You want to transpose a negative cylinder to plus, can You show a step by step. I like Your explanation.

1. I have added three more different examples to understand more..Hope this will help you.

6. I like the way you are explaining except that for example in this one I can not understand it the spherical equivalent of (-2.00+3.00 x090 why is the answer -0.50

1. Thank you for the comment. But I couldn't find the power which you have said in your query?
If you want to transpose -2.00+3.00x90;
Transposition will be: +1.00 -3.00x180

2. This comment has been removed by the author.

3. If you want to transpose-2.00+3.00×90; Transposition will be +1.00-3.00×90;on axis 90 to change opsosite to 180 ; an 180 axis change to 90 just simple Technique

7. -3.00 +2.00 x 130

1. Transposed Rx is -1.00 -2.00 x 40

8. I've heard the term acylinder lenses before. What does that refer to? Is it a new term, or is it just an incorrect one? I was under the impression that all lenses are roughly cylindrical and that they don't work otherwise.
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9. thanx...really helpful :)

10. hw to transpose wen cycloplegic has been added and distance is 2/3 m....??

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13. I have Right eye power : +2.25, CYL: +1.25, Axis: 180
And Left eye power : +1.25, CYL: +0.75, Axis: 165

It shows calculate prescription as follows:
Right(OD) 4 -1.75 90
Left(OS) 2 -0.75 75
But how i can order lenses online their is no CLY option for plus power in any websites?

1. Could you please provide any lens ordering website link? so that I can tell you how.

2. But the transposition for the given prescription is;
R +3.50 -1.25 x 90 (you have mentioned as +4.00 -1.75)
L +2.00 -0.75 x 75

3. would you please explain how you did that? thank you.

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19. -4.00/+2.00 axis 140

20. -4.00/+2.00 axis 140

1. The transposition will be
-2.00/-2.00 axis 50

2. Plano/+2.00*140

3. +4.00/+2.00×140

4. Plz reply nd solve my confusion

21. What about this one
-4.50@90, +2.25@180

22. Transpose an eyeglass prescription is very important for prescription glasses retailer. Some of the retailer don't know the exact prescription transpose. If we use the best performance glasses, it wouldn't a big deal for us.

I am using some eyeglasses over 2+ years and I am not getting any problem there. I got it from online eyeglasses.

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24. What about transpert -4.50 shere to mius cylinder

25. What about transpert -4.50 shere to mius cylinder

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27. easy way to transpose tnx du

28. This comment has been removed by the author.

29. Please transposition this PRESCRIPTION:( +0.75 -0.75 @85 ) & ( +0.25 -0.25 @90 )

30. Please transposition this PRESCRIPTION:( +0.75 -0.75 @85 ) & ( +0.25 -0.25 @90 )

31. This comment has been removed by the author.

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40. Please transposition-0.50/+0.50×180

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45. Transpose+1/_3×180

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49. What about -0.25/-0.25*180 being transposed?

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