Simple Transposition of lens
Transposition of lenses means change the one form of power of lenses to another form of power is colled as transposition of lenses.
Simple transposition means rewrite the lenses power without actually changing them.
Transportation of lenses is part of ophthalmic calculations in this calculation we have to change the form of lens power with given step.
Transposition of lenses can be calculate on online calculator website or you can do it very simple three step to calculate the or to change the power of lenses.
Type of transposition of lenses
1. Simple transposition
2. Toric transposition
Three rules of simple transposition
To do a simple transposition follow the below three step to calculate the transposition value.
1. Addition of spherical and cylindrical power
2. Change the sign of cylindrical power but the value should be a same.
3. Change the axis by 90, if Axis less than 90 then add 90, if Axis more than 90 then subtract 90.
Transposition lenses calculator online
Uses of transposition of lenses
Example:
1. +1.00/+1.00@90
Ans: +2.00/-1.00@180
2. -1.00/-1.00@80
Ans: -2.00/+1.00@170
3. -2.00/+1.00@30
Ans: -1.00/-1.00@120
4. 0.00/+1.25@120
Ans: +1.25/-1.25@30
5. +3.00/-3.00@10
Ans: 0.00/+3.00@100