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right were going to be looking at the subject of transposition which relates to toric lenses and its very important to understand how to do transposition because if you are making up glasses for someone whos got astigmatism they will need toric lenses and you need to understand the principles of doing neutralization and transposition in order to make up glasses for that particular person so a toric lens has two powers that runs at 90 degrees to each other and there are two different ways of writing the same thing so Im going to give you an example so lets for example say that we have a + 0 7 5 + 150 axis 25 so this is a a prescription which is for a toric lens youve got three components youve got a sphere you have a sill and youve got an axis and all toric lenses have got these three components now if you want to transpose that and write it in its other form youll end up with this youll end up with plus 2 - 5 minus 150 axis 1 1 5 and Im going to just now explain how you do i