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Calculate the power of the soft sphere contact lens for the following patient: 

1. +4.00 -1.00 x090:

2. +3.00 -0.25 x090: 

3. -4.00 +0.50 x090: 

4. -10.00 -0.50 x180: 

5. +9.50 +1.00 x180: 

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