Duochrome Test in Myopes

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I have a question..
In duochrome procedure if a patient has -2.00Dsph and the patient says that red color appears more sharper than green we add -0.25Dsph and asks and the patient says that red appear more sharper..if the patient keeps on saying it how can we determine the weakest minus sphere? I was asked this is Viva question..Also the same for hypermetropia too...can you tell me pls..

abigailselvaraj