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This is the second part of the refraction. Your optometrist will ask you simple questions like 'which is clearer - position 1 or 2 - or question like 'is it clearer with or without' - as the optometrist shows you different combinations of lenses.
This part of the examination allows your optometrist to 'fine-tune' the exact prescription you need. (In younger children who cannot communicate, this part of the examination is often not possible).
At the end of the test, you may be asked to look at letters or figures against red and green backgrounds (the duochrome test) or you may be asked to read letters having had a lens inserted which blurrs the vision.
Once your optometrist has completed this part of the examination, he or she can determine what would be the optimal prescription to prescribe for you.