散光鏡片度數的記載+2.0D sphere with cylinder -3.0D axis 90°與下列何者是相當的?
A-2.0D sphere with cylinder +3.0D axis 180°
B-2.0D sphere with cylinder -3.0D axis 90°
C-1.0D sphere with cylinder +3.0D axis 180°正確答案
D-1.0D sphere with cylinder +3.0D axis 90°
答案與詳解
新球面=+2.0+(-3.0)=-1.0 ✓;柱面-3.0變+3.0 ✓;軸度90°+90°=180° ✓。三步驟全部正確,為等價表達式。
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