The E optotype on the chart had 3 limbs of equal length.A regular geometric progression of optotype sizes and distribution was employed to arrange 14 lines with 4 optotypes on each line.
采用三划等长的E形视
，视大小及排列采用均匀的几何增率，每行视数为4个，共14行，每两行视变化进率为拶而。
The E optotype on the chart had 3 limbs of equal length.A regular geometric progression of optotype sizes and distribution was employed to arrange 14 lines with 4 optotypes on each line.
采用三划等长的E形视，视大小及排列采用均匀的几何增率，每行视数为4个，共14行，每两行视变化进率为拶而。
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，
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