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
，大小及排列采用均匀的几何增率，
4
，共14，两变化进率拶而。
力表上的)试力字体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，大小及排列采用均匀的几何增率，4，共14，两变化进率拶而。
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