optotypes

常見例句

• 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.
  采用三劃等長的E形視標，視標大小及排列采用均勻的幾何增率，每行視標數(shù)為4個，共14行，每兩行視標變化進率為拶而。
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