Patients whose visual acuity (VA) before surgery was< 6/60 in the better eye comprised 47% of the total case mix in poorly developed countries and 1% in developed countries (P < 0.001).

不发达国家中，手术前较好眼睛的视力低于6/60的患者占总病例组合的47%，而在发达国家中此比例仅为1%（P<0.001）。

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Preoperative visual acuity(VA)with postoperative VA were compared.

对术前和术后视力进行比较。

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