To assess the accuracy of routine preoperative biometry we reviewed all cases of extracapsular cataract extraction with posterior chamber implant performed at Queen Alexandra Hospital in 1985. Of 471 eyes included in the survey 67.9% were within 1.0 D of the expected refraction and 90.7% within 2.0 D. Factors influencing accuracy are discussed. The necessity of routine preoperative biometry is emphasised.
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