Su皿 mry The lens of the eye is one of the radiosensitive critical organs . We must set up 、 the radiat 莨 on treat − ment p 正 anning to prQtect it as little as posible in the reduction of the 〔 蓋 osage of the eye , not on 王 y benigh tUmOr bUt alSO malignant tumOr . In our 邑tudy , We have evaluat ' ed the technique of the radiation in the shallow lesion tumor arround the lens , suCh aS COnjUnctival tumOr . We can reduce the dosage of the Iens and comea 100 % t。 le §s than 10% using with 2mm lead

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... hield in thick in the treatment 6MeV electron beam , We found this technique is very usefull and effective 愉 cli η ical radia 亡 ion treatment planning ・