永久的失明用英语怎么说？

永久的失明

irrecoverable loss of sight

irrecoverable

adj. 无可挽救的，不可弥补；

例句
The depression, however, caused many irrecoverable accounts and Dr. Sim started to run up debts.
然而经济萧条造成许多呆帐,他也因此负债累累.

loss

n. 损失，减少，丢失，遗失，损耗，亏损，失败；

例句
The company cannot accept responsibility for loss or damage.
公司不承担丢失或损坏的责任。

of

prep. 关于，属于…的，由…制成；aux. 助动词 [非标准用语、方言] =have [主用于虚拟语气]；

例句
He did have a real knowledge of the country...
他对该国的确知之甚多。

sight

n. 视力，看见，视野，景象；vt. 看见，发现，瞄准，观察，调准瞄准器；vi. （用仪器）瞄准，观察；

例句
There are places you can take physically handicapped children where staff don't blanch at the sight of a wheelchair.
有些地方你能带残疾儿童去，那里的工作人员不会一看到轮椅就退缩。