首楞嚴義疏注經 9.207

9.207

正明也。前已目明，今復暗破，故無幽黯。色既質礙，障隔不通，故成幽暗。今定慧發明，破其陰覆，洞然明顯，故云陰盡。

Directly explaining. The eyes were already clear before, and now darkness is further destroyed, hence there is no dense darkness. Since form is resistant matter, obstructing and blocking without passage, it becomes dense darkness. Now that concentration and wisdom shine forth, breaking its aggregate-cover, opening up wide and clearly, it is called the exhaustion of the aggregate.