一氧化氮 (ｎｉｔｒｉｃｏｘｉｄｅ ,ＮＯ)作为一类新发现的神经递质 ,在神经系统中发挥了重要的信使作用。此外 ,在某些情况下 ,ＮＯ具有一定的神经毒性作用 ,可导致神经元变性[1] 。视网膜光性损伤也表现为神经元变性过程。我们用ＮＡＤＰＨ黄递酶组织化学染色法研究了大鼠视 Nitric oxide (NO), as a newly discovered neurotransmitter, plays an important messenger role in the nervous system. In addition, NO has some neurotoxic effects in some cases, leading to degeneration of neurons [1]. Retinal photodamage is also manifested as neuronal degeneration. We used NADPH diaphorase histochemical staining of rat visual