a therapeutic agent for ophthalmic diseases containing laennec as an active ingredient . laennec , the active ingredient , exhibits a therapeutic effect on a wide variety of ophthalmic diseases by increasing tears and the like and is highly safe even though it is an animal - derived component . therefore , the therapeutic agent is applicable to the prevention and / or treatment of various types of ophthalmic diseases , particularly corneal disorders , dry eye , asthenopia , inflammatorily ophthalmic diseases and ophthalmnic diseases caused by active oxygen .