Revākhaṇḍa ascribed to the Vāyupurāṇa (RKV) 190.25

190.25

akṣirogas tathā rājaṃścandrahāsye vinaśyati /
candrahāsye tu yo gatvā grahaṇe candrasūryayoḥ /
snānaṃ samācared bhaktyā mucyate sarvapātakaiḥ //

Likewise, O king, eye disease is destroyed at Candrahāsya. / He who, having gone to Candrahāsya at an eclipse of the moon or the sun, / performs a sacred bath with devotion, is freed from all sins.