###Human: Post-pterygium surgery my uncle has a feeling of thick eyelid, why? ###Assistant: Hi. The cause for his present complaint is due to the surgical trauma induced by the surgery. In pterygium surgery, the mass of tissue is cut and scraped off and then a graft is placed to cover the defect. Our eyes are so sensitive, that even when an eyelash accidentally falls in the eye, it becomes so uncomfortable. Now a whole area has been actually cut and the graft sutured, so definitely, until the healing is completed the symptoms of heaviness, dryness will continue. This usually takes about a month to heal. Regarding the eye drop, I do not think it should matter much. If you can change it easily for any ophthalmic drop, then it will be better.