Clark Ashton Smith's "A Star-Change" aka "The Visitors from Mlok" (short story, free): Being appropriately human considered better than being more than human
Only problem is: local lights & sounds are hard on humans senses, & make Sarkis sick. So aliens treat his senses so he'll be comfortable.
Later, Sarkis needs to be returned to earth in a hurry because of a local emergency. And he discovers his altered senses now find earth's normal sensations unbearable...
- C L Moore's "The Bright Illusion": A man, with altered senses, falls in love with an alien "women" on a world whose light & sounds will be unbearable to humans.
Fact sheet.First published: Wonder Stories, May 1933.
Download full text from Eldritch Dark.
Related: Stories of Clark Ashton Smith.