Usual Kaorichan with Contact Lenses & Special Eyeglassed Kaorichan.

As you see, Kaorichan always wares her soft contact lenses.

However, she sometimes her eyeglass meet her boy friend's wish as Yuchan does; Kaorichan's boy friend also likes eyeglassed girls.

Kaorichan is based on a heroine of one hentai manga Producer read.
The situation, "a girl of the heroine usually wears her contact lenses, but her boy friend prefers eyeglassed girls" is found the hentai manga, and Producer like it for settings of his original featured characters, like Kaorichan and Yuchan.