Pals fear goggle-eyed, Jello-lovin’, top comic BILL COSBY may be going blind, The ENQUIRER has learned!

The 74-year-old star suffers from a degenerative eye disease called kera­toconus that could contribute to his loss of vision, insiders say.

“Bill doesn’t want to make an is­sue of his eye condition, but it’s a real concern to his family and friends,” a close source divulged.

“I think his pals and family are greatly alarmed at his bug-eyed ap­pearance.”

Cosby – who has also suffered vision problems due to glaucoma – won three Emmys for the ’60s se­ries “I Spy,” and then dominated the ratings with his sitcom “The Cosby Show” from 1984 to 1992.

He’s now promoting a new book, “I Didn’t Ask to Be Born (But I’m Glad I Was),” while struggling with kera­toconus, a progressive disease that causes the eye’s normally dome-shaped cornea to become thin and more cone-like.

Advanced cases can cause severe vision loss and legal blindness, ac­cording to the National Keratoconus Foundation.

Asked by The ENQUIRER point-blank about the problem at a book signing in New York City on Nov. 2, Cosby sidestepped the question.

“Overall I’m feeling fine,” he said.

 “My bones creak some, but for the most part I’m all right.

"The best thing is I’m able to get up in the morning and put one foot in front of the other.”