On page 18 of the Jehovah's Witnesses book Life: How did it get here? we find the quote:
The eye appears to have been designed.The clear implication, just from this bald quote, is that Jastrow believes the eye was designed.
The Enchanted Loom, Page 96
That is a false impression. Jastrow used the word "appears" because he was arguing that evolution has unsolved problems. However, he then said that the puzzles are small compared to the huge quantity of evidence that evolution did happen. He concluded the chapter by saying, on page 101:
The fact of evolution is not in doubt.
Jastrow is an astronomer, not a biologist or paleontologist, and he apparently was not aware that the eye is considered to be a solved problem. In his defence, Jastrow's book was published several years before Richard Dawkins wrote his excellent explanations of the subject.
In any case, there is now a highly developed theory of how an eye would have evolved. It is estimated that a fish eye could arise in about one thirtieth of one percent of a billion years.