I've had a few eye exams at LensCrafters over the years, and also a few at a regular independent optometrist. What you get at LensCrafters is kind of like fast food... in that, if you were going out for a dinner, I'd compare their eye exam as to going to McDonald's where as an independent optometrist to going to a full service sit down restaurant. At LensCrafters (at least the times I have had them) you just get a quick basic test, no bells and whistles, nothing in depth. The times at the independent optometrist were much more in depth/detailed.
If you don't have any serious eye conditions, or a family history of any eye conditions, I'd just keep your appointment for this time with LensCrafters and try to go back to your regular optometrist for your next scheduled exam.