The FDA working group met and requested a full copy of that survey article below that indicates that 21% of Doctors admitted they reuse microkeratome blades for LASIK.

Is there a limit to how many patients a blade can be reused on?  How many patients was each blade used on in the clinical trials?  The FDA has Not even responded to these questions yet.  How long does it take to answer simple questions like these?

See reference below.
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Most respondents (78.7%) changed the microkeratome blade between patients while 49% in Europe and 36.4% in Oceania preferred to change the microkeratome blade between eyes. These preferences were similar to those in the 2003 survey. The microkeratome blade was changed after 2 or more patients by 11 .l% of Asian respondents and 55.0% of Latin American respondents, which was similar to the pattern in the 2003 survey (17.5% and 50.0%, respectively).

Surgical Technique:

Ninety-seven percent of respondents would treat a pupil larger than the ablated area in patients with low myopia (<-6.0 diopters [Dl), and 70.1% would treat a pupil larger than the ablated area in patients with high myopia (> -6.0 D).

http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=pubmed&dopt=Abstract&list_uids=15721716&query_hl=1