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I am aware thimerosal is a preservative, it used to be used in the contact lens saline solution I used for decades. However, it is no longer used in children's vaccines. From the FDA website:

Since 2001, all vaccines recommended for children 6 years of age and younger have contained either no thimerosal or only trace amounts, with the exception of inactivated influenza vaccines, which are marketed in both the preservative-free and thimerosal-preservative-containing formulations. Thimerosal-preservative free influenza vaccine licensed for use in children six to 59 months of age is available in limited supply. Nevertheless, FDA is in discussions with manufacturers of influenza vaccine regarding their capacity to increase the supply of vaccine without thimerosal as a preservative.

http://www.fda.gov/BiologicsBloodVaccines/vaccines/QuestionsaboutVaccines/ucm070430.htm

So even though there is no evidence thimerosal causes any problems, it has been removed.