THIOMERSAL IS A FORM OF MERCURY, USED IN VACCINES, CONTACT LENSE SOLUTION, TATTO INK ETC:
Thiomersal (INN) (C9H9HgNaO2S), or sodium ethylmercurithiosalicylate, commonly known in the United States as thimerosal, is an organomercury compound (approximately 49% mercury by weight) used as an antiseptic and antifungal agent.
...It was developed and registered under the trade name Merthiolate in 1928 by the pharmaceutical corporation Eli Lilly and Company and
has been used as a preservative in vaccines, immunoglobulin preparations, skin test antigens, antivenins, ophthalmic and nasal products, and tattoo inks.In the U.S., the European Union, and a few other affluent countries, the compound is being phased out from vaccines routinely given to children.
Packaging the vaccines in single-dose vials eliminates the need for bacteriostatics such as thiomersal.http://en.wikipedia.org/wiki/ThimerosalTHIOMERSAL SOLUTION CAUSED 10% OF PROBLEMS IN CONTACT LENSE WEARERS
In 1989, thiomersal was responsible for about 10% of problems related to contact lenses:<49> because of this, many products no longer contain thimerosal.
^ Wilson-Holt N, Dart JK. "Thiomersal keratoconjunctivitis, frequency, clinical spectrum and diagnosis." Eye. 1989;3 ( Pt 5):581–7. PMID 2630335
1: Eye. 1989;3 ( Pt 5):581-7.Links
Thiomersal keratoconjunctivitis, frequency, clinical spectrum and diagnosis.Wilson-Holt N, Dart JK.
Moorfields Eye Hospital, London.
Thiomersal keratoconjunctivitis is a common problem in soft contact lens wearers, accounting for thirty two (10%) of three hundred and twelve consecutive referrals for contact lens related problems to an out patient department. The clinical findings in 55 patients are described, of which 42 show the 'typical' appearance of the condition. This consists of non-specific conjunctival changes, limbal follicles, superficial punctate keratopathy and superior corneal epithelial opacity. Thirteen atypical cases are presented, demonstrating superior limbitis occurring in isolation, coarse punctate keratopathy, severe keratopathy with visual loss, pseudo-dendritic corneal lesions, acute conjunctival hyperaemia without keratopathy. Symptoms were also seen in two patients who were hard lens wearers. In such atypical cases, diagnosis may be difficult but can be aided by the use of topical challenge with thiomersal.
http://www.ncbi.nlm.nih.gov/pubmed/2630335