Visual impairment on dentists related to occupational mercury exposure

Canto-Pereira, Luiz Henrique; Lago, Mayra Coan; Costa, Marcelo Fernandes; Rodrigues, Anderson Raiol; Saito, Cézar Akiyoshi; Silveira, Luiz Carlos de Lima; Ventura, Dora Fix

doi:10.1016/j.etap.2004.12.015

Cited by 43 publications

(35 citation statements)

References 20 publications

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“…These results confirm color vision losses reported for other groups of individuals exposed to metallic mercury: dentists, with chronic exposure at low levels (16), and gold miners (5). They also agree with reports of color vision impairment found in riverine communities exposed to methylmercury (17,18).…”

supporting

confidence: 82%

Long-term loss of color vision after exposure to mercury vapor

Feitosa-Santana¹,

Costa²,

Lago³

et al. 2007

Braz J Med Biol Res

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We evaluated the color vision of 24 subjects (41.6 ± 6.5 years; 6 females) who worked in fluorescent lamp industries. They had been occupationally exposed to mercury vapor (10.6 ± 5.2 years) and had been away from the source of exposure for 6.4 ± 4.04 years. Mean urinary concentration of mercury was 40.6 ± 36.4 µg/g creatinine during or up to 1 year after exposure and 2.71 ± 1.19 µg/g creatinine at the time of color vision testing or up to 1 year thereafter. All patients were diagnosed with chronic mercury intoxication, characterized by clinical symptoms and neuropsychological alterations. A control group (N = 36, 48.6 ± 11.9 years, 10 females, 1.5 ± 0.47 µg mercury/g creatinine) was subjected to the same tests. Inclusion criteria for both groups were Snellen VA 20/30 or better and absence of known ophthalmologic pathologies. Color discrimination was assessed with the Farnsworth D-15 test (D-15) and with the Lanthony D-15d test (D15d). Significant differences were found between the two eyes of the patients (P < 0.001) in both tests. Results for the worst eye were also different from controls for both tests: P = 0.014 for D-15 and P < 0.001 for D-15d. As shown in previous studies, the D-15d proved to be more sensitive than the D-15 for the screening and diagnosis of the color discrimination losses. Since color discrimination losses were still present many years after the end of exposure, they may be considered to be irreversible, at least under the conditions of the present study.

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supporting

confidence: 82%

Long-term loss of color vision after exposure to mercury vapor

Feitosa-Santana¹,

Costa²,

Lago³

et al. 2007

Braz J Med Biol Res

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show abstract

“…Psychophysical chromatic red-green and blue-yellow CS were also tested and showed a reduction for low and middle spatial frequencies. Dentists exposed to mercury vapor due to the use of dental amalgam in restorative work showed a diffuse impairment (comprising low to high spatial frequencies) in CS measured psychophysically for luminance and for chromatic stimuli [161]. Those results also confirm psychophysical finding from other authors measuring the CS in methylmercury intoxicated patients [145,156,162].…”

Section: Mercury Vapor Intoxicationsupporting

confidence: 81%

The Visual (dis)Function in Neurological Diseases

Fern

Costa²

2013

J Neurol Neurophysiol

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“…I en studie av tannleger med lave nivåer av kvikksølv i urinen (5 g/l) fant man redusert fargesyn ved bruk av Lanthonys desaturerte test og Cambridge color test og ved fargesensitivitetstester (lysstyrke, rød -grønn og gul -blå) (14). I flere studier er det bekreftet at fargesynet kan påvirkes ved moderat kvikksølveksponering (14 -18).…”

Section: Diskusjonunclassified

“…Det er dermed sannsynlig at langvarig eksponering for lave nivåer av kvikksølv (urinverdier omkring 40 g/l) kan ha gitt synsskade hos tannhelsepersonell. Årsaken til at noen blir skadet og andre ikke, kan skyldes genetisk variasjon og forskjeller i eksponeringsnivå eller sårbarhet (4,14).…”

Section: Diskusjonunclassified