PT - JOURNAL ARTICLE AU - Went, L N AU - van Schooneveld, M J AU - Oosterhuis, J A TI - Late onset dominant cone dystrophy with early blue cone involvement. AID - 10.1136/jmg.29.5.295 DP - 1992 May 01 TA - Journal of Medical Genetics PG - 295--298 VI - 29 IP - 5 4099 - http://jmg.bmj.com/content/29/5/295.short 4100 - http://jmg.bmj.com/content/29/5/295.full SO - J Med Genet1992 May 01; 29 AB - A dominant cone dystrophy spanning seven generations was found in a pedigree from the Netherlands. The onset of the decline of visual acuity started after the age of 20, while a near complete absence of blue cone function (a so-called tritan defect) already existed before the presence of any ophthalmological abnormalities.