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【明報專訊】各種遺傳病中,色盲算是常見而又毋須多作處理的一種。養和醫院醫學遺傳科主任林德深指出,色盲對眼睛功能影響不嚴重,患者依然可以有正常視力,只是無法分辨部分顏色,生活上可能不便,例如衣服配搭會不小心撞色等。<\/p>\n 色盲有三大類,分別是紅綠色、藍黃色及全色盲,當中以紅綠色盲最為常見,成因是X染色體上兩個基因出現變異,影響眼底的視錐細胞運作,以致無法分辨紅綠兩色。至於藍黃色盲及全色盲都為顯性遺傳,並牽涉多組基因。<\/p>\n 華人發病率7% 男性較多<\/p>\n 林德深稱,色盲在華人的發病率約7%,男性患者較多,他見過患有色盲的同事,以「朱古力色領帶配泥黃色外套」,明顯在配衫襯色方面出了問題,但並無影響工作或其他表現,並笑指該名同事結婚後有人打理衣著,問題便迎刃而解。<\/p>\n 他說,色盲雖然常見,但就如該同事一樣,只是對日常生活構成不便,因此準父母不會亦毋須因此而做胎兒檢測。不過,對於一些會帶來嚴重及健康危害的遺傳病,就需要及早偵察和處理,例如唐氏綜合症及蠶豆症,前者可能要考慮終止懷孕,後者則要預防溶血帶來的併發症,如腦癱及貧血等。他表示,唐氏綜合症是產檢中的常規檢測,而本地初生嬰兒亦會接受蠶豆症普查,以及早發現患病。<\/p>\n