高度近视的遗传
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<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 150%; TEXT-ALIGN: left; mso-pagination: widow-orphan" align=left><SPAN lang=EN-US style="FONT-SIZE: 9pt; LINE-HEIGHT: 150%; FONT-FAMILY: ˎ̥; mso-bidi-font-family: 宋体; mso-font-kerning: 0pt"><?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" /><o:p> </o:p></SPAN></P></TD></TR></TBODY></TABLE>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 150%; TEXT-ALIGN: left; mso-pagination: widow-orphan; mso-margin-top-alt: auto; mso-margin-bottom-alt: auto" align=left><SPAN style="FONT-SIZE: 9pt; LINE-HEIGHT: 150%; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-font-kerning: 0pt; mso-ascii-font-family: ˎ̥; mso-hansi-font-family: ˎ̥">高度近视是常染色体隐性遗传病，也就是有关近视的一对基因都是本病的致病基因才发病。如果只是其中一个基因是致病的，而另一个基因是正常的，则不发病，只是致病基因携带者。譬如父母亲都不是近视眼，但他们都是高度近视基因携带者，在他们本人不显示近视，但他们俩的致病基因遗传给孩子，使孩子具备了两个近视基因，故而使孩子成了近视眼。</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; LINE-HEIGHT: 150%; FONT-FAMILY: ˎ̥; mso-bidi-font-family: 宋体; mso-font-kerning: 0pt"><o:p></o:p></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 150%; TEXT-ALIGN: left; mso-pagination: widow-orphan; mso-margin-top-alt: auto; mso-margin-bottom-alt: auto" align=left><SPAN lang=EN-US style="FONT-SIZE: 9pt; LINE-HEIGHT: 150%; FONT-FAMILY: ˎ̥; mso-bidi-font-family: 宋体; mso-font-kerning: 0pt"> </SPAN><SPAN style="FONT-SIZE: 9pt; LINE-HEIGHT: 150%; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-font-kerning: 0pt; mso-ascii-font-family: ˎ̥; mso-hansi-font-family: ˎ̥">当自己是高度近视眼时，与高度近视眼</SPAN><SPAN style="FONT-SIZE: 9pt; LINE-HEIGHT: 150%; FONT-FAMILY: ˎ̥; mso-bidi-font-family: 宋体; mso-font-kerning: 0pt"> <SPAN lang=EN-US>(600</SPAN></SPAN><SPAN style="FONT-SIZE: 9pt; LINE-HEIGHT: 150%; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-font-kerning: 0pt; mso-ascii-font-family: ˎ̥; mso-hansi-font-family: ˎ̥">度以上者</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; LINE-HEIGHT: 150%; FONT-FAMILY: ˎ̥; mso-bidi-font-family: 宋体; mso-font-kerning: 0pt">)</SPAN><SPAN style="FONT-SIZE: 9pt; LINE-HEIGHT: 150%; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-font-kerning: 0pt; mso-ascii-font-family: ˎ̥; mso-hansi-font-family: ˎ̥">结合，子女发病的机会在</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; LINE-HEIGHT: 150%; FONT-FAMILY: ˎ̥; mso-bidi-font-family: 宋体; mso-font-kerning: 0pt">90%</SPAN><SPAN style="FONT-SIZE: 9pt; LINE-HEIGHT: 150%; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-font-kerning: 0pt; mso-ascii-font-family: ˎ̥; mso-hansi-font-family: ˎ̥">以上。如果与近视眼基因携带者结合，子女可能有半数是高度近视，而同正常视力或中低度近视者结合，子女发生近视眼的机会是</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; LINE-HEIGHT: 150%; FONT-FAMILY: ˎ̥; mso-bidi-font-family: 宋体; mso-font-kerning: 0pt">1/10</SPAN><SPAN style="FONT-SIZE: 9pt; LINE-HEIGHT: 150%; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-font-kerning: 0pt; mso-ascii-font-family: ˎ̥; mso-hansi-font-family: ˎ̥">。</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; LINE-HEIGHT: 150%; FONT-FAMILY: ˎ̥; mso-bidi-font-family: 宋体; mso-font-kerning: 0pt"><o:p></o:p></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 150%; TEXT-ALIGN: left; mso-pagination: widow-orphan; mso-margin-top-alt: auto; mso-margin-bottom-alt: auto" align=left><SPAN lang=EN-US style="FONT-SIZE: 9pt; LINE-HEIGHT: 150%; FONT-FAMILY: ˎ̥; mso-bidi-font-family: 宋体; mso-font-kerning: 0pt"> </SPAN><SPAN style="FONT-SIZE: 9pt; LINE-HEIGHT: 150%; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-font-kerning: 0pt; mso-ascii-font-family: ˎ̥; mso-hansi-font-family: ˎ̥">在我国一般人群中，约有</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; LINE-HEIGHT: 150%; FONT-FAMILY: ˎ̥; mso-bidi-font-family: 宋体; mso-font-kerning: 0pt">1/5</SPAN><SPAN style="FONT-SIZE: 9pt; LINE-HEIGHT: 150%; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-font-kerning: 0pt; mso-ascii-font-family: ˎ̥; mso-hansi-font-family: ˎ̥">是近视眼基因的携带者。</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; LINE-HEIGHT: 150%; FONT-FAMILY: ˎ̥; mso-bidi-font-family: 宋体; mso-font-kerning: 0pt"><o:p></o:p></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 150%; TEXT-ALIGN: left; mso-pagination: widow-orphan; mso-margin-top-alt: auto; mso-margin-bottom-alt: auto" align=left><SPAN lang=EN-US style="FONT-SIZE: 9pt; LINE-HEIGHT: 150%; FONT-FAMILY: ˎ̥; mso-bidi-font-family: 宋体; mso-font-kerning: 0pt"> </SPAN><SPAN style="FONT-SIZE: 9pt; LINE-HEIGHT: 150%; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-font-kerning: 0pt; mso-ascii-font-family: ˎ̥; mso-hansi-font-family: ˎ̥">不过，患有高度近视者，也不必过分悲观，多数在佩戴眼镜后可获得较好视力。此外，在营养和眼睛卫生方面多加注意，度数是不会再加深的。</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; LINE-HEIGHT: 150%; FONT-FAMILY: ˎ̥; mso-bidi-font-family: 宋体; mso-font-kerning: 0pt"><o:p></o:p></SPAN></P></TD></TR></TBODY></TABLE></DIV>
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