用低功率CO2激光在兔眼做角膜热成形术籍以了解凝固点数目及中央视区大小与远视矫正效果的关系。结果显示CO2激光角膜热成形术在照射5mm视区时，能矫正低度远视。当视区小至一定程度时，仅使角膜中央扁平，而非变凸，且可引起不规则散光。病理观察发现热凝点呈换形，深达角膜的2／3，楔形区内胶原增生，相互交织成张力收缩，半年后渐呈平行规则排列，与远视矫正效果渐下降是一致的。 Low-power CO2 laser in the rabbit’s eye corneal thermoplasty membership to understand the number of coagulation points and the central visual field size and hyperopia correction effect. The results show that CO2 laser keratoplasty in the irradiation of 5mm visual field, can correct low myopia. When the viewing area is small to a certain extent, only the central cornea is flat, not convex, and can cause irregular astigmatism. Pathological observation found that the condensation point was transformed, deep 2/3 of the cornea, wedge-shaped area of ​​collagen hyperplasia, intertwined into tension contraction, six months gradually became parallel and regular arrangement, and myopia correction effect is gradually decreased.