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目的 探讨缩瞳剂对瞳孔中心位置的影响及其在PRK和LASIK术中与激光切削中心偏移的关系。方法 对46例(92眼)拟行PRK和LASIK手术的近视眼患者以1％及2％硝酸匹罗卡品眼液点眼,在角膜地形图上自动测量缩瞳前后的角膜直径、瞳孔中心偏离角膜光学中心的方向和距离。结果 自然状态成年近视眼瞳孔直径为:水平径3.86(0.93mm,垂直径3.96(1.02mm。73.91％的瞳孔中心位于角膜光学中心的鼻上方,平均偏离0.22(0.10mm。1％或2％硝酸匹罗卡品眼液缩瞳后,瞳孔中心平均偏离0.16(0.05mm和0.20(0.10mm。瞳孔中心的象限分布比例与缩瞳前无明显差异。结论 缩瞳使瞳孔中心相对于角膜光学中心的偏离减少,有利于减少PRK和LASIK术中激光切削中心大多向鼻上方的偏移。缩瞳的实际意义在于便于手术中心的定位。
Objective To investigate the effect of miotic agent on the pupil center position and its relationship with laser cutting center offset in PRK and LASIK. Methods Forty-six patients (92 eyes) with myopia undergoing PRK and LASIK surgery were treated with 1% and 2% pilocarone nitrate eye drops, corneal diameter before and after miosis was measured on corneal topography, and pupil center deviation Corneal optical center of the direction and distance. Results Natural adult pupil diameter of myopia: horizontal diameter 3.86 (0.93mm, vertical diameter 3.96 (1.02mm.73.91% pupil center is located above the nasal optical center of the nose, the average deviation of 0.22 (0.10mm.1% or 2% nitric acid Pilocarpine eye drops after pupil center deviation from the average 0.16 (0.05mm and 0.20 (0.10mm. The pupil center of the quadrant distribution ratio and miosis before no significant difference.Conclusion miosis to pupil center relative to the optical center of the cornea Decreased deviation, help to reduce PRK and LASIK laser cutting center most of the shift to the nose above the actual meaning of miosis is to facilitate the positioning of the operation center.