凹透镜诱导鸡眼屈光变化的研究

Studies on Refractive Changes in Chickens with Myopia Induced by Concave Lenses

目的研究梯度凹透镜及形觉剥夺诱导鸡眼的屈光变化。方法小鸡孵化后第2天单眼分别戴-5D,-10D及-20D凹透镜或以半透明眼罩遮盖,三周后测定眼轴长度及屈光度。结果各组实验眼均呈近视改变,眼轴延长较对照眼显著。-5D及-10D组,实验眼的近视屈光度与所戴凹透镜的度数相接近,-20D组实验眼的近视屈光度及眼轴长度与形觉剥夺组相近。结论凹透镜离焦可改变新生小鸡眼轴生长状态,诱导新生小鸡产生近视眼,鸡眼在一定范围内可以较完全地代偿凹透镜的离焦效应。

Purpose To study the refractive changes in chickens with myopia induced by concave lenses of different dipoter and form deprivation. Methods 2-day-old chickens wore monocular concave lenses of - 5D, - 10D, - 20D and translucent occluders. Three weeks later, refraction was determined by streak retinoscopy and axial length was measured by A-scan. Results All experimental eyes showed myopia. The magnitude of the myopia almost approached the power of the lenses applied in - 5D and - 10D groups. The - 20D lenses caused similar amout of myopia as that of occluders. The axial length in all experimental eyes was longer, compared with the control eyes. Conclusion Concave lenses could alter eye growth and refractive status of chickens. Optical defocus imposed by concave lenses could be completely compensated by chickens in a limited range.