Efficacy measures include axial length, keratometric power and mean absolute refractive error.
有效测量值包括眼轴长度，角膜曲率和绝对屈光误差值等内容。
With the increase of the periods and the absolute value of refractive index difference, the full width at half maximum of spectrum decreases.
介质折射率差的绝对值越大、周期数增加都使透射波谱宽度变窄。
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