不同镜片参数对人眼对比敏感度影响的研究

Research on Different Lens Parameters' Influence on Human Eyes' Contrast Sensitivity

目的:通过测量不同参数光学镜片的对比敏感度,了解各种参数对对比敏感度的影响,为人们选择光学镜片提供依据。方法:选择3组镜片:组1为同一厂家生产的折射率为1.533,色散系数为37.0,镜片度数分别为-1.50DS和-5.50 DS各30片镜片;组2为不同厂家生产的度数分别为-1.50 DS和-5.50 DS各30片镜片;组3为同一厂家生产的度数同为-3.50 DS各30片镜片,折射率和色散系数镜片不同。使用RM-800对比敏感度仪,采用空间光栅产生衍射条纹作为视标,通过改变条纹的空间频率,对比度以及方向来检查眼镜片的对比敏感度。结果:-1.50 DS近视镜片比-5.50 DS近视镜片对比敏感度好,国外名牌比国内一般牌子的对比敏感度好,同样度数高折射率比低折射率的对比敏感度好。结论:对比敏感度的检测结果,可以作为选择眼镜片的重要依据。

Purpose：This study measures the contrast sensitivity of different optical lens parameters and explores the influenc-es of different parameters on contrast sensitivity in order to provide a basis for people to choose suitable glasses. Methods：The lenses are divided into 3 groups according to different parameters. The refractive index of the lenses in Group 1 is 1.533. The dispersion coef-ficient is 37.0. The diopters are-1.50DS and-5.50DS respectively. The lenses in Group 2 are the ones from a different manufacturer, whose diopters are-1.50DS and-5.50DS. The lenses in Group 3 are made by the same manufacturers as Group 1, whose diopter is-3.50DS and they have different refractive index and dispersion coefficient. The lenses＇ contrast sensitivity are measured by the RM-800 contrast sensitivity instrument, which takes the diffraction stripes generated by spatial grating as the sighting mark and chang-es the stripes＇ spatial frequency, contrast, and orientation. Results：The contrast sensitivity of low myopia lenses is better than those of high myopia. The contrast sensitivity of famous foreign brands is better than domestic brands. The contrast sensitivity of high refrac-tive index lenses is better than those of low refractive index if they are with the same diopter. Conclusion：The results of contrast sensi-tivity test can be used as an important basis for selection of glasses.